<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"></div><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Whether these heat factors should or must be taken into account are two different issues. From a performance standpoint and to reduce service issues, it might be wise to increase wire size to account for heat in an enclosure. But from an NEC standpoint, that&#39;s not required. For example, nobody I know derates #12 Romex in a 140º attic for a 20A circuit and uses #10 instead. Similarly, we aren&#39;t tasked with guessing what the temperature might be within a raceway (except on rooftops) or inside enclosures. </div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Heck, the 75º conductor rating tops out in the temperature correction table at 158ºF. I&#39;m willing to bet that temperature is achievable inside a disconnect switch in Florida, in which case there would be NO conductor size allowable for use in this circumstance if the terminals are 75ºF rated.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">With HD fusible disconnects substantially more expensive, the performance question becomes important. I plan to start looking closely at where these disconnects will be mounted and what contributing factors there are with respect to internal temperature.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><table border="0" cellpadding="0" cellspacing="0" style="font-family:&quot;helvetica neue&quot;,helvetica,arial,sans-serif"><tbody></tbody></table><b><div style="text-align:center"><br></div></b></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Nov 19, 2020 at 3:39 PM Ray &lt;<a href="mailto:ray@solarray.com">ray@solarray.com</a>&gt; wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
  
    
  
  <div>
    <p>114F was just the temperature where the derate in the NEC goes
      below the continuous amps rating.  I had no idea what the
      temperatures actually were.  Normally I do just as you did, and
      figure ambient temperature based on AHSRAE.  However another read
      of that part of the code seems to indicate it would be the highest
      air temperature the conductor would be exposed to.  So the section
      of wiring in the attic at 140 F should be designed for that. 
      There is an exemption if its less than 10% of the total circuit,
      though.  <br>
    </p>
    <p>This is yet another thing I haven&#39;t been really paying enough
      attention to, but now that someone else is having issues, its
      probably time to include even more strenuous temperature
      derating.  How, for instance, would we calculate the temperature
      inside that disconnect box when its in the sun?  and it would
      depend on the color.....<br>
    </p>
    <pre cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
    <div>On 11/19/20 8:48 AM, Jason Szumlanski
      wrote:<br>
    </div>
    <blockquote type="cite">
      
      <div dir="ltr">
        <div dir="ltr">
          <div style="font-family:arial,helvetica,sans-serif">All good
            info.</div>
          <div style="font-family:arial,helvetica,sans-serif"><br>
          </div>
          <div style="font-family:arial,helvetica,sans-serif">I plan to
            take my FLIR One out next time. I can paint it white in both
            cases I suppose. </div>
          <div style="font-family:arial,helvetica,sans-serif"><br>
          </div>
          <div style="font-family:arial,helvetica,sans-serif">As for the
            temps, the high ambient here is 93ºF per ASHRAE. Inside
            attics, we can see temps exceeding 140ºF here. We don&#39;t
            derate conductors for that. I&#39;m not sure where 114ºF comes
            from, but I get the point. The interior of the enclosure can
            certainly get blazing hot. This definitely seems to be a
            heat-related issue whether the NEC intent has been met or
            not. Upping the tap conductors to #4 or larger would not be
            difficult or expensive to accomplish. I will likely make
            that our new standard for 50A and 60A calculated circuits
            for supply-side interconnections made outdoors.</div>
          <div style="font-family:arial,helvetica,sans-serif"><br>
          </div>
          <div style="font-family:arial,helvetica,sans-serif">Jason</div>
          <div style="font-family:arial,helvetica,sans-serif"><br>
          </div>
        </div>
        <br>
        <div class="gmail_quote">
          <div dir="ltr" class="gmail_attr">On Wed, Nov 18, 2020 at 8:13
            PM Ray &lt;<a href="mailto:ray@solarray.com" target="_blank">ray@solarray.com</a>&gt; wrote:<br>
          </div>
          <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
            <div>
              <p>What is the brand and model of the disconnect? Temp
                ratings of the terminals?  I&#39;ve definitely had fuse
                holders not make good contact with the fuses and burn
                the fuses at one end, instead of in the middle.  Have
                you looked at it with a Thermal imaging camera when its
                operating to see if its hot on one end of the fuse?  <br>
              </p>
              <p>Second, depending on the temperature it would be
                hitting inside the enclosure in the sun, you could be
                exceeding the rating of the #6 conductor.  Assuming
                terminals rated at 75C, then from 310.16, a #6 is rated
                65 A, but derate for temperature of 114F inside the
                enclosure gets you to .82 x 65 = 53.3, which is a bit
                less than the 54.45 that Dave just calculated for
                continuous duty.  <br>
              </p>
              <p>What color is the disconnect painted?  any chance of
                painting it white?<br>
              </p>
              <pre cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
              <div>On 11/18/20 4:16 PM, Dave Tedeyan wrote:<br>
              </div>
              <blockquote type="cite">
                <div dir="ltr">Jason, 
                  <div>Bright sunny days, disconnect on the west side of
                    house, maybe in the sun? 43.56A * 1.25 for
                    continuous duty = 54.45A. If these disconnects are
                    also baking in the sun, maybe the extra ambient heat
                    is enough to push it over the edge? Just a thought.</div>
                  <div>Cheers,</div>
                  <div>Dave<br clear="all">
                    <div>
                      <div dir="ltr">
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                                                  <div><br>
                                                  </div>
                                                  <div><b><font face="tahoma,
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                                                        Tedeyan, PE</font></b></div>
                                                  <div><font face="tahoma,
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                <br>
                <div class="gmail_quote">
                  <div dir="ltr" class="gmail_attr">On Wed, Nov 18, 2020
                    at 3:41 PM Jay &lt;<a href="mailto:jay.peltz@gmail.com" target="_blank">jay.peltz@gmail.com</a>&gt;
                    wrote:<br>
                  </div>
                  <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                    <div dir="auto">
                      <div dir="ltr">Hi Jason</div>
                      <div dir="ltr"><br>
                      </div>
                      <div dir="ltr">Any chance for some photos?</div>
                      <div dir="ltr"><br>
                      </div>
                      <div dir="ltr">Jay</div>
                      <div dir="ltr"><br>
                        <blockquote type="cite">On Nov 18, 2020, at
                          12:18 PM, Jason Szumlanski &lt;<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>&gt;
                          wrote:<br>
                          <br>
                        </blockquote>
                      </div>
                      <blockquote type="cite">
                        <div dir="ltr">\ufeff
                          <div dir="ltr">
                            <div dir="ltr">
                              <div style="font-family:arial,helvetica,sans-serif">The
                                plot thickens on the fuse blowing issue.
                                Again, we tore the Enphase IQ system
                                apart looking for any reason for the
                                fuse to keep blowing. We reconfirmed
                                torque on all line side conductors to
                                the service (supply side interconnection
                                using Polaris taps).</div>
                              <div style="font-family:arial,helvetica,sans-serif"><br>
                              </div>
                              <div style="font-family:arial,helvetica,sans-serif">Low
                                and behold, I get a second client with
                                the exact same issue yesterday. The
                                circumstances are eerily alike. Both
                                disconnects are located on the west side
                                of the house and have 36 IQ7+
                                microinverters on an IQ
                                Combiner, requiring 60A fuses on the 60A
                                fusible disconnect. The combined
                                inverter output rating is 43.56A. The
                                interconnections are identical with #6
                                THHN 90ºC conductors and Polaris taps.
                                Both disconnects have conductors on the
                                right-hand side line-side terminal that
                                are discolored (the copper is silvery,
                                the insulation is not burned). The fuses
                                blow at peak current around 1:30 pm,
                                only on bright and sunny days.</div>
                              <div style="font-family:arial,helvetica,sans-serif"><br>
                              </div>
                              <div style="font-family:arial,helvetica,sans-serif">I&#39;m
                                starting to suspect a faulty fusible
                                disconnect switch. Maybe the blades are
                                not making proper contact with the line
                                side terminals.</div>
                              <div style="font-family:arial,helvetica,sans-serif"><br>
                              </div>
                              <div style="font-family:arial,helvetica,sans-serif">For
                                the client who is having
                                regular/frequent fuses blowing I plan to
                                replace the disconnect with a heavy-duty
                                version or possibly get a 100A
                                disconnect with fuse reducers. I&#39;m not
                                sure which option would yield a better
                                test. I might also switch brands.</div>
                              <div style="font-family:arial,helvetica,sans-serif"><br>
                              </div>
                              <div style="font-family:arial,helvetica,sans-serif">Currently,
                                we are using GE TG3222R. The fuses are
                                Bussman FRN-R Time Delay. I have to
                                believe a heavy-duty switch would be
                                less susceptible to this, but maybe a
                                higher rated one would be a better
                                option. I&#39;m not a fan of fuse reducers,
                                however. </div>
                              <div style="font-family:arial,helvetica,sans-serif"><br>
                              </div>
                              <div style="font-family:arial,helvetica,sans-serif">Jason
                                Szumlanski</div>
                              <div style="font-family:arial,helvetica,sans-serif">Florida
                                Solar Design Group</div>
                              <div style="font-family:arial,helvetica,sans-serif"><br>
                              </div>
                            </div>
                            <br>
                            <div class="gmail_quote">
                              <div dir="ltr" class="gmail_attr">On Sun,
                                Aug 30, 2020 at 5:54 PM Jason Szumlanski
                                &lt;<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>&gt;
                                wrote:<br>
                              </div>
                              <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                <div dir="ltr">
                                  <div dir="ltr">
                                    <div style="font-family:arial,helvetica,sans-serif">The
                                      tripping breaker occurred at
                                      random times, even at night. No
                                      weather-related correlation.</div>
                                    <div style="font-family:arial,helvetica,sans-serif"><br>
                                    </div>
                                    <div style="font-family:arial,helvetica,sans-serif">I
                                      have more research to do to see
                                      when this fuse issue is
                                      happening, but previous visits
                                      showed no water ingress. I&#39;m not
                                      sure about temperature.</div>
                                    <div style="font-family:arial,helvetica,sans-serif"><br>
                                    </div>
                                    <div>
                                      <div dir="ltr">
                                        <div dir="ltr">
                                          <div>
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                                                  <div dir="ltr">
                                                    <div dir="ltr"><b>
                                                        <div style="text-align:center"><br>
                                                        </div>
                                                      </b></div>
                                                  </div>
                                                </div>
                                              </div>
                                            </div>
                                          </div>
                                        </div>
                                      </div>
                                    </div>
                                    <br>
                                  </div>
                                  <br>
                                  <div class="gmail_quote">
                                    <div dir="ltr" class="gmail_attr">On
                                      Thu, Aug 27, 2020 at 8:51 PM Jay
                                      &lt;<a href="mailto:jay.peltz@gmail.com" target="_blank">jay.peltz@gmail.com</a>&gt;
                                      wrote:<br>
                                    </div>
                                    <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                      <div dir="auto">
                                        <div dir="ltr">Hi Jason</div>
                                        <div dir="ltr"><br>
                                        </div>
                                        <div dir="ltr">One thought I
                                          have about the blowing fuse is
                                          to check it with a IR tool. </div>
                                        <div dir="ltr"><br>
                                        </div>
                                        <div dir="ltr">I suspect a poor
                                          connection of the fuse to
                                          holder which during higher air
                                          temp is causing it to fail.  </div>
                                        <div dir="ltr">I\u2019m assuming that
                                          the correct amp size and slow
                                          blow fuse Is installed and
                                          that the wire connections are
                                          done correctly. But again an
                                          IR tool during peak heat would
                                          be  a good test. </div>
                                        <div dir="ltr"><br>
                                        </div>
                                        <div dir="ltr">About the enphase
                                          fix, wow what a head
                                          scratcher. But given that it\u2019s
                                          fixed it means that it\u2019s not a
                                          short, but enough amps going
                                          through over enough time to
                                          trip it. I wonder if a
                                          magnetic hydraulic vs thermal
                                          breaker ( CBI  vs CH etc)
                                          would have worked?</div>
                                        <div dir="ltr"><br>
                                        </div>
                                        <div dir="ltr">Is that breaker
                                          box ever in the sun?  Is there
                                          any Correlation between  high
                                          ambient temperatures and
                                          tripping?  </div>
                                        <div dir="ltr"><br>
                                        </div>
                                        <div dir="ltr">It sure would
                                          keep me up at night too </div>
                                        <div dir="ltr"><br>
                                        </div>
                                        <div dir="ltr">Jay</div>
                                        <div dir="ltr"><br>
                                        </div>
                                        <div dir="ltr"><br>
                                          <blockquote type="cite">On Aug
                                            27, 2020, at 4:29 PM, Jason
                                            Szumlanski &lt;<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>&gt;
                                            wrote:<br>
                                            <br>
                                          </blockquote>
                                        </div>
                                        <blockquote type="cite">
                                          <div dir="ltr">\ufeff
                                            <div dir="auto">
                                              <div>So the resolution to
                                                this is in... But I
                                                still have no idea what
                                                was wrong. </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto">The string
                                                of 10 offending
                                                microinverters was split
                                                into 5 and 5. We had a
                                                spare breaker in the IQ
                                                Combiner so it was
                                                relatively easy to run
                                                another branch circuit.
                                                It has been over two
                                                months with no
                                                recurrence. So the issue
                                                seems to be resolved,
                                                but again, no idea why.</div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto">So here we
                                                go again... On another
                                                system we have a similar
                                                problem now. In this
                                                case it is supply side
                                                interconnected with a
                                                fusible disconnect. The
                                                same fuse (same line)
                                                keeps blowing every few
                                                to several weeks. We
                                                can&#39;t find any home run
                                                wiring issues or issues
                                                with terminator caps.
                                                There are no apparent
                                                faults in the AC
                                                Combiner. We have no
                                                idea why this is
                                                happening. But in this
                                                system, just the fuse
                                                blows, not one of the
                                                individual branch
                                                circuit breakers. </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto">This is
                                                getting very
                                                frustrating. And this is
                                                way more serious because
                                                fuses and service calls
                                                are expensive and I
                                                can&#39;t isolate the issue
                                                to one branch circuit. I
                                                don&#39;t even know where to
                                                start. Leaving each
                                                circuit disconnected for
                                                several weeks to prove a
                                                negative is an untenable
                                                suggestion to make to a
                                                client. But I don&#39;t see
                                                any other good options. </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto">Jason
                                                Szumlanski </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                              </div>
                                              <div dir="auto"><br>
                                                <br>
                                                <div class="gmail_quote" dir="auto">
                                                  <div dir="ltr" class="gmail_attr">On
                                                    Tue, Jun 9, 2020,
                                                    3:42 PM Jason
                                                    Szumlanski &lt;<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>&gt;
                                                    wrote:<br>
                                                  </div>
                                                  <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                    <div dir="ltr">
                                                      <div dir="ltr">
                                                        <div style="font-family:arial,helvetica,sans-serif">Yes,
                                                          we
                                                          double-checked
                                                          that. I have
                                                          seen that
                                                          happen before
                                                          and it&#39;s one
                                                          of my early
                                                          diagnostic
                                                          steps for
                                                          something like
                                                          this.</div>
                                                        <div style="font-family:arial,helvetica,sans-serif"><br>
                                                        </div>
                                                        <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <table cellspacing="0" cellpadding="0" border="0">
                                                          <tbody>
                                                          </tbody>
                                                          </table>
                                                          <b>
                                                          <div style="text-align:center"><br>
                                                          </div>
                                                          </b></div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                        </div>
                                                        <br>
                                                      </div>
                                                      <br>
                                                      <div class="gmail_quote">
                                                        <div dir="ltr" class="gmail_attr">On
                                                          Tue, Jun 9,
                                                          2020 at 9:18
                                                          AM Mac Lewis
                                                          &lt;<a href="mailto:maclewis1@gmail.com" rel="noreferrer" target="_blank">maclewis1@gmail.com</a>&gt;
                                                          wrote:<br>
                                                        </div>
                                                        <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div dir="ltr">Hi
                                                          Jason,
                                                          <div><br>
                                                          </div>
                                                          <div>Are you
                                                          certain that
                                                          the branch
                                                          circuits
                                                          aren&#39;t
                                                          crisscrossed
                                                          somewhere,
                                                          meaning that
                                                          an L1 branch
                                                          1, isn&#39;t
                                                          connected to
                                                          an L2 branch
                                                          2?  That could
                                                          explain two
                                                          different
                                                          breakers
                                                          tripping.  </div>
                                                          <div><br>
                                                          </div>
                                                          <div>Good luck</div>
                                                          <div><br>
                                                          </div>
                                                          </div>
                                                          <br>
                                                          <div class="gmail_quote">
                                                          <div dir="ltr" class="gmail_attr">On Wed, Jun 3, 2020 at 1:07 PM Jason Szumlanski &lt;<a href="mailto:jason@floridasolardesigngroup.com" rel="noreferrer" target="_blank">jason@floridasolardesigngroup.com</a>&gt; wrote:<br>
                                                          </div>
                                                          <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div style="font-family:arial,helvetica,sans-serif">Undoubtedly,
                                                          the
                                                          termination
                                                          caps are the
                                                          second thing
                                                          we check after
                                                          the rooftop
                                                          junction box(es).
                                                          These are
                                                          prone to
                                                          installation
                                                          errors, even
                                                          when the right
                                                          parts are
                                                          used. And
                                                          given the
                                                          cost, I&#39;ve
                                                          thought very
                                                          long and hard
                                                          about
                                                          abandoning
                                                          them
                                                          altogether and
                                                          terminating
                                                          strings in
                                                          small j-boxes
                                                          with
                                                          watertight
                                                          fittings. But
                                                          in this case,
                                                          there was no
                                                          evidence of
                                                          improper
                                                          installation
                                                          (we replaced
                                                          them) and it
                                                          was not
                                                          correlated to
                                                          rain events.</div>
                                                          <div style="font-family:arial,helvetica,sans-serif"><br>
                                                          </div>
                                                          <div style="font-family:arial,helvetica,sans-serif">We
                                                          are well
                                                          equipped with
                                                          bare Q-cable
                                                          and field
                                                          wireables that
                                                          we could use
                                                          for
                                                          troubleshooting
                                                          to bypass
                                                          certain
                                                          sections, but
                                                          the
                                                          intermittent
                                                          nature of the
                                                          problem and
                                                          unpredictable
                                                          timeframe
                                                          between faults
                                                          is very
                                                          frustrating.
                                                          While this is
                                                          a
                                                          rare occurrence,
                                                          it is
                                                          definitely a
                                                          &quot;con&quot; to
                                                          consider when
                                                          comparing
                                                          string vs.
                                                          microinverters
                                                          that I had not
                                                          strongly
                                                          considered in
                                                          the past. I&#39;m
                                                          intent on
                                                          getting to the
                                                          bottom of this
                                                          in order to
                                                          learn what to
                                                          look for in
                                                          the future and
                                                          how to
                                                          approach
                                                          diagnoses of
                                                          Enphase
                                                          branch circuit faults.</div>
                                                          <div style="font-family:arial,helvetica,sans-serif"><br>
                                                          </div>
                                                          <div style="font-family:arial,helvetica,sans-serif">Jason</div>
                                                          <div style="font-family:arial,helvetica,sans-serif"><br>
                                                          </div>
                                                          <div style="font-family:arial,helvetica,sans-serif"><br>
                                                          </div>
                                                          <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <table cellspacing="0" cellpadding="0" border="0">
                                                          <tbody>
                                                          </tbody>
                                                          </table>
                                                          <b>
                                                          <div style="text-align:center"><br>
                                                          </div>
                                                          </b></div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          <br>
                                                          </div>
                                                          <br>
                                                          <div class="gmail_quote">
                                                          <div dir="ltr" class="gmail_attr">On Wed, Jun 3, 2020 at 2:31 PM Amos Post &lt;<a href="mailto:integrityenergy101@gmail.com" rel="noreferrer" target="_blank">integrityenergy101@gmail.com</a>&gt;
                                                          wrote:<br>
                                                          </div>
                                                          <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div>I was
                                                          just at a site
                                                          last week
                                                          where the
                                                          Enphase branch
                                                          circuit
                                                          breaker,
                                                          outside
                                                          utility
                                                          disconnect
                                                          breaker, and
                                                          feed breaker
                                                          in the main
                                                          panel all
                                                          tripped
                                                          simultaneously,
                                                          and it
                                                          happened about
                                                          1 hour before
                                                          I showed up
                                                          onsite.  The
                                                          customer said
                                                          it had
                                                          happened 1
                                                          other time
                                                          last fall but
                                                          that time it
                                                          was just the 1
                                                          branch circuit
                                                          in the Enphase
                                                          combiner
                                                          panel. 
                                                          Interestingly
                                                          the customer
                                                          mentioned that
                                                          he had just
                                                          washed off the
                                                          panels, also
                                                          about 1 hour
                                                          before I got
                                                          there.  I went
                                                          on the roof
                                                          and found that
                                                          the installing
                                                          contractor had
                                                          not put on the
                                                          Enphase
                                                          termination
                                                          caps.  1
                                                          string was
                                                          wire-nutted
                                                          with regular
                                                          wire nuts and
                                                          sitting on the
                                                          roof, and the
                                                          roof was damp
                                                          right there.
                                                          This was a
                                                          fairly flat
                                                          roof.  The
                                                          other micro
                                                          trunk cable
                                                          was just cut
                                                          with no
                                                          protection at
                                                          all, tied to
                                                          the rail\u2026
                                                          <div><br>
                                                          </div>
                                                          <div><br>
                                                          <div> <span>
                                                          <div>&lt;IE
                                                          LOGO
                                                          150x78.jpg&gt;</div>
                                                          </span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0)">
                                                          <br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0)">
                                                          <span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0);float:none;display:inline"> 
                                                               Amos Post</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0)">
                                                          <span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0);float:none;display:inline"> 
                                                           </span><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0);float:none;display:inline">Integrity
                                                          Energy</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0)">
                                                          <span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0);float:none;display:inline"> 
                                                          W 802.763.7023</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0)">
                                                          <span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0);float:none;display:inline"> 
                                                           C
                                                          802.291.2188</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0)">
                                                          <span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0);float:none;display:inline"> 
                                                            </span><a href="https://mailtrack.io/trace/link/dc66cdeaf404328fbb705e2e72f2484be94812bd?url=http%3A%2F%2Fwww.ienergyvt.com&amp;userId=1613865&amp;signature=19910e164fbeee17" style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" rel="noreferrer" target="_blank"><span style="text-decoration:none;color:rgb(0,0,0)">ienergyVT.com</span></a>
                                                          <div style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;color:rgb(0,0,0)"> 
                                                                <a href="https://mailtrack.io/trace/link/3fbedb2bd4b275e1921293919044ef45869f0285?url=https%3A%2F%2Fwww.facebook.com%2Fintegrityenergyllp%3Fref%3Dhl&amp;userId=1613865&amp;signature=3c1cd8d1bdc6cfcc" rel="noreferrer" target="_blank">Facebook</a></div>
                                                          </div>
                                                          <div><br>
                                                          <blockquote type="cite">
                                                          <div>On Jun 3,
                                                          2020, at 2:05
                                                          PM, Jason
                                                          Szumlanski
                                                          &lt;<a href="mailto:jason@floridasolardesigngroup.com" rel="noreferrer" target="_blank">jason@floridasolardesigngroup.com</a>&gt;
                                                          wrote:</div>
                                                          <br>
                                                          <div>
                                                          <div dir="ltr" style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none">
                                                          <div dir="ltr">
                                                          <div style="font-family:arial,helvetica,sans-serif">The
                                                          breaker in the
                                                          main panel IS
                                                          tripping
                                                          simultaneously
                                                          with one of
                                                          the branch
                                                          circuit
                                                          breakers each
                                                          time.</div>
                                                          <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr"><b>
                                                          <div style="text-align:center"><br>
                                                          </div>
                                                          <div style="text-align:center"><br>
                                                          </div>
                                                          <div style="text-align:center"><br>
                                                          </div>
                                                          <div style="text-align:center"><br>
                                                          </div>
                                                          </b></div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          <br>
                                                          </div>
                                                          <br>
                                                          <div class="gmail_quote">
                                                          <div dir="ltr" class="gmail_attr">On Wed, Jun 3, 2020 at 12:43 PM Jay &lt;<a href="mailto:jay.peltz@gmail.com" rel="noreferrer" target="_blank">jay.peltz@gmail.com</a>&gt;
                                                          wrote:<br>
                                                          </div>
                                                          <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div dir="auto">
                                                          <div dir="ltr">A
                                                          question that
                                                          keeps nagging
                                                          me is why do
                                                          these breakers
                                                          trip and not
                                                          the breaker in
                                                          the main
                                                          panel?  </div>
                                                          <div dir="ltr">Presuming
                                                          there is a 40
                                                          amp in the
                                                          main</div>
                                                          <div dir="ltr"><br>
                                                          </div>
                                                          <div dir="ltr">I
                                                          would have
                                                          thought that
                                                          given all the
                                                          times the
                                                          breakers have
                                                          tripped at
                                                          some point
                                                          that one would
                                                          have tripped
                                                          and I can\u2019t
                                                          understand why
                                                          not?  </div>
                                                          <div dir="ltr"><br>
                                                          </div>
                                                          <div dir="ltr">Jay </div>
                                                          <div dir="ltr"><br>
                                                          <blockquote type="cite">On
                                                          Jun 3, 2020,
                                                          at 8:27 AM,
                                                          Jerry Shafer
                                                          &lt;<a href="mailto:jerrysgarage01@gmail.com" rel="noreferrer" target="_blank">jerrysgarage01@gmail.com</a>&gt;
                                                          wrote:<br>
                                                          <br>
                                                          </blockquote>
                                                          </div>
                                                          <blockquote type="cite">
                                                          <div dir="ltr">\ufeff
                                                          <div dir="auto">Wrenches
                                                          <div dir="auto">Looking
                                                          g at the
                                                          bigger breaker
                                                          tripping at
                                                          the same time
                                                          is very likely
                                                          do to response
                                                          time of the
                                                          breaker
                                                          nothing more.
                                                          As l suggested
                                                          in a previous
                                                          message. Use a
                                                          non bridged
                                                          breaker to see
                                                          if it is one
                                                          or both legs
                                                          that trip.
                                                          Also an eguage
                                                          will help to
                                                          see what if
                                                          anything leads
                                                          up to the
                                                          failure and
                                                          when. </div>
                                                          <div dir="auto">Jerry</div>
                                                          <div dir="auto">Jerry</div>
                                                          </div>
                                                          <br>
                                                          <div class="gmail_quote">
                                                          <div dir="ltr" class="gmail_attr">On Wed, Jun 3, 2020, 7:58 AM Jason Szumlanski &lt;<a href="mailto:jason@floridasolardesigngroup.com" rel="noreferrer" target="_blank">jason@floridasolardesigngroup.com</a>&gt; wrote:<br>
                                                          </div>
                                                          <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div style="font-family:arial,helvetica,sans-serif">I
                                                          wonder about
                                                          that. Of
                                                          course, it
                                                          could be the
                                                          &quot;inverter
                                                          output
                                                          circuit&quot;
                                                          having a fault
                                                          in the wiring
                                                          still (an
                                                          intermittent
                                                          issue
                                                          somewhere
                                                          within the IQ
                                                          cable or home
                                                          run wiring).
                                                          But internal
                                                          to the
                                                          microinverter,
                                                          is it possible
                                                          that a fault
                                                          could still
                                                          occur at
                                                          night? I had a
                                                          suggestion
                                                          from another
                                                          wrench that
                                                          there are film
                                                          capacitors on
                                                          the AC output
                                                          side, but are
                                                          these isolated
                                                          when there is
                                                          no DC input?
                                                          It seems
                                                          unlikely that
                                                          this would be
                                                          an issue, but
                                                          I have seen
                                                          microinverters
                                                          reporting a
                                                          couple of
                                                          watts at night
                                                          (in
                                                          Enlighten).
                                                          I&#39;m not sure
                                                          how real that
                                                          is.</div>
                                                          <div style="font-family:arial,helvetica,sans-serif"><br>
                                                          </div>
                                                          <div style="font-family:arial,helvetica,sans-serif">The
                                                          overriding
                                                          question I
                                                          have is what
                                                          kind of fault
                                                          would cause
                                                          BOTH a branch
                                                          circuit and
                                                          the main solar
                                                          breaker to
                                                          trip
                                                          simultaneously?
                                                          That seems odd
                                                          to me. If any
                                                          normal load
                                                          branch circuit
                                                          has a fault,
                                                          you don&#39;t
                                                          often see
                                                          premises main
                                                          breakers
                                                          tripping, or
                                                          even feeder
                                                          circuit
                                                          breakers.</div>
                                                          <div style="font-family:arial,helvetica,sans-serif"><br>
                                                          </div>
                                                          <div style="font-family:arial,helvetica,sans-serif">I
                                                          got to
                                                          thinking that
                                                          maybe there is
                                                          some kind of
                                                          issue between
                                                          the BR220 and
                                                          CH240 breakers
                                                          not playing
                                                          nicely
                                                          together. But
                                                          I would think
                                                          this would be
                                                          a well-known
                                                          issue because
                                                          I&#39;m sure there
                                                          are tons of CH
                                                          feeder
                                                          breakers in
                                                          the wild with
                                                          BR branch
                                                          circuits
                                                          downstream. </div>
                                                          <div style="font-family:arial,helvetica,sans-serif"><br>
                                                          </div>
                                                          <div style="font-family:arial,helvetica,sans-serif"><br>
                                                          </div>
                                                          </div>
                                                          <br>
                                                          <div class="gmail_quote">
                                                          <div dir="ltr" class="gmail_attr">On Tue, Jun 2, 2020 at 9:25 AM &lt;<a href="mailto:drake.chamberlin@redwoodalliance.org" rel="noreferrer noreferrer" target="_blank">drake.chamberlin@redwoodalliance.org</a>&gt;
                                                          wrote:<br>
                                                          </div>
                                                          <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div style="font-size:10pt;font-family:Verdana,Geneva,sans-serif">
                                                          <p>If it trips
                                                          at night, we
                                                          know it is not
                                                          the output
                                                          from the
                                                          inverters
                                                          causing the
                                                          tripping. The
                                                          current must
                                                          be coming from
                                                          the grid.</p>
                                                          <div id="gmail-m_7042822723147726617gmail-m_-2761567396801542873gmail-m_-2069723750582363717gmail-m_-543445923422717358gmail-m_1044478832390607594m_2649556500485342876gmail-m_9219180041338812497gmail-m_-2593835731601265847gmail-m_-2056581339762963638gmail-m_-4394409340153391165m_-7145948492847024444gmail-m_-6641809747008533802signature">---<br>
                                                          <div style="margin:0px;padding:0px;font-family:monospace"> </div>
                                                          </div>
                                                          <p><br>
                                                          </p>
                                                          <p id="gmail-m_7042822723147726617gmail-m_-2761567396801542873gmail-m_-2069723750582363717gmail-m_-543445923422717358gmail-m_1044478832390607594m_2649556500485342876gmail-m_9219180041338812497gmail-m_-2593835731601265847gmail-m_-2056581339762963638gmail-m_-4394409340153391165m_-7145948492847024444gmail-m_-6641809747008533802reply-intro">On
                                                          2020-06-01
                                                          12:05, Jason
                                                          Szumlanski
                                                          wrote:</p>
                                                          <blockquote type="cite" style="padding:0px 0.4em;border-left:2px solid rgb(16,16,255);margin:0px">
                                                          <div id="gmail-m_7042822723147726617gmail-m_-2761567396801542873gmail-m_-2069723750582363717gmail-m_-543445923422717358gmail-m_1044478832390607594m_2649556500485342876gmail-m_9219180041338812497gmail-m_-2593835731601265847gmail-m_-2056581339762963638gmail-m_-4394409340153391165m_-7145948492847024444gmail-m_-6641809747008533802replybody1">
                                                          <div dir="ltr">
                                                          <div style="font-family:arial,helvetica,sans-serif"> </div>
                                                          <div dir="ltr">
                                                          <div style="font-family:arial,helvetica,sans-serif">It&#39;s
                                                          not weather.
                                                          It&#39;s at all
                                                          times of the
                                                          day and night,
                                                          and I
                                                          confirmed that
                                                          there is no
                                                          correlation to
                                                          rain or high
                                                          winds. That
                                                          was my first
                                                          suspicion.</div>
                                                          <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div style="text-align:center"> </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          <br>
                                                          <div>
                                                          <div dir="ltr">On
                                                          Mon, Jun 1,
                                                          2020 at 10:27
                                                          AM Ray &lt;<a href="mailto:ray@solarray.com" rel="noreferrer noreferrer noreferrer" target="_blank">ray@solarray.com</a>&gt; wrote:</div>
                                                          <blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div>
                                                          <p>Is it at
                                                          all weather
                                                          related? 
                                                          Rain, or high
                                                          humidity? 
                                                          High
                                                          temperatures? 
                                                          Do you have
                                                          any indication
                                                          what time of
                                                          day it trips
                                                          off at?</p>
                                                          <pre>Ray Walters
Remote Solar
303 505-8760</pre>
                                                          <div>On 6/1/20
                                                          10:23 AM,
                                                          Jason
                                                          Szumlanski
                                                          wrote:</div>
                                                          <blockquote type="cite" style="padding:0px 0.4em;border-left:2px solid rgb(16,16,255);margin:0px">
                                                          <div dir="auto">Well,
                                                          that didn&#39;t
                                                          resolve it.
                                                          The main
                                                          breaker and a
                                                          branch circuit
                                                          breaker
                                                          tripped again
                                                          a few days
                                                          ago. It was
                                                          the same
                                                          branch this
                                                          time. 
                                                          <div dir="auto"> </div>
                                                          <div dir="auto">As
                                                          my next
                                                          diagnostic
                                                          step I swapped
                                                          two circuits
                                                          (on which
                                                          breaker they
                                                          are landed).
                                                          If history is
                                                          a guide, it
                                                          will work for
                                                          about two
                                                          weeks and then
                                                          trip again.</div>
                                                          <div dir="auto"> </div>
                                                          <div dir="auto">I&#39;m
                                                          dumbfounded. I
                                                          really don&#39;t
                                                          want to have
                                                          to tear this
                                                          whole system
                                                          apart. At this
                                                          point, if I
                                                          have to remove
                                                          all the
                                                          modules, I
                                                          feel that I
                                                          need to
                                                          replace all of
                                                          the trunk
                                                          cable which is
                                                          an expensive
                                                          proposition. I
                                                          really don&#39;t
                                                          know what else
                                                          to do at this
                                                          point.</div>
                                                          <div dir="auto"> </div>
                                                          <div dir="auto">Jason</div>
                                                          <div dir="auto"> </div>
                                                          </div>
                                                          <br>
                                                          <div>
                                                          <div dir="ltr">On
                                                          Mon, May 25,
                                                          2020, 10:43 AM
                                                          Jason
                                                          Szumlanski
                                                          &lt;<a href="mailto:jason@floridasolardesigngroup.com" rel="noreferrer noreferrer noreferrer" target="_blank">jason@floridasolardesigngroup.com</a>&gt;
                                                          wrote:</div>
                                                          <blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div style="font-family:arial,helvetica,sans-serif">I
                                                          strongly
                                                          suspect the
                                                          CH240 combined
                                                          breaker was
                                                          compromised
                                                          (we will see).
                                                          Since it
                                                          happened that
                                                          two different
                                                          strings
                                                          tripped, I
                                                          doubt I have
                                                          two
                                                          microinverters
                                                          with internal
                                                          faults. It has
                                                          to be the
                                                          combined
                                                          breaker. I was
                                                          just surprised
                                                          that branch
                                                          circuit
                                                          breakers were
                                                          tripping
                                                          simultaneously with
                                                          the combined
                                                          output
                                                          breaker.</div>
                                                          <div style="font-family:arial,helvetica,sans-serif"> </div>
                                                          <div style="font-family:arial,helvetica,sans-serif">Of
                                                          all the supply
                                                          side connected
                                                          systems I have
                                                          installed, I
                                                          have never
                                                          seen a
                                                          combined
                                                          output fusible
                                                          disconnect
                                                          fuse blow, but
                                                          I have seen
                                                          many combined
                                                          output
                                                          breakers
                                                          tripped. I was
                                                          worried early
                                                          on that I
                                                          would be
                                                          replacing
                                                          fuses
                                                          constantly,
                                                          but that has
                                                          not been an
                                                          issue
                                                          whatsoever.</div>
                                                          <div style="font-family:arial,helvetica,sans-serif"> </div>
                                                          <div style="font-family:arial,helvetica,sans-serif"> </div>
                                                          <div>
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <div dir="ltr">
                                                          <table cellspacing="0" cellpadding="0" border="0">
                                                          <tbody>
                                                          <tr>
                                                          <td rowspan="2"> </td>
                                                          <td rowspan="2"> </td>
                                                          </tr>
                                                          </tbody>
                                                          </table>
                                                          <div style="text-align:center"> </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          <br>
                                                          <div>
                                                          <div dir="ltr">On
                                                          Thu, May 21,
                                                          2020 at 11:15
                                                          AM &lt;<a href="mailto:scot.arey@solarcentex.com" rel="noreferrer noreferrer noreferrer" target="_blank">scot.arey@solarcentex.com</a>&gt;
                                                          wrote:</div>
                                                          <blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                                                          <div lang="EN-US">
                                                          <div>
                                                          <p>Actually,
                                                          we had a IQ7
                                                          string loaded
                                                          up to its max
                                                          panel size and
                                                          max string
                                                          length and in
                                                          the spring on
                                                          cool, clear
                                                          day, it
                                                          tripped the
                                                          string&#39;s
                                                          associated
                                                          breaker in the
                                                          Enphase
                                                          combiner.</p>
                                                          <div> <br>
                                                          </div>
                                                          <p>We reset
                                                          but of course
                                                          that breaker
                                                          was impaired
                                                          and it tripped
                                                          again. We
                                                          replaced and
                                                          never had an
                                                          issue going
                                                          forward. We
                                                          suspect the
                                                          breaker was
                                                          less than
                                                          perfect from
                                                          the start as
                                                          we&#39;ve add
                                                          equally nice
                                                          days since.</p>
                                                          <div> <br>
                                                          </div>
                                                          <p>This almost
                                                          reminds me of
                                                          loading up
                                                          Outback FM80.
                                                          It says 4,000
                                                          watts but in
                                                          reality, 3,600
                                                          is the max
                                                          when amps
                                                          spike. I will
                                                          be extra
                                                          careful going
                                                          forward on IQ7
                                                          string length
                                                          when going to
                                                          the max
                                                          published...</p>
                                                          <div> <br>
                                                          </div>
                                                          <p>My story.</p>
                                                          <div> <br>
                                                          </div>
                                                          <p>Scot</p>
                                                          <div> <br>
                                                          </div>
                                                          <div style="border-style:solid none none;border-top-width:1pt;border-top-color:rgb(225,225,225);padding:3pt 0in 0in">
                                                          <p><strong>From:</strong><span> </span>RE-wrenches
                                                          &lt;<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" rel="noreferrer noreferrer noreferrer" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>&gt;<span> </span><strong>On
                                                          Behalf Of<span> </span></strong>Jason
                                                          Szumlanski<br>
                                                          <strong>Sent:</strong><span> </span>Thursday,
                                                          May 21, 2020
                                                          8:57 AM<br>
                                                          <strong>To:</strong><span> </span>RE-wrenches
                                                          &lt;<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer noreferrer noreferrer" target="_blank">re-wrenches@lists.re-wrenches.org</a>&gt;<br>
                                                          <strong>Subject:</strong><span> </span>[RE-wrenches]
                                                          Enphase
                                                          intermittent
                                                          breaker
                                                          trippjng</p>
                                                          </div>
                                                          <div> <br>
                                                          </div>
                                                          <div>
                                                          <p>I&#39;m trying
                                                          to resolve an
                                                          intermittent
                                                          frustrating
                                                          problem with
                                                          and Enphase IQ
                                                          system. There
                                                          are three AC
                                                          Branch
                                                          circuits of 9
                                                          microinverters
                                                          each coming
                                                          into an
                                                          Enphase AC
                                                          combiner. </p>
                                                          <div>
                                                          <div> <br>
                                                          </div>
                                                          </div>
                                                          <div>
                                                          <p>What has
                                                          been happening
                                                          is one of the
                                                          BR220 branch
                                                          circuit
                                                          breakers and
                                                          the combine
                                                          CH240 breaker
                                                          in the main
                                                          backfed load
                                                          center have
                                                          been tripping
simultaneously. It has happened about four times in the last 6 months.
                                                          It was always
                                                          the same
                                                          branch circuit
                                                          breaker, so we
                                                          kept
                                                          investigating
                                                          that string,
                                                          checking the
                                                          junction box,
                                                          trunk cable,
                                                          and cap, etc.
                                                          Finally we
                                                          swapped out
                                                          the BR220
                                                          breaker. </p>
                                                          </div>
                                                          <div>
                                                          <div> <br>
                                                          </div>
                                                          </div>
                                                          <div>
                                                          <p>Fast
                                                          forward 4
                                                          weeks, and we
                                                          got another
                                                          call. This
                                                          time a
                                                          different
                                                          branch circuit
                                                          breaker and
                                                          the main
                                                          breaker
                                                          tripped
                                                          simultaneously.
                                                          We checked
                                                          that branch
                                                          circuit and
                                                          could not find
                                                          any fault. It
                                                          seems unlikely
                                                          that two
                                                          branch circuit
                                                          breakers would
                                                          be faulty, so
                                                          we have now
                                                          switched out
                                                          the CH240 main
                                                          breaker in
                                                          hopes that it
                                                          is the
                                                          culprit.  </p>
                                                          </div>
                                                          <div>
                                                          <div> <br>
                                                          </div>
                                                          </div>
                                                          <div>
                                                          <p>I&#39;m not
                                                          totally
                                                          confident in
                                                          this
                                                          resolution and
                                                          I have my
                                                          fingers
                                                          crossed. If
                                                          that doesn&#39;t
                                                          work, does
                                                          anyone have
                                                          any
                                                          suggestions on
                                                          another
                                                          diagnostic
                                                          step? These
                                                          intermittent
                                                          problems are a
                                                          major hassle.
                                                          One thought I
                                                          had was to
                                                          switch to a
                                                          supply side
                                                          interconnection
                                                          with a fusible
                                                          disconnect.
                                                          Maybe the
                                                          intermittent
                                                          fault would
                                                          blow one of
                                                          the two line
                                                          fuses so at
                                                          least I could
                                                          narrow it down
                                                          to which line
                                                          the fault is
                                                          on if there is
                                                          in fact a
                                                          fault.</p>
                                                          </div>
                                                          <div>
                                                          <div> <br>
                                                          </div>
                                                          </div>
                                                          <div>
                                                          <p>I have
                                                          experienced
                                                          two other
                                                          tripping
                                                          breaker issues
                                                          with Enphase
                                                          systems in the
                                                          past. Neither
                                                          of them were
                                                          systems I
                                                          installed. One
                                                          turned out to
                                                          be branch
                                                          circuits that
                                                          were not
                                                          properly
                                                          paired up and
                                                          landed on
                                                          different
                                                          breakers.
                                                          Another time
                                                          we had an
                                                          inverter with
                                                          an internal
                                                          fault which
                                                          eventually&quot;blew
                                                          up&quot; with a
                                                          loud popping
                                                          noise and
                                                          smoke
                                                          billowing out
                                                          of it. That
                                                          happened after
                                                          resetting a
                                                          trip breaker
                                                          multiple
                                                          times. This
                                                          case seems to
                                                          be unrelated
                                                          to those
                                                          issues. I&#39;m
                                                          perplexed. </p>
                                                          </div>
                                                          <div>
                                                          <div> <br>
                                                          </div>
                                                          </div>
                                                          <div>
                                                          <p>Jason
                                                          Szumlanski</p>
                                                          </div>
                                                          <div>
                                                          <p>Florida
                                                          Solar Design
                                                          Group</p>
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_______________________________________________<br>
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