<div dir="ltr">Thanks all for the suggestions. <div><br><div>Regarding the stacking, I read a little more into it. It seems like this is actually neither series or parallel stacking, </div><div>since each inverter independently feeds its own 120V backed up loads panel. It will be interesting though to </div><div>turn off one inverter and see if the issue continues, which would rule out a stacking concern.</div><div><br></div><div>Sounds like it will also be worth bypassing the GTI to see if that could be causing any issues. </div><div><br></div><div>There is also no concern about limiting selling here. They do have utility approval for selling.<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br></div><div>Tump, you mention unplugging a cord/plug. Can you tell me a little more about what operation this would confirm? The system is not AC coupled.</div><div><br></div><div>I&#39;ll report back with what I learn.</div><div>Cheers, </div><div>Dave</div><div><br></div><div><b><font face="tahoma, sans-serif">Dave Tedeyan, PE</font></b></div><div><font face="tahoma, sans-serif">Senior Engineer | Taitem Engineering, PC</font></div><div><font face="tahoma, sans-serif"><img src="https://www.taitem.com/signatures/logo.png"><br></font></div><div><font face="tahoma, sans-serif">110 South Albany Street</font><span style="font-family:tahoma,sans-serif"> | Ithaca, NY 14850</span></div><div><font face="tahoma, sans-serif">o. <u>607.277.1118 x121</u>  f. 607.277.2119</font></div><div><font face="tahoma, sans-serif"><a href="http://www.taitem.com" target="_blank">www.taitem.com</a></font></div><div><br></div><div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Solar </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022</span><span style="font-family:tahoma,sans-serif;font-size:12.5pt;line-height:17.8333px"> </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Sustainability </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Energy </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Design</span><br></div><div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px"><span style="font-family:Tahoma,sans-serif;font-size:13.3333px">Certified B-Corporation since 2013</span><span style="font-size:13.3333px"><br></span></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Dec 20, 2019 at 6:01 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 bgcolor="#FFFFFF">
    <p>The SWs were awesome for off grid in their day, but infamous for
      burning up a couple of kW worth of array in inefficiency when grid
      tied.  I actually saw several systems that consumed more power
      from the grid than they produced.  Once the GTI box was added,  it
      just got worse.  I would compare that system to an early 80s
      carbureted vehicle: partial design solutions stacked on top of
      each other to meet emissions standards; then we got computer
      controlled fuel injection.  Nobody ever went back.  I&#39;d suggest
      the same there: It never was a good GT solution.  The equipment is
      beyond its usable life anyway, time to upgrade.    <br>
    </p>
    <pre cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
    <div>On 12/20/19 3:37 PM, Tump wrote:<br>
    </div>
    <blockquote type="cite">
      
      With this set up the AC feed <b><i>into</i></b>
      the grid is not constant. The current will ramp up then back down.
      Open the connection end of the inverters and you will see a small
      black (behind the cardboard) cord/plug that can be disconnected to
      confirm operation &amp; disable ramping effect. As long as the
      inverters are connected to L1/L2 respectfully as individual
      inverters then this should work. I do have the cable, but its
      really not the most efficient AC coupling design out there.
      <div>The SWs still can be repaired using older boards but
        its pricy,  there is a market for them so  you might be able to
        sell them and purchase something a bit more up to date. I have
        the cable &amp; a refurbished XW5548 contact me off list if
        interested. Tump<br>
        <div>
          <div>
            <blockquote type="cite">
              <div>On Dec 20, 2019, at 2:18 PM, Lloyd
                Hoffstatter &lt;<a href="mailto:lloyd@sunstruckconsulting.com" target="_blank">lloyd@sunstruckconsulting.com</a>&gt;
                wrote:</div>
              <br>
              <div>
                <div style="font-family:Times-Roman;font-size:18px;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">
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Dave,</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Guessing
                    it\u2019s a synchronization problem between the two
                    inverters.</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Depending
                    on the placement of the grid tie breakers, the two
                    inverters are presenting themselves as either in
                    parallel (2 x 120v sources on the same leg) or
                    \u201cseries\u201d (120 / 240 on two 120V legs).</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">The
                    attached manual excerpt and tech note talk about
                    both.  Seems that you need a synch cable in either
                    case, recently did a rebuild on an SW 5048 (pm for
                    internals rebuilder info) and needed cable to get
                    both inverters to work properly.</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Have at
                    least one grid-tie / backup system that has been
                    running for years with dual SW / GTI\u2019s \u2013 time for
                    battery replacement, rest of system still going\u2026</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Best
                    regards,</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Lloyd</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Lloyd
                    Hoffstatter</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Sunstruck
                    Consulting</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Sent
                    from<span> </span><a href="https://go.microsoft.com/fwlink/?LinkId=550986" style="color:blue;text-decoration:underline" target="_blank">Mail</a><span> </span>for Windows
                    10</div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
                  <div style="border-style:solid none none;border-top-color:rgb(225,225,225);border-top-width:1pt;padding:3pt 0in 0in">
                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif;border:none;padding:0in"><b>From:<span> </span></b><a href="mailto:dtedeyan@taitem.com" style="color:blue;text-decoration:underline" target="_blank">Dave Tedeyan</a><br>
                      <b>Sent:<span> </span></b>Friday,
                      December 20, 2019 1:03 PM<br>
                      <b>To:<span> </span></b><a href="mailto:offgridsolar@sti.net" style="color:blue;text-decoration:underline" target="_blank">offgridsolar@sti.net</a>;<span> </span><a href="mailto:re-wrenches@lists.re-wrenches.org" style="color:blue;text-decoration:underline" target="_blank">RE-wrenches</a><br>
                      <b>Subject:<span> </span></b>Re:
                      [RE-wrenches] Xantrex SW 4048 grid tie mystery</div>
                  </div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Dave,<u></u><u></u></div>
                  <div>
                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Sorry,
                      misspeak on my part. It is DC negatives and
                      grounds that are tied together. No neutrals in the
                      DC box.<u></u><u></u></div>
                  </div>
                  <div>
                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Cheers,<u></u><u></u></div>
                  </div>
                  <div>
                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Dave<br clear="all">
                      <u></u><u></u></div>
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                                                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
                                                  </div>
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                                                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="font-family:Tahoma,sans-serif">Dave
                                                          Tedeyan, PE</span></b><u></u><u></u></div>
                                                  </div>
                                                  <div>
                                                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-family:Tahoma,sans-serif">Senior
                                                        Engineer |
                                                        Taitem
                                                        Engineering, PC</span><u></u><u></u></div>
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                                                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-family:Tahoma,sans-serif">110
                                                        South Albany
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                                                        f. 607.277.2119</span><u></u><u></u></div>
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                    <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
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                  <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
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                    <div>
                      <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">On Fri, Dec 20, 2019 at 12:57 PM Dave
                        Angelini Offgrid Solar &lt;<a href="mailto:offgridsolar@sti.net" style="color:blue;text-decoration:underline" target="_blank">offgridsolar@sti.net</a>&gt;
                        wrote:<u></u><u></u></div>
                    </div>
                    <blockquote style="border-style:none none none solid;border-left-color:rgb(204,204,204);border-left-width:1pt;padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
                      <p>Why would neutral be in the DC conduit
                        box? This just wrong but I doubt this is the
                        problem.</p>
                      <p>Since this never worked properly or
                        has not in 13 years, I would suggest replacement
                        with modern equipment. SW from xantrex has been
                        out of support for around 15 years and always
                        was a headache grid tied, in my opinion.</p>
                      <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;"><strong><span style="font-family:&quot;Courier New&quot;">Dave Angelini Offgrid Solar<u></u><u></u></span></strong></pre>
                      <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;"><strong><span style="font-family:&quot;Courier New&quot;">&quot;we go where powerlines don&#39;t&quot;<u></u><u></u></span></strong></pre>
                      <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;"><strong><span style="font-family:&quot;Courier New&quot;"><a href="http://members.sti.net/offgridsolar/" style="color:blue;text-decoration:underline" target="_blank">http://members.sti.net/offgridsolar/</a><u></u><u></u></span></strong></pre>
                      <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;"><strong><span style="font-family:&quot;Courier New&quot;">e-mail  <a href="mailto:offgridsolar@sti.net" style="color:blue;text-decoration:underline" target="_blank">offgridsolar@sti.net</a><u></u><u></u></span></strong></pre>
                      <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;"><strong><span style="font-family:&quot;Courier New&quot;">text 209 813 0060</span></strong></pre>
                      <p>On Fri, 20 Dec 2019 12:44:42 -0500,
                        Dave Tedeyan &lt;<a href="mailto:dtedeyan@taitem.com" style="color:blue;text-decoration:underline" target="_blank">dtedeyan@taitem.com</a>&gt;
                        wrote:<u></u><u></u></p>
                      <blockquote style="border-style:none none none solid;border-left-color:rgb(16,16,255);border-left-width:1.5pt;padding:0in 0in 0in 4pt;margin-left:3.75pt;margin-top:5pt;margin-bottom:5pt">
                        <div>
                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Hi All, <span> </span><u></u><u></u></div>
                          <div>
                            <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">I am someone&#39;s
                                last ditch effort to get their system
                                working which has been non-functional
                                since a few months after installation,
                                13 years ago...<u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">After getting some
                                new batteries in there, I can at least
                                fire it up. It is a grid tie with
                                battery backup situation with two
                                Xantrex SW4048 inverters. Each inverter
                                is kind of like its own system with two
                                Outback MX60 CC&#39;s per inverter, and each
                                inverter powers its own 120V backed up
                                loads panel. They do not see each other
                                until their 60A single pole breakers in
                                the main panel. <u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">What seems to be
                                happening is that after turning on the
                                inverters the AC1 in good light will
                                flash for about 30 seconds, then it
                                syncs up to the grid and the light stays
                                on solid. But then after a little bit,
                                that light will start flashing,
                                indicating that the utility power has
                                been dropped, when it has not actually
                                been dropped. Then at some point the
                                backed up loads would lose power. The
                                customer says that every 1-10 minutes,
                                they would lose the backed up loads for
                                10-90 seconds. This happened all night
                                long until they bypassed the inverters.<u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">There are a few
                                other things of note:<u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">1. There is a
                                Xantrex GTI for each inverter.<u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">2. I see in the
                                manual there is information about
                                stacking the inverters, but I am
                                guessing in this setup this not
                                necessary or would even be counter
                                productive to stack the inverters. Not
                                sure if the inverters not being stacked
                                could cause one of them to unsync with
                                the utility?<u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">3. Neutrals and
                                grounds are bonded in their main panel,
                                but also in each of the Xantrex DC
                                breaker boxes. I was going to separate
                                them in the DC breaker boxes, but found
                                that there is no way to isolate the
                                battery negative bus from the box
                                itself, and figured it would be dodgy to
                                unground the enclosure. So I am also not
                                sure if the multiple N-G bonds could be
                                causing these issues.<u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Does anyone have
                                any ideas?<u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Cheers, <u></u><u></u></div>
                            </div>
                            <div>
                              <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">Dave<u></u><u></u></div>
                            </div>
                            <div>
                              <div>
                                <div>
                                  <div>
                                    <div>
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                                                      <div>
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                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div>
                                                          </div>
                                                          <div>
                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><strong><span style="font-family:Tahoma,sans-serif">Dave Tedeyan, PE</span></strong><u></u><u></u></div>
                                                          </div>
                                                          <div>
                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-family:Tahoma,sans-serif">Senior Engineer |
                                                          Taitem
                                                          Engineering,
                                                          PC</span><u></u><u></u></div>
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                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-family:Tahoma,sans-serif">110 South Albany
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                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-family:Tahoma,sans-serif">o.<span> </span><u>607.277.1118
                                                          x121</u>  f.
                                                          607.277.2119</span><u></u><u></u></div>
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                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-family:Tahoma,sans-serif"><a href="http://www.taitem.com/" style="color:blue;text-decoration:underline" target="_blank">www.taitem.com</a></span><u></u><u></u></div>
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                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"> <u></u><u></u></div>
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                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:Tahoma,sans-serif">Solar \u2022</span><span style="font-size:12.5pt;font-family:Tahoma,sans-serif"> </span><span style="font-size:10pt;font-family:Tahoma,sans-serif">Sustainability \u2022 Energy \u2022 Design</span><u></u><u></u></div>
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                                                          <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:10pt;font-family:Tahoma,sans-serif">Certified
                                                          B-Corporation
                                                          since 2013</span><u></u><u></u></div>
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                                          </div>
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                                  </div>
                                </div>
                              </div>
                            </div>
                          </div>
                        </div>
                      </blockquote>
                      <div>
                        <div style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">--<span> </span><u></u><u></u></div>
                        <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;"> </pre>
                        <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;"> </pre>
                      </div>
                    </blockquote>
                  </div>
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                <span id="gmail-m_-1773245027826998954cid:E0882320-E8F0-4D4F-B56E-98675E47DF27@maine.rr.com">&lt;SW
                  Series Manual on multiple inverters.pdf&gt;</span><span id="gmail-m_-1773245027826998954cid:3635B772-F85A-42CD-86AB-4144589D6BE8@maine.rr.com">&lt;SWI
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                                      <div style="margin:0px;font:12px &quot;Times New Roman&quot;">   <span style="font-weight:normal;color:rgb(45,44,250)">             </span><span style="font:18px &quot;Times New Roman&quot;;color:rgb(45,44,250)">Solarwinds
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