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<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?<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 6/1/20 10:23 AM, Jason Szumlanski
wrote:<br>
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<div dir="auto">Well, that didn'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"><br>
</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"><br>
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<div dir="auto">I'm dumbfounded. I really don'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't know what else to do at this point.</div>
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<div dir="auto">Jason</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, May 25, 2020, 10:43 AM
Jason Szumlanski <<a
href="mailto:jason@floridasolardesigngroup.com"
moz-do-not-send="true">jason@floridasolardesigngroup.com</a>>
wrote:<br>
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<div class="gmail_default"
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 class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
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>
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<div dir="ltr" class="gmail_attr">On Thu, May 21, 2020 at
11:15 AM <<a href="mailto:scot.arey@solarcentex.com"
target="_blank" rel="noreferrer"
moz-do-not-send="true">scot.arey@solarcentex.com</a>>
wrote:<br>
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<p class="MsoNormal">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\u2019s associated breaker in the
Enphase combiner.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">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\u2019ve add equally nice days since.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">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\u2026</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">My story.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Scot</p>
<p class="MsoNormal"> </p>
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<p class="MsoNormal"><b>From:</b> RE-wrenches <<a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank"
rel="noreferrer" moz-do-not-send="true">re-wrenches-bounces@lists.re-wrenches.org</a>>
<b>On Behalf Of </b>Jason Szumlanski<br>
<b>Sent:</b> Thursday, May 21, 2020 8:57 AM<br>
<b>To:</b> RE-wrenches <<a
href="mailto:re-wrenches@lists.re-wrenches.org"
target="_blank" rel="noreferrer"
moz-do-not-send="true">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Subject:</b> [RE-wrenches] Enphase
intermittent breaker trippjng</p>
</div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">I'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>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">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>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">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>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">I'm not totally confident
in this resolution and I have my fingers
crossed. If that doesn'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>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">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"blew up" 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'm perplexed. </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Jason Szumlanski</p>
</div>
<div>
<p class="MsoNormal">Florida Solar Design Group</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
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