<div dir="ltr">Trial and error only unfortunately.<div><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><font face="verdana, sans-serif">Chad Waits<br>President-Net Zero Solar<br></font></div><div><font face="verdana, sans-serif">Cell: (520) 270-4873</font></div><div><img src="https://docs.google.com/uc?export=download&id=1CZeGbo9iUeTH6n8AS3795Goiah0hoOpt&revid=0B0cUZ0al4NwMQ2h1YkpnSk5IUXZscjQvQ0EwVEhiMnROd1N3PQ" width="96" height="32"><br></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 21, 2020 at 8:14 AM Jay <<a href="mailto:jay.peltz@gmail.com">jay.peltz@gmail.com</a>> 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 Chad </div><div dir="ltr"><br></div><div dir="ltr">Was the enphase monitoring able to locate the bad inverter? Or trial and error?</div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br></div><div dir="ltr">Peltz power. </div><div dir="ltr"><br><blockquote type="cite">On May 21, 2020, at 7:19 AM, Chad Waits <<a href="mailto:chadwaits@netzerosolar.net" target="_blank">chadwaits@netzerosolar.net</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<div dir="ltr">Yeah. We've had them trip in the evening as well. Just never come back online when the sun comes up. We've replaced breakers and meggered all wires. The only solution we've found is isolating that one bad inverter and replacing it.<div><br></div><div>really frustrating.</div><div><br clear="all"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><font face="verdana, sans-serif">Chad Waits<br>President-Net Zero Solar<br></font></div><div><font face="verdana, sans-serif">Cell: (520) 270-4873</font></div><div><img src="https://docs.google.com/uc?export=download&id=1CZeGbo9iUeTH6n8AS3795Goiah0hoOpt&revid=0B0cUZ0al4NwMQ2h1YkpnSk5IUXZscjQvQ0EwVEhiMnROd1N3PQ" width="96" height="32"><br></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 21, 2020 at 7:15 AM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>> 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">I'm guessing I don't have a bad inverter problem since this is occurring on two different strings. But I guess I can't rule it out.<div dir="auto"><br></div><div dir="auto">I should also have mentioned that the breakers apparently trip in the middle of the night more often than not. I know that because the envoy goes offline. So this does not seem to be a power production issue. The inverters should be sleeping at the time that the breakers trip.</div><div dir="auto"><br></div><div dir="auto">I also ruled out rain. The first couple of times I suspected something got wet, but subsequent tripping occurred during dry spells.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 21, 2020, 10:12 AM Chad Waits <<a href="mailto:chadwaits@netzerosolar.net" target="_blank">chadwaits@netzerosolar.net</a>> 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">Hey Jason,<div><br></div><div>We have experienced this on multiple systems over the past 2 years. We have one system where 1 inverter pops an entire sub offline that has 72 other inverters in it (screenshots attached). The only way we have been able to isolate the problem inverter(s) is to start first with isolating circuits, and then unplugging individual inverters until the culprit is found. We've had multiple cases escalated to top engineers and we have yet to get an explanation of what is going on. Obviously something in the bad inverter(s) is creating a catastrophic short but what is causing that has not been revealed to us.</div><div><br></div><div><div><div><Screen Shot 2020-05-21 at 7.10.24 AM.png></div><br></div><div><div><Screen Shot 2020-05-21 at 7.09.59 AM.png></div><br></div></div><div><br></div><div>I'd appreciate anything you may find out in your investigations.</div><div><br></div><div>Thanks!</div><div><br></div><div><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><font face="verdana, sans-serif">Chad Waits<br>President-Net Zero Solar<br></font></div><div><font face="verdana, sans-serif">Cell: (520) 270-4873</font></div><div><img src="https://docs.google.com/uc?export=download&id=1CZeGbo9iUeTH6n8AS3795Goiah0hoOpt&revid=0B0cUZ0al4NwMQ2h1YkpnSk5IUXZscjQvQ0EwVEhiMnROd1N3PQ" width="96" height="32"><br></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 21, 2020 at 6:57 AM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" rel="noreferrer" target="_blank">jason@floridasolardesigngroup.com</a>> 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">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. <div dir="auto"><br></div><div dir="auto">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. </div><div dir="auto"><br></div><div dir="auto">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. </div><div dir="auto"><br></div><div dir="auto">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.</div><div dir="auto"><br></div><div dir="auto">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. </div><div dir="auto"><br></div><div dir="auto">Jason Szumlanski</div><div dir="auto">Florida Solar Design Group</div><div dir="auto"><br></div><div dir="auto"><br></div></div>
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