Hi Chad Was the enphase monitoring able to locate the bad inverter? Or trial and error?
Jay Peltz power. > On May 21, 2020, at 7:19 AM, Chad Waits <chadwa...@netzerosolar.net> wrote: > > > 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. > > really frustrating. > > Chad Waits > President-Net Zero Solar > Cell: (520) 270-4873 > > > >> On Thu, May 21, 2020 at 7:15 AM Jason Szumlanski >> <ja...@floridasolardesigngroup.com> wrote: >> 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. >> >> 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. >> >> I also ruled out rain. The first couple of times I suspected something got >> wet, but subsequent tripping occurred during dry spells. >> >>> On Thu, May 21, 2020, 10:12 AM Chad Waits <chadwa...@netzerosolar.net> >>> wrote: >>> Hey Jason, >>> >>> 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. >>> >>> <Screen Shot 2020-05-21 at 7.10.24 AM.png> >>> >>> <Screen Shot 2020-05-21 at 7.09.59 AM.png> >>> >>> >>> I'd appreciate anything you may find out in your investigations. >>> >>> Thanks! >>> >>> Chad Waits >>> President-Net Zero Solar >>> Cell: (520) 270-4873 >>> >>> >>> >>>> On Thu, May 21, 2020 at 6:57 AM Jason Szumlanski >>>> <ja...@floridasolardesigngroup.com> wrote: >>>> 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. >>>> >>>> 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. >>>> >>>> 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. >>>> >>>> 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. >>>> >>>> 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. >>>> >>>> Jason Szumlanski >>>> Florida Solar Design Group >>>> >>>> >>>> _______________________________________________ >>>> List sponsored by Redwood Alliance >>>> >>>> List Address: RE-wrenches@lists.re-wrenches.org >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> List-Archive: >>>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >>>> >>>> List rules & etiquette: >>>> www.re-wrenches.org/etiquette.htm >>>> >>>> Check out or update participant bios: >>>> www.members.re-wrenches.org >>>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: >>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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