In my experiance if the combiner is in the sun breakers will be hot breakers are a thermal device and should be kept at room temperature. Try substituting the HCAC type breaker for the stanard breaker
On Thu, May 21, 2020, 8:57 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 > >
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