I considered that, but it's tripping at night, so it's not a power output issue. It does have #6 wire, so this could be done, but I don't think it's related. It's a genuine CH240 breaker. We even replaced it once before.
At this point, I must have a fault or faults on the roof. Maybe a rodent chewed through some wires. I'm going to wait for another fault and then go pull the modules to check it out. On Mon, Jun 1, 2020 at 11:00 AM jay <jay.pe...@gmail.com> wrote: > Hi Jason, > > My curiosity is about both breakers tripping. > I would suggest using a larger output breaker, I believe its a 40, put in > a 50 as a test. I would assume the wire size will still be protected by > the 50. > > And I would also ask if the breakers are actual CH or clones? > > jay > > peltz power > > On Jun 1, 2020, at 7:23 AM, Jason Szumlanski < > ja...@floridasolardesigngroup.com> wrote: > > 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. > > 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. > > 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. > > Jason > > > On Mon, May 25, 2020, 10:43 AM Jason Szumlanski < > ja...@floridasolardesigngroup.com> wrote: > >> 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. >> >> 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. >> >> >> >> >> >> >> On Thu, May 21, 2020 at 11:15 AM <scot.a...@solarcentex.com> wrote: >> >>> 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’s >>> associated breaker in the Enphase combiner. >>> >>> >>> >>> 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’ve add equally nice days since. >>> >>> >>> >>> 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… >>> >>> >>> >>> My story. >>> >>> >>> >>> Scot >>> >>> >>> >>> *From:* RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> *On >>> Behalf Of *Jason Szumlanski >>> *Sent:* Thursday, May 21, 2020 8:57 AM >>> *To:* RE-wrenches <re-wrenches@lists.re-wrenches.org> >>> *Subject:* [RE-wrenches] Enphase intermittent breaker trippjng >>> >>> >>> >>> 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. 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