The breaker in the main panel IS tripping simultaneously with one of the branch circuit breakers each time.
On Wed, Jun 3, 2020 at 12:43 PM Jay <jay.pe...@gmail.com> wrote: > A question that keeps nagging me is why do these breakers trip and not the > breaker in the main panel? > Presuming there is a 40 amp in the main > > I would have thought that given all the times the breakers have tripped at > some point that one would have tripped and I can’t understand why not? > > Jay > > On Jun 3, 2020, at 8:27 AM, Jerry Shafer <jerrysgarag...@gmail.com> wrote: > > > Wrenches > Looking g at the bigger breaker tripping at the same time is very likely > do to response time of the breaker nothing more. As l suggested in a > previous message. Use a non bridged breaker to see if it is one or both > legs that trip. Also an eguage will help to see what if anything leads up > to the failure and when. > Jerry > Jerry > > On Wed, Jun 3, 2020, 7:58 AM Jason Szumlanski < > ja...@floridasolardesigngroup.com> wrote: > >> I wonder about that. Of course, it could be the "inverter output circuit" >> having a fault in the wiring still (an intermittent issue somewhere within >> the IQ cable or home run wiring). But internal to the microinverter, is it >> possible that a fault could still occur at night? I had a suggestion from >> another wrench that there are film capacitors on the AC output side, but >> are these isolated when there is no DC input? It seems unlikely that this >> would be an issue, but I have seen microinverters reporting a couple of >> watts at night (in Enlighten). I'm not sure how real that is. >> >> The overriding question I have is what kind of fault would cause BOTH a >> branch circuit and the main solar breaker to trip simultaneously? That >> seems odd to me. If any normal load branch circuit has a fault, you don't >> often see premises main breakers tripping, or even feeder circuit breakers. >> >> I got to thinking that maybe there is some kind of issue between the >> BR220 and CH240 breakers not playing nicely together. But I would think >> this would be a well-known issue because I'm sure there are tons of CH >> feeder breakers in the wild with BR branch circuits downstream. >> >> >> >> On Tue, Jun 2, 2020 at 9:25 AM <drake.chamber...@redwoodalliance.org> >> wrote: >> >>> If it trips at night, we know it is not the output from the inverters >>> causing the tripping. The current must be coming from the grid. >>> --- >>> >>> >>> >>> On 2020-06-01 12:05, Jason Szumlanski wrote: >>> >>> >>> It's not weather. It's at all times of the day and night, and I >>> confirmed that there is no correlation to rain or high winds. That was my >>> first suspicion. >>> >>> >>> On Mon, Jun 1, 2020 at 10:27 AM Ray <r...@solarray.com> wrote: >>> >>> 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? >>> >>> Ray Walters >>> Remote Solar >>> 303 505-8760 >>> >>> On 6/1/20 10:23 AM, Jason Szumlanski 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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