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
<mailto: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
<mailto: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
<mailto: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
<mailto: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. I'm perplexed.
Jason Szumlanski
Florida Solar Design Group
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