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200AMP Breaker trips same time every night

Hi.... For the last 9 nights, (but not every night) my main 200AMP Breaker keeps tripping, ironically, at roughly the same time every night, between 8:30 and 9:40PM. We are not running the AC. It happened Saturday Night 3x, and last night Sunday 2x.
We thought (I still think) it might be our brand new (2 weeks old) PV Solar Equipment, but yesterday AM the Solar Company, over the phone, had me power off everything related to the Solar system (turned off the DC breaker, flipped off the two inverters and turned off the 2 breakers relating to the PV equipment. Last night, it tripped at 9:20PM and again at 9:40PM. With the Solar equip powered down. I also have a USES system (shunt efficiency system), I turned those off the day before, and it still tripped with those in the ''off'' position. We have a 200AMP system in the basement which feeds the whole house, and an additional 200AM Square D outside (attached to the house) which we installed 3 years ago for the pool house, pool equipment, deck and outdoor kitchen.....that breaker is fine, only the basement one (the original) trips. The house was built in 2001.
I think it involved the Solar System (even though it's now ''off''), only because it seems too much of a coincidence that all of a sudden, we now have this problem, one week after the system was installed.....and what's up with it happening at the same time of day....any suggestions?
Jesse (jjb@jess.com)

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Something doesn't sound right here. You indicate 2 200Amp breakers. With a single service entering the house, this is not possible. The "sub-panel" to the pool house is more likely a 100Amp setup, yes? If not, you have a bad setup and it should be corrected. I would suspect that you are attempting to pull too much current to the pool and that is what is tripping the breaker. Also, these breakers should not be run over about 80% of their capacity for the long haul. If they are, they tend to age and get either real sensitive causing tripping when it shouldn't or you can run 500Amps through it and it won't trip.

My suggestion is to revisit the setup. If the pool house is fed from the main panel, make sure that the breaker for it is not 200Amp. Second, try disabling the pool house breaker to see if that is the source of the problem and look more closely there.

Keep us posted.

Dan

Posted on Jun 29, 2009

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The breaker could also be on it's way out I've seen it before so don't rule it out

Posted on Mar 05, 2016

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I agree with Dan, Sub panels are feed from the main (200A) so the sub panel should be a lower Rating (100A). You should also have only one shutoff at the main for the sub panel.

Posted on Mar 05, 2016

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