I'm looking at two Eaton PV250 inverters that failed simultaneously as far as we know (not my install). Everything checked out normal, but no display and no power output. I suspect both boards are bad. Upon digging into the scenario I discovered that the owner had a whole-house generator transfer switch installed a while back, after the PV was installed. The PV is a load side interconnection, so calamity should have been expected.
What are the odds that the generator caused the inverter boards to fail? I was always under the impression that it was more likely for a generator component to be damaged than an inverter component in this scenario. It could be coincidence and the inverters may have just failed around the same. Note: ~10kW PV, 25kW Generator Side note: The PV was interconnected at a 50A breaker on a 200A bus bar in the main distribution panel and somehow passed inspection by an AHJ that shall not be named... Over 120%, and also not the correct OCPD rating anyway for these two inverters. Passed plan review and inspection... Contractor out of business... surprise! Jason Szumlanski Florida Solar Design Group
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