[RE-wrenches] Inverter Failure Due to Generator Backfeed (?)

Jerry Shafer jerrysgarage01 at gmail.com
Fri Jan 29 15:18:24 PST 2016


We have seen something very close, it appears that the gwnny will always
win this war.
Jerry
On Jan 29, 2016 1:14 PM, "Jason Szumlanski" <
jason at floridasolardesigngroup.com> wrote:

> 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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