Jay,
Agree with Ray that two neutral ground bonds can cause strange behavior.
But the timing near the end of the charge cycle makes me wonder if the
issue is related to one inverter shutting down the charger before the
other. The VFX 3648 charger mode is a terrible load and will cause weird
output wave forms on most generators, and when only one inverter is
charging, the harmonics will show up on the neutral.
Kent Osterberg
Blue Mountain Solar
On 12/19/2020 2:33 PM, jay wrote:
HI All,
I have a client with a older Kohler 8-10kw generator, VFX 3648 stacked
inverters, newer rolls batteries. its been installed and operating normally for
10+ years.
Customer had to upgrade the house for code, which involved installing GFCI
outlets and GFCI breakers.
Since then the GFI outlets trip every time the generator starts but only after
3-30 minutes. They work normally on the inverters. And if you do a
bypass/generator direct the GFI outlets don’t trip.
The GFI breakers trip when the generator is about to turn off, not during warm
down but say 30 minutes before it will turn off. So charging current is at the
lowest. And again they all work normally on the inverters and all the rest of
the charge cycle.
Voltage is a bit high, around 254v-259v from the generator but it is the whole
time and seems to stable voltage. But if the voltage was the issue the outlets
would keep tripping. If it was too high for the breakers, why at the end and
not the beginning?
I’m thinking its possibly a control board in the generator that’s not working
well. Can’t keep up with the PF for the inverters, etc.
Buts its a new issue I’ve not run across.
Any ideas?
thanks
jay
peltz power
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