It might be worth checking the brushes if it is an older unit. Chris Worcester
[email protected] from my Samsung Galaxy s9.
-------- Original message --------From: William Miller
<[email protected]> Date: 12/19/20 6:30 PM (GMT-08:00) To: RE-wrenches
<[email protected]> Subject: Re: [RE-wrenches] generator
tripping GFCI Friends:I have seen THD on the voltage waveform trip GFIs and
AFCIs. The case where this happened was during gen run periods. AC to DC
converters can be brutal in regards to generating distortion and sending it to
loads. I am out in the shop away from the manuals, but check if these FX
inverters can be programmed for Support mode on the gen input. This may knock
THD back to acceptable levels, if indeed this is the cause. Best of luck.
William Millerwww.millersolar.comOn Dec 19, 2020, at 5:33 PM, Darryl Thayer
<[email protected]> wrote:The way a GFCI operates is by comparing the line
current and the neutral current inside the device. If some of the neutral
current is returning through a ground circuit instead of the neutral the
imbalance will trip the device. The generator neutral and the inverter neutral
must have a common neutral-ground bond and only one! Your presentation
indicates operational differences, multiple bonding points (two or more) can
cause a neutral ground imbalance when load, source changes occur. The
load-source changes can affect the tripping result. On Sat, Dec 19, 2020 at
5:23 PM jay <[email protected]> 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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