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GFDI tripping disconnected PV Array ground

Posted: Fri Feb 02, 2018 1:08 pm
by Smclark59
My GFDI keeps tripping anytime I turn on the PV Array connect switch. This has been constant since I replaced my generator with a new AGS compatible generator. Generator works fine. Searched for the ground fault and traced it the positive to ground having same volts as positive to neutral. Took apart just about everything, and couldnÔÇÖt fix the fault. Just disconnected the ground from the PV combiner box to charge controller and the GFDI did not trip. Any suggestions?

Steve

VFXR 3524A
1180 watt Array
Off-grid
740 ah battery storage
General 7.5 kw Propane standby generator

Re: GFDI tripping disconnected PV Array ground

Posted: Fri Feb 02, 2018 3:02 pm
by Mike Curran
Sounds like your new generator has its neutral bonded to the frame - grounded, in effect. You should be able to disconnect that ground connection to neutral. Check your generator manual.

Re: GFDI tripping disconnected PV Array ground

Posted: Sat Feb 03, 2018 1:24 pm
by Smclark59
Disconnected generator entirely from the system and the GFDI trips as soon as connect the PV Array. Any ideas? Still get current when connecting positive from Array to ground from Array. Nothing between ground and neutral from Array.

Appreciate any additional ideas. I have retired the combiner box to the charge controller and removed generator entirely.

Re: GFDI tripping disconnected PV Array ground

Posted: Sat Feb 03, 2018 2:14 pm
by Smclark59
Additionally, when I use my multimeter with one probe on the positive from the Array and the other one in a screw hole on the metal casing of the charge controller/inverter I get current as well.

Re: GFDI tripping disconnected PV Array ground

Posted: Sat Feb 03, 2018 3:11 pm
by Mike Curran
If this just started when the new generator was added, and now it does it even with the generator disconnected, some other change is causing it. Somewhere your PV array's negative output is grounded.
Smclark59 wrote:I have retired the combiner box to the charge controller and removed generator entirely.
What do you mean by "retired the combiner box"? Maybe in doing that your PV array negative was inadvertently grounded?

Re: GFDI tripping disconnected PV Array ground

Posted: Sun Feb 04, 2018 2:04 pm
by Smclark59
I have rewired every connection from the combiner box to charge controller, and removed all connections to generator. I made sure the neutral wire from combiner box is not touching any metal until the connection to the neutral bus.

Today, I disconnected the neutral wire from the neutral bus, but still got 17-22 volts between all grounds and positive wire, and between positive wire and the charge controller metal box. The GFDI trips once the amps on the charge controller get over 1.4 amps when I turn on the PV Array. With the neutral wire removed from the bus bar the gfdi does not trip.

Any suggestion?

Re: GFDI tripping disconnected PV Array ground

Posted: Sun Feb 04, 2018 2:38 pm
by Mike Curran
Sorry Steve, I'm running out of ideas. FWIW, here's a link to the GFDI manual: http://www.outbackpower.com/downloads/d ... _REV_A.pdf

- Mike

Re: GFDI tripping disconnected PV Array ground

Posted: Tue Feb 06, 2018 10:17 am
by solartribe
is your relay for the AGS two wire start still hooked up?
i once ran into a grounding issue with a 48v system bank and a 12v generator starting battery.
Its not the same problem as yours, but could have similar roots. Disconnect any wires currently connected to your inverter's AUX output and see if that changes anything?