I read all I could find about the subject of GFCI tripping when using MultiPlus-II but, I couldn't find any information that would match my situation.
My hope is to use this system as a home backup in case of outage and as a cost cutting during high peak hours. (Use power from my batteries for some circuits during high peak hours and recharge the batteries after midnight in off peak hours)
I have a 4 circuit transfer switch installed next to my sub-panel inside my laundry room by an electrician. The MEN is at the main panel in my condo complex.
MY SYSTEM IS MOBILE (A WOODEN SHED ON RUBBER WHEELS WITH NO EARTH GROUND.
IT WILL BE ALWAYS USED CONNECTED TO THE SAME AC SOURCE AT MY HOME AND NOT MOVE AROUND OR USE ANY OTHER AC INPUT.
Here is my problem:
1-The problem I have is that every time I try to use the GFCI outlet (at my patio) and the AC out1 line of my MultiPlus-II out to my transfer switch together- the GFCI outlet I am using trips.
2-The MultiPlus-II works fine charging the batteries and inverting at the same time as long as I don't connect AC out1 to the transfer switch.
3-The AC out1 from my MultiPlus-II to my transfer switch circuits works fine as long as the AC-in is not connected.
4-The charging of my batteries works fine from my patio GFCI outlet by itself.
5-If I plug in the system inside my home outlet without GFCI everything works fine. I can charge the battery and pass through the AC to the transfer switch without any problems at all, but I have to use the outside outlet and it has to be GFCI protected. (The inside outlet I tested with is on circuit that is not on the transfer switch of course)
6-The system has no errors or any notification of problems.
Do I need my ground relay on or off if I always will be connected to my house outlet?
Even if my grid goes down my ac ground from the house still would be connected to my system, wouldn't it be?