GFCI Before MP2

DIY
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1

I have installed a 3000W MP2. Last summer I had some issues with shore power at a marina in the Broughtons, which appeared to fry my Renogy 3000W inverter, hence pulled out the Renogy and the 25-yo charger and went with a Victron MP2,

Occurred to me that I would be even better protected from shore power issues by installing on isolation transformer, which I did, a Victron 3600W isolation transformer. Pretty straightforward wiring: input to iso transformer is shore power, output is my AC circuit breaker.

The installation manual for the iso transformer recommends a GFCI between the AC distribution panel and the load. This could be interpreted as placing a standalone GFCI (not a GFCI outlet) between the AC distro panel and the MP2 inverter/charger. Branch circuits in my AC system are already protected with GFCI outlets. Somehow, doesn’t seem right to me to put another standalone GFCI (again, not an outlet a standalone GFCI unit) between the output of the iso transformer and the input to the MP2.

Has anyone done a similar installation: SP–>ISO TRANSFORMER–>INVERTER/CHARGER? Did you use a standalone GFCI in front of the inverter/charger or go straight from the ISO transformer to the MP2?

Thanks.

2

As long as the ground of the isolation transformer and the inverter are securely bonded, the cable run from the transformer to inverter is fairly short (<3m) and goes to no other outlets or devices, then yes, an additional GFI between the transformer and inverter is redundant.
You have GFI’s on the output side so that is all good.

3

Thanks, Mike,

4

Mike,

That’s pretty much what I thought!

Clyde