Re: Shore GFCI trips when plugging in boat
The GFCIs downstream of the fault would not trip.
You may be able to troubleshoot this with a DVM that captures the maximum reading. An O-scope would be even better, but probably not at your disposal. Look for any AC voltage reading between AC ground and neutral at the inverter/charger when it is off, then test again when you turn it on. Run this test again looking for DC voltage.
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USCG Licensed OUPV Captain, ASA 101/103/104/105 Certified - Also certified in Recreational Marine Electrical Systems