Cavie is on the right track......
Get rid of the 30-AMP GFCI Breaker in the panel in your house... that is very likely the source of the issue.
Before I installed a 30A RV panel for my coach, I would use an adapter to plug into the 20A outlet on my house that was a GFCI. All I was doing was letting the Converter / Charger maintain the battery and it would trip the GFCI randomly. When I plugged into a non-GFCI outlet, everything was fine.
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