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Old 05-31-2013
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Re: Shore GFCI trips when plugging in boat

When dealing with a GFCI you are talking milliamps. Somewhere around 5 milliamps leaking to ground will cause the GFCI to trip. If no one else had a problem with the GFCI receptacle then it has to be your connected load which is at fault. As I stated above it seems that your charger is the problem. Even though your inverter function is turn off the grounded neutral may not be disconnected and that is sufficient to trip the GFCI. That should be checked out and changed. When connected to shore power without GFCI protection the ground fault will not show up as a problem. It is however a violation of the electrical code since the neutral may only be grounded once. Since the supply neutral from the shore power is already grounded by grounding in the inverter you have grounded the neutral second time. This is not a problem when you are not on shore power and are operating on inverter alone. The second grounding of the neutral has the potential of tripping your boats main breaker. Although rare, it can happen because your neutral is caring the unbalanced load which can be in excess of the breaker capacity.
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