Could you clarify where the 15 amp breaker is? On your boat panel? Is this the same circuit as the heater was/is connected to? The heater does it have a fan or just the wire that glows?
Leakege to ground is not good. The two circuits ( ground and neutral ) should be isolated from each other all the way back to the main electrical service. With the corrosive environment involved it is not hard to understand why there are problems. Proper maintenance of the electrical system ( maria and yours ) should eliminate this problem.
it's an all new shore power system. the panel is a blue sea model with two breakers: a 30 amp main and a 15 amp branch breaker. the shore power plug is right in back of my breaker box so the distance between it and the panel is less than a foot worth of wire. all the wire gauges were chosen in compliance
with what's recommended for the loads....erring on the big side where it was close.
i have been using it for heat battery charging, and power tool for a few months, now, with no issues.
the heater was plugged into the 15 amp circuit. i have two plugs on that line (a distance from each other chosen specifically to allow me to place the heater at different points).
when i got to the boat my battery was way down so i couldn't turn on the lights, as i usually would at night. i had to use the led lantern i used to use before i installed the lights and it wasn't as bright inside i think and that's how i noticed the reverse polarity light was lit. it was dim and i had to check to make sure it was actually on, at first.
when i flicked off the 15 amp breaker, the reverse polarity light went out. turned it back on and the reverse polarity light came back on.
i plugged my phone charger into the socket and it worked just fine. the heater was also working just fine.
i unplugged my phone charger but, not the heater, and plugged in the battery charger. instead of the needle tanking at maximum charge, which is what should have happened, it bounced up and down rapidly. so, i unplugged it. i wish, now, that i had tried it with the heat off. going to do that today.
the heater has no blower. it's an oil filled radiator type...and i had it on maximum. since it has no blower, the full wattage (which is the same draw as my previous ceramic heater) goes into heat. it won't heat instantly but it keeps the boat much warmer inside than the ceramic heater with a blower.
the green and white wires make no connections, except the reverse polarity light which blue sea wired up, on board my boat. if there is a connection made, it's at the dock. i know not to do that and there is no chance it happened do to shoddy work. i am quality minded bordering on the obsessive.
that's all the details i can think to tell. i know the marina hasn't done any work on the electricity. the one thing not the best about them is that they are slow to get stuff done
i had thught that it might be something caused by the weather. we have had a bit of rain and freezing rain, lately.
now, i'm thinking it's nothing to worry about but, i want to be sure.