Years ago living in a marina on the Chesapeake Bay
I installed a second 30 amp service
on my Cruising Cal
35. The reason for the independent service
was to put all of the large resistive loads (hot water
heater, cube heaters, oil
radiator heaters) on an independent circuit.
I had recently installed a freedom 10 inverter
and was concerned that if dock power went off one of these could drain the batteries if accidentally left on when leaving the boat.
In addition, at the time most shore pedestals in the Chesapeake Bay
were single or dual 30amp service with unknown phase relation. One would often find hot and neutral swapped, etc. Single 50amp 125 plugs were very rare as we're 50amp 125/250 plugs.
In addition there had been some boat fires in the area from boat AC wiring
which was not up to handling continuous 15 amps to a socket. Many boats came badly wired from the factory.
My physically separate second AC panel was run with #10 wire from the inlet to panel, then one breaker for each load or new gfci outlet. All run in #10 wire.
The goal was a bulletproof resistive loads circuit that if shore power went away would not power those loads.
Hot and neutral were obviously physically separate, each ground had an independent galvanic isolator
before going to ships ground.
I did have a 30 amp splitter to two 30 amp plugs for summer use where I would use one 30 amp cord and split at the boat to run the hot water heater.
System was very robust and worked well.
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