The power going out sounds like a bad circuit breaker up by the batteries, tripping then resetting.
Depending on usage you may have to charge batteries everyday.
The breaker will
A) trip if overloaded.
Or
B) is bad and needs replaced.
Sounds like you may have a big draw.
With no shore power .
Fridge requires 12 v
Water heater requires 12v
Water pump requires 12 v
Lights
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