I installed a main larger circuit breaker in the battery box itself. And then a power wire goes from there to the control panel. And at that control panel, I have every circuit breaker-ed with a proper size from there. So every circuit in the boat has as a minimum two circuit breakers. That way no over-loaded wire can start a fire. But at least one breaker or fuse should be installed for every circuit regardless where that wire goes. Like I've stated many times before, if you have a fire on a boat, there is nowhere to run when you are out on the water! JMHO