Looking for what has been done for replacing the factory battery charger... I have the factory battery setup, 4 group 31's and a 5th for the bow thruster... the stock charger (intelli-power 30A, model pd2030, 3 bank) has been turning itself on/off, connections to it have been checked... I think its time to replace. I spend alot of time on a mooring and typically run the genny 1.5hrs in the am and 2hrs in the evening to charge batt's and get hot water... Should I stay with a 30Amp? or jump up to a 40amp?