on board charger

[floatman]

I agree with Big T. Unless you use a lot of electronics and run your boat engine very little, practically every engine made in the last 15 to 20 years will keep your starting battery sufficiently charged without the aid of an on board charger.

I agree with sweetwater if you have a outboard that has a alternator, I have a 1993 200hp Mercury and it has rectifiers and will supply some juice back to the starting battery, but not to keep it charged, I would get a 3 bank.....JMO

Gary