Re: battery chargers
You need one or two large on-board chargers. Check right here on iBoats. If all of the batteries are in the same area of the boat, one large three bank would do the job. If the batteries are in separate areas, one single out for the start battery, and one two-bank charger for the accessory/inverter batteries would work and eliminate running lots of wire. Large three bank charges get spendy. A single and a dual with the same capacity would be less expensive and should one or the other take a dump down the road, replacement is again less expensive.
