The old boat had a couple of 4D's at 220 Amp each. The new boat is
currently using fairly standard 12 volt RV size batteries at 110 ratings
each. I'm thinking of going to the 6 volt variety as I have to go back up
to or near 400 Amp hours of storage. Which size, which voltage, and why?
If six volt are the fairly inexpensive one's from Costco (golf cart
batteries)useful or should I just spend the money at West Marine?

Tanks
Michael