I was considering using a bank of 6V golf cart batteries, either 4 or 6 in series/parallel configuration. Is there a disadvantage to having too many batteries?
It's tough to find affordable 12 volts with the plate structure the 6 volts have to take the true deep cycling. 6 volt golf cart batteries are also available everywhere whereas the higher quality 12 volt trojans and the like are a little more difficult to find.