I have a 24'
power boat with a 250 HP
outboard. I have two
batteries with a combination of three
battery switches. I have port
battery off & on, a starboard battery off & on and a parallel switch. I have a group 24 and a group 31 battery. I can isolate them for overnight
anchoring, but the majority of the time they are paralleled. I've been recently told that both
batteries should be the same size and quality as the smaller one can actually pull the larger one down and could become quite hot. Anybody with a lot of battery experience have any opinions on this. I've had this similar set-up on a lot of boats over the years, both
power and sail. Any help will be greatly appreciated. Thanx