how many leisure batteries do i need. i live aboard and like to watch telly on night, but im always worried about batteries going too low( below 12v on read out.) i also run a fridge 12v one. currently i have 3 leisure batts one is brand new other two not sure how old (was on boat when got it a year or so ago) should i have replaced all three? do i need more than 3 ? watched telly for couple of hours last night got up this morning the readout was on 11.90v, should it be alot more considering how nmuch use theyve had? and had run the engine for at least 3 hours with nothing on except fridge before hand.
help me plzzzzzzzzzzzzzzzzzzz