SailNet Community - View Single Post - Battery Charging Assistance
View Single Post
  #5  
Old 06-01-2012
asdf38's Avatar
asdf38 asdf38 is offline
Senior Member
 
Join Date: Jul 2010
Posts: 631
Thanks: 1
Thanked 3 Times in 3 Posts
Rep Power: 4
asdf38 is on a distinguished road
Re: Battery Charging Assistance

That all sounds good to me. I think the easiest way to sum things up is to say that the batteries should only be on All or Both when they are charging. Any other time combining dissimilar batteries means that one battery will end up charging the other. This just wears them both down over time. It's probably ok to start from all/both only if you're trying to save time or avoid forgetting to switch to all/both after the engine is running. But it's probably ideal to avoid combining batteries until after the engine is running.

That said, dealing with the switching is a big pain. A great upgrade is a battery combining relay, or an echo charger (I just installed a relay). Lots have been written about them here. Both serve to effectively combine the batteries automatically when the alternator is running. This means that if you can start off the house bank (you nearly always can) then you can avoid switching at all. Just switch to house motor, sail, motor - no switching. The starter battery is just there in-case you leave the lights on and kill the house.
__________________
1979 Contessa 26
Boston, Ma
Reply With Quote Share with Facebook