Tacoma290
Active Member
Shark, you need to decide how you will be using the boat. We spend a lot of time on a mooring buoy and didn't have a generator. So battery capacity was a big deal on the house side.
I had 2 group 31 deep cycle on the house side and a group 27 dual purpose on the other side. My thought was that even if I ran the house down all the way (don't do it!), I could still turn over the other engine on the group 27 and use the solenoid switch to start the house engine.
Both sides were AGM to make life easier on the charger (battery chemistry should ideally match).
On my newer boat, I have switched from AGM to standard wet cell, since I want to have an excuse to be in the bilge periodically anyway. And buying a replacement battery is so much easier.
I had 2 group 31 deep cycle on the house side and a group 27 dual purpose on the other side. My thought was that even if I ran the house down all the way (don't do it!), I could still turn over the other engine on the group 27 and use the solenoid switch to start the house engine.
Both sides were AGM to make life easier on the charger (battery chemistry should ideally match).
On my newer boat, I have switched from AGM to standard wet cell, since I want to have an excuse to be in the bilge periodically anyway. And buying a replacement battery is so much easier.