Batteries

Jrato14

Seaman
Joined
Apr 13, 2024
Messages
67
I have 31 ft Larson cabrio with twin 5.0 gxi. I have two batteries that are wired parallel with a charger. My question is I have an extra battery should I wire it in a parallel with the other two to have three batteries or am I better off with two.
 

flashback

Captain
Joined
Jun 28, 2002
Messages
3,817
I suppose you can get as fancy as you want, but I would get a battery switch at least to separate one of them.
 

FunInDuhSun

Chief Petty Officer
Joined
Apr 25, 2010
Messages
446
Ideally, you want a “starting” battery for each engine, connected thru switches capable of directing power to either (or both) engines.
A third battery is typically used as a “house” battery, which would be used to run any 12V equipment when at anchor. This allows both of the starting batteries full power when needed.

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There are many types of chargers out there. Often they will have the ability to charge 2, 3, or even 4 batteries (banks) at a time when connected to shore power. The multi-bank chargers do not interconnect the batteries, only charge them. That’s why switches are important.
 
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