Not sure what size batteries to use

[sleekcraft86]

Hi, I have a 25ft boat with twin 220 outbroard yamaha motors. I am not sure what size batteries would be best for me to run. It shows hook ups for two so I am assuming that is what is needed, but what size is best? I also would be running the stereo, there is a switch in the boat with 3 options, 1, 2 or all, can I also assume one is for the stereo ond other is for motors?

 

[Chris1956]

Re: Not sure what size batteries to use

You should get two 27 series batteries.

BTW - Normally two motors have two switches. If I had a twin motor set up, I would get two batteries and two switches. I would connect both switches such that the left battery is #2 on both switches. I would normally run with the port engine set to #1, and the starboard engine set to #2. If one battery goes bad, you can start the motor with the good battery.