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2 - 12 volt batteries in parallel


Big Dave2

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I want to hook up 2 12 volt batteries in parallel this weekend to make sure I have enough duration. Can I just set the 2nd battery next to the rv battery and run a wire from the red to the red and one from the black to the black?

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17 minutes ago, Big Dave2 said:

I want to hook up 2 12 volt batteries in parallel this weekend to make sure I have enough duration. Can I just set the 2nd battery next to the rv battery and run a wire from the red to the red and one from the black to the black?

That's more or less what I did on my last Motorhome. Went all the way to Yellow stone in the spring using the heater, frig, and VCR and never lost power.

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I know the is a little late in the game, but I have to series 29 batteries in a box that I cobbled together from 2 battery boxes and leave them that way all season.  The few exra $$ is little compared to not have to worry about running out of juice over a weekend, especially a rainy weekend where you spend more time in the RV.

 

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Just wire them up now so they share the load instead of having one battery that does all the work and one that sits there. They will charge and discharge together. If you want to keep them seperate, you can buy a marine battery switch that lets you disconnect one or both of the batteries as needed. 

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