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post #1 of 3 Old 06-20-2010 Thread Starter
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Adding a third Battery to House Bank

Hi, I have a quick question. In my new-to-me C36, one of the batteries in the house bank had a bad cell. I figured, why not replace them both, which I did. Since this new-to-me boat has refrigeration, radar, and everything else, I thought I would add one more battery to the house bank, especially when the first two are brand-new.

The batteries are group 27 deep-cycles, with 105 amp/hours, giving me a bank of 210 amp/hours. Adding a third would give me anothe 105 amp/hours to play with.

Now the question. If I combine two batteries that are located next to each other in parallel, you use the positive from one battery and the negative from the other for the leads, correct?

Thanks, Bill

BTW, went sailing with the family today for Father's Day. 15 knots of wind, sun, fantastic. Love the new boat!

Odyssey, '79 CSY 44 Cutter
Channel Islands, CA


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post #2 of 3 Old 06-20-2010
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I would go with Group 31s if they will fit. Group 31s aren't much bigger than Group 27s, but give you a fair bit more energy.

As for wiring... you connect the positive of one to the positive of the other and the negative of one to the negative of the other, since they need to be IN PARALLEL. Then you connect the positive of the first to the battery switch and the negative of the second to the ground bus bar.

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post #3 of 3 Old 06-21-2010
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Try this: The 12volt Side of Life (Part 1)

Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)
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