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Old 06-17-2006
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Question Space constraint for starter battery?

My house bank of four deep cycle batteries allows for space for my dedicated starter battery sufficient only for a standard "golf cart size" battery. Problem occurs that the single smaller dedicated battery isn't sufficient to turn the westerbeke 46 by itself. Knowing that we aren't supposed to mix gel cell and deep cyle if they are on separate circuits is it acceptable to use a single gel cell (much higher cca for the size) or should I not mix battery types at all regardless of the way they're wired?

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Old 06-17-2006
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If the starting battery is on a separate charging circuit from the deep cycle batteries, it should be relatively safe to use different battery types. The real danger of mixing battery types is from the different discharge/recharge rates and voltage levels—which can cause accelerated battery aging and may be a possible fire or explosion hazard.

That said, I do use AGM batteries for my starting batteries, and deep cycle batteries for my house bank. I would like to point out that I do have the batteries on separate circuits, and the two banks have separate charge controllers, set to different voltages, set for what is optimal for the different battery types.
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Last edited by sailingdog; 06-17-2006 at 08:08 PM.
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