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Old 08-13-2010
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I would install a battery switch/selector so that your system wasn't always energized. Besides the safety factor of not having everything "live" on the boat when you aren't around, humidity and/or salt have funny ways of creating low draw shorts that can kill your batteries in pretty short order. You also have the added benefit of keeping you batteries independent (a bad cell in one battery will kill both batteries if they are wired together). You will have to add a second solar panel, however; or a battery charge controller capable of handling two banks.
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