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Old 06-06-2005
Jonathan316 Jonathan316 is offline
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Mixing AGM and wet cell batteries

Small sailboat already has a new 80amp wet cell. Now the owner wants to add an Optima D34M AGM battery to the mix, giving him about 200 amps total.

I know you cannot hook dissimilar battery types in parallel, but is it OK to mix AGM and wet cell batts when using a Off-1-2-Both battery switch? When switched to ''Both'', are the batts effectively in parallel?

Also, he has a 9amp feed from the alternator on his small outboard which skipped the electrical panel and hooked straight to the wet cell for charging. How can that still be used in the new setup?

Any advice would be appreciated. I cannot talk him out of choosing between one or the other batts; he is set on using them both for his house system. I know I can isolate each bat completely but would prefer to figure out some sort of mixed system.
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