Join Date: Mar 2006
Location: New England
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If they're going to be part of a single battery bank, then you really should get two of the same batteries to reduce problems caused by different charging/discharging rates. If they're going to be separate banks, then you can get a different battery, but I would stick with the same type of battery—if you have a wet cell, get another wet cell, etc...
75 Amp-Hours is a pretty small house bank, and unless you are running your engine all the time to re-charge the batteries or don't use much in the way of electronics, you probably want to get more capacity in your house bank.
It would help if you said what kind of boat you have as well as what kind of charging capabilities you have aboard—high-capacity alternator, wind generator, solar panels, etc.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.