mount battery in bilge floor? - Page 2 - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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  #11  
Old 10-18-2013
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Re: mount battery in bilge floor?

Ditto. Build a good sturdy box with 2" high sides that fit right around the battery(ies)from plywood and completely glass it with heavy tabbing up onto the inside of the hull. Batteries are heavy so when heeling over and getting bounced around, they need to stay put. You can fit a 1/8" x 2" padded s.s. strap to hold them down much the same as a typical car battery is held down.
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Old 01-05-2014
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Re: mount battery in bilge floor?

What are the Marine requirements? In a newly freed up area, I have to put four large 12 vdc lead/acid batteries. Would using 4 "tie downs" only, be acceptable? Or do the tie downs (rectangular collar) have to be in a closed boxes?
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Old 01-05-2014
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Re: mount battery in bilge floor?

Glue won't stick to a battery box, but that's why boxes are usually strapped down. You can generously glue down some battens, and then strap or bolt (or both) the plastic box down to them. You want whatever job you do to be strong enough, and rigid enough, so that you literally can roll the boat over without the battery shifting.

The bigger issue may come back to "what kind of battery do you have". The criteria here is "wet lead acid" or "sealed" because when salt water gets into the bilge, if it gets into a plain wet lead acid battery it will combine with the electrolyte and give off large amounts of chlorine gas. Which is very good at burning out eyes, throats, and lungs in very short order.

So personally? I wouldn't put an unsealed battery in a bilge space, at all.
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Old 01-05-2014
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Re: mount battery in bilge floor?

They should be installed in such a way that they cannot move in any direction - ABYC allows 1" movement but no movement is better. They should be either in acid proof boxes or at the very least in acid proof trays. If the compartment is closeable lids aren't required, but the posts should be covered.

I agree the bilge in most boats is not a good place for flooded batteries.
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