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Old 04-01-2025, 08:27   #16
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Join Date: Sep 2019
Location: Lifeaboard
Boat: FP Lavezzi 40
Posts: 4,299
Re: Thoughts for making a 24v lifepo4 outboard battery as small as possible.

Quote:
Originally Posted by Fuss View Post
Good point, dry bag is not good for carrying but if I put it first in a dry bag first and then the cool bag, it would be completely waterproof and insulated from the sun and able to be carried.
Best is airgap insulation so simply make a case in the case with 1 or 1.5cm airgap an use hollow alu square tube or stiff foam as spacer. The outside you simply make out of 5 or 10mm nylon boards or 3D print a case and Anderson plug or route a long cable out with watertide fitting. Also easiest to carry and strapped down in the dingy. Or use a hardcase small cooling box, soft bags are not handy.

I use for portable 280Ah batteries the https://www.milwaukeetool.com/products/48-22-8422
It's already IP65 rated but can easily modify it waterproof, it's partially hollow and isolates well. 4x280-316AH cells and a JK BMS fit perfectly and an Anderson plug or any other connector/terminals you like.
You could maybe also fit 1p8S or 1p16S with smaller cells in it too.
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