Tuesday, May 3, 2022

Re: [electricboats] Thoughts on 12 volt Lifepo4 batteries

Hello, Skray,
Here's an idea.  I'm not sure it's a good one, so hopefully others here will chime in about its risks and flaws.
I've bought several 12 V 6 Ah LiFePO4 batteries on Amazon when they come up for $18-$20 each, delivery included.  I've tested them for capacity.  They've always been at least 90% of the claim.  For 36V 100 Ah, you'd need an array of 51 of these, which should set you back about $1k.  You could charge them simultaneously using fully isolated power supplies for each set of 17 in parallel.   There would be a lot of wiring.  To make the pack more compact, you could bust open the cases to access each set of 4 cells strapped to their management board individually.  But take care to remount them with enough space and materials between them to prevent fire propagation if one of them spontaneously shorts itself.
I haven't done this yet, but I intend to so something like this for my 3 hp outboard motor conversion project.
Cheers,
Halden
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