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Old 23-06-2019, 01:33   #1
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Join Date: Jun 2013
Location: Cornwall, UK
Boat: Endurance 35 Ketch
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Electric Vehicle batteries

I was just wondering if anyone had given any thought to using secondhand EV batteries as a source of house batteries? (along the lines of a Tesla powerwall)
There seem to be a growing number becoming available from low milage EV's that have been written off by insurance companies after RTAs.
I'll be honest I haven't looked in too much detail, but from my limited knowledge I believe that they are constructed from a large number of small cells wired in series to deliver 60volts to a block and then a number of blocks are wired in series to produce around 300V output. I should have thought it would be reasonably straight forward to re wire the cells in to 12v blocks? Reason I ask is that for the same AH second hand EV batteries seem a lot cheaper than new lithium batteries.

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Old 23-06-2019, 06:09   #2
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Re: Electric Vehicle batteries

I'm sure people have done it. For me, the key question is whether the cells are LFP vs something else. I'm not up to speed on what cars use what, but I know many are not LFP. I think LFP is the only formula suitable for use on a boat because of safety and fire resilience.

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Old 23-06-2019, 07:24   #3
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Re: Electric Vehicle batteries

Have a look at this existing thread: Tesla House Battery
Tesla House Battery
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Old 23-06-2019, 10:02   #4
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Re: Electric Vehicle batteries

I don't know any mainstream production vehicles using LFP, their lower energy density is an issue.

The LI chemistries they do use are much more risky (boom bad on a boat), and are protected in the vehicle by sophisticated thermal protection systems that would be a real challenge for most of us to replicate.

IMO LFP is the only non-lead chemistry that a DIYer should consider for use within a small enclosed living space.

LTO is worth some bleeding edge experimenting, but only on land out in the back shed to start with.
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Old 23-06-2019, 10:30   #5
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Re: Electric Vehicle batteries

Sailing the Space Between couple have used Chevy Volt presently and I think Fiat batteries in the past - they're posters here, but can't recall the username.

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batteries, electric

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