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Re: [EVDL] Phd in Materials Science on LiFePO4 batteries video WAS: Lithium 60ah 144v

On 14 Dec 2010 at 20:42, AMPhibian wrote:

> I just think we'll get more bang for the buck by pushing for more closely
> matched cells, even if we have to pay extra, than paying for a monitoring
> system which doesn't actually fix the problem of mismatched cells.

That was part of Solectria's secret for getting 4-6 years of life out of gel
batteries in the Force. They used batteries with very tight manufacturing
tolerances, instead of using equalizers or a BMS.

They did fit some cars with a BMS, but I think it was mostly when they were
using Hawkers prior to adopting the East Penn / Sonnenschein gel batteries.

But then look at Lee Hart's experience. He got something like 10 years out
of a pack of AGMs with his balancer.

I also think you're going to have trouble finding highly consistent lithium
cells, unless you're willing to play MUCH more - as in several times more -
than the Chinese lithiums go for. But I could be wrong.

David Roden - Akron, Ohio, USA
EVDL Administrator

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