Jack Murray <[email protected]> wrote:
> Has anyone done cycle life tests on thundersky cells?
> I'm interested in particular at 1c, 2c, 3c.
> They only spec them at .5c
>
> I seem to recall Manzanita did some, or maybe Morgan ?
>
> Jack Murray
> Nimble Motorsports
>
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--
David D. Nelson
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Jack Murray <[email protected]>wrote:
> Thanks for the reference.
> Jack Rickard just published data obtained from the battery salesman,
> but did not do any tests himself, according to what he "typed in".
> Mr. Rickard, did you do 3C tests yourself? There is no basis to assume
> charts are linear and can be extrapolated.
> The capacity might fall off a cliff at cycle 623.
>
> Jack Murray
>
>
> "One of the most fascinting things I got from him was an actual .XLS
> spreadsheet listing the AH values from 500 cycles of testing for what they
> term "attenuation" or the decrease in capacity over time from cycling the
> cells. I got one of these for the 180AH cells and one for the 100AH cells,
> with two cells tested and the actual values. I've prepared a couple of
> simple graphs from this data."
>
>
> --- On Sun, 2/27/11, David Nelson <[email protected]> wrote:
>
> > From: David Nelson <[email protected]>
> > Subject: Re: [EVDL] Thundersky Cycle Life Tests
> > To: "Electric Vehicle Discussion List" <[email protected]>
> > Date: Sunday, February 27, 2011, 9:31 AM
> > Here is some data for CALB cells over
> > 500 cycles
> >
> http://jackrickard.blogspot.com/2010/06/life-in-lifepo4-cycle-life-and.html
> >
> > Scroll down the page to see the charts.
> >
> > On Sunday, February 27, 2011, Jack Murray <[email protected]>
> > wrote:
> > > Has anyone done cycle life tests on thundersky cells?
> > > I'm interested in particular at 1c, 2c, 3c.
> > > They only spec them at .5c
> > >
> > > I seem to recall Manzanita did some, or maybe Morgan
> > ?
> > >
> > > Jack Murray
> > > Nimble Motorsports
> > >
> > > _______________________________________________
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> > only.
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> > >
> >
> > --
> > David D. Nelson
> > http://evalbum.com/1328
> >
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> >
>
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--
David D. Nelson
http://evalbum.com/1328
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David Nelson wrote:
> I agree about the extrapolation of the data. It could fall off or taper out.
> I'd guess that it is more likely to fall off.
Same here. Lots and lots of batteries have shown a distinct "cliff" at
some point in their life, where capacity suddenly falls.
--
Lee A. Hart | Ring the bells that still can ring
814 8th Ave N | Forget the perfect offering
Sartell MN 56377 | There is a crack in everything
leeahart earthlink.net | That's how the light gets in -- Leonard Cohen
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Lee Hart wrote:
> Jack Murray asked:
>>> Has anyone done cycle life tests on thundersky cells? I'm interested
>>> in particular at 1c, 2c, 3c. They only spec them at 0.5c... Jack
>>> Rickard just published data obtained from the battery salesman,
>>> but did not do any tests himself, according to what he "typed in".
>
> I'd like to see such data as well. I think we're *all* very interested
> in seeing *independent* life test data, rather than accelerated life
> tests from the manufacturer. I've been lied to far too many times by
> battery salesmen to accept their data without confirmation. :-(
>
> David Nelson wrote:
>> I agree about the extrapolation of the data. It could fall off or
>> taper out.
>> I'd guess that it is more likely to fall off.
>
> Same here. Lots and lots of batteries have shown a distinct "cliff" at
> some point in their life, where capacity suddenly falls.
> --
> Lee A. Hart | Ring the bells that still can ring
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Martin WINLOW <[email protected]>wrote:
> Beyond that, it would be nice to be able to fit the necessary hardware
> to use the chargers in our DIY vehicles. But I guess we have to wait
> for the chargers first - and I'm thinking a Level 3 charger is not
> going to be a DIY option!
>
I've charged lithiums at 1C which is quite fast enough IMHO!
The CHAdeMo DC charger can be utilised for DIY vehicles with some effort, by
the way.
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