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Discussion Starter · #1 ·
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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Discussion Starter · #2 ·
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.

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
http://evalbum.com/1328

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Discussion Starter · #3 ·
I don't believe Jack Rickard monitors the EVDL any more. You might ask in
the ThunderSky group.

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.

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
> > >
> > > _______________________________________________
> > > | REPLYING: address your message to [email protected]
> > only.
> > > | Multiple-address or CCed messages may be rejected.
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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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Discussion Starter · #4 ·
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
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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Discussion Starter · #5 ·
What I'd very much like to see is some real tests on very high
*charge* rates as it is this issue and the associated lack of
availability of widely available high power (level 3) chargers which I
think which is the main obstacle to main stream acceptance of the
whole EV she-bang. If you can say to people "Yes, drive for 2 hours,
charge (and have a coffee) for 20 minutes" then that completely
removes the range issue whether you are planning a long trip or just
get caught out locally.

TS's spec sheet says 3C charge is OK, what actually happens when you
do it? Lots of heat? Reduction in cycle life?...

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!

Regards, Martin Winlow
Herts, UK
http://www.evalbum.com/2092
www.winlow.co.uk



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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Discussion Starter · #6 ·
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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