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  #11  
Old 07-21-2012, 11:57 PM
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Default Re: [EVDL] And yet another floodie to CALB?/Lithium longevity.

[quote]Lee Hart wrote:
>> Why not try just a few lithiums in series with the rest of a
>> lead-acid pack... When you charge, use a BMS to prevent the
>> lithiums from overcharging. Give it a year, and see how well the
>> lithiums are actually performing.

Steve Clunn wrote:
> I did something like this with one cell added to my lead acid pack
> just to see how it would do. I quickly noticed that the lithium
> cell needed less ah put back in than the Hawker lead acid. I
> don't think the battery management or something that shuttles an
> amp is going to be enough, the lead acid batteries will not get
> enough ah to get charged.

That makes sense. The BMS would have to be able to bypass however many
amphours were needed to finish charging and equalizing the lead-acids.
The little sub-amp BMS boards can't do it. It would require something
that can handle whatever your charger's finishing current is. If you're
running 6v golf cart batteries, that could be 5 amps!

> You could use a separate charger for your Lithium cells.

That would be a better option for a charger with a high finishing current.

--
Results! Why man, I have gotten a lot of results. I know several
thousand things that won't work. -- Thomas A. Edison
--
Lee A. Hart http://www.sunrise-ev.com/LeesEVs xxx@xxx.xxx

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  #12  
Old 07-26-2012, 05:35 AM
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Default Re: [EVDL] And yet another floodie to CALB?/Lithium longevity.

[quote] Peter C. Thompson <xxx@xxx.xxx>wrote:

> I've been driving my Porsche 914 as a daily driver since April 2010. I
> currently have 5500 miles on the batteries. Round-trip is 36 miles -
> but I don't drive the electric car every day. The batteries are CALB
> 60Ah (108 of 'em).
>
> So far, the batteries do not seem to be drooping, but that's only 2
> years worth of driving. At least it is a data point for you.
>

Another one: 2.5 years, 34k miles on CALB 180AH - I use about 1/2 the
capacity on my commute, obviously more on occasions.
Has survived one severe winter in use at -10 without heating or insulation.
No noticeable change in voltage sag or range since new, although I admit
I've never tried to push it to the ultimate range (somewhere over 100
miles).
My car can only pull 1.5C though, which might help.
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  #13  
Old 07-26-2012, 08:06 AM
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Default Re: [EVDL] And yet another floodie to CALB?/Lithium longevity.

I do believe average C-rate and maximum C-rate should be kept as low as
possible for long battery life. This means big batteries or lots of them
and preferably both.

[quote] Evan Tuer <evan.xxx@xxx.xxx> wrote:

> On Sat, Jul 21, 2012 at 4:45 AM, Peter C. Thompson <xxx@xxx.xxx
> >wrote:
>
> > I've been driving my Porsche 914 as a daily driver since April 2010. I
> > currently have 5500 miles on the batteries. Round-trip is 36 miles -
> > but I don't drive the electric car every day. The batteries are CALB
> > 60Ah (108 of 'em).
> >
> > So far, the batteries do not seem to be drooping, but that's only 2
> > years worth of driving. At least it is a data point for you.
> >
>
> Another one: 2.5 years, 34k miles on CALB 180AH - I use about 1/2 the
> capacity on my commute, obviously more on occasions.
> Has survived one severe winter in use at -10 without heating or insulation.
> No noticeable change in voltage sag or range since new, although I admit
> I've never tried to push it to the ultimate range (somewhere over 100
> miles).
> My car can only pull 1.5C though, which might help.
> -------------- next part --------------
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> http://lists.sjsu.edu/mailman/private/ev/attachments/20120726/61d6dbb4/attachment.html
> _______________________________________________
> | Moratorium on drag racing discussion is in effect.
> | Please take those discussions elsewhere. Thanks.
> |
> | REPLYING: address your message to xxx@xxx.xxx.edu only.
> | Multiple-address or CCed messages may be rejected.
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>



--
Marcus Reddish

*North Valley Systems LLC*
Stevensville, Montana
406-360-8628
northvalleyev.com
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  #14  
Old 07-26-2012, 11:35 AM
EVDL List EVDL List is offline
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Default Re: [EVDL] And yet another floodie to CALB?/Lithium longevity.

I just took one car for routine checkup. EV odo 80.000 km and with LFP
since 2005. Will test the capacity of the cells since the car has been
working like a clock.

I put up some pics at FB site.

https://www.facebook.com/TransitionCompany

-akkuJukka

http://www.google.com/profiles/jarviju#about


2012/7/26 Marcus Reddish <marcus.xxx@xxx.xxx>:
> I do believe average C-rate and maximum C-rate should be kept as low as
> possible for long battery life. This means big batteries or lots of them
> and preferably both.
>
> [quote] Evan Tuer <evan.xxx@xxx.xxx> wrote:
>
>> On Sat, Jul 21, 2012 at 4:45 AM, Peter C. Thompson <xxx@xxx.xxx
>> >wrote:
>>
>> > I've been driving my Porsche 914 as a daily driver since April 2010. I
>> > currently have 5500 miles on the batteries. Round-trip is 36 miles -
>> > but I don't drive the electric car every day. The batteries are CALB
>> > 60Ah (108 of 'em).
>> >
>> > So far, the batteries do not seem to be drooping, but that's only 2
>> > years worth of driving. At least it is a data point for you.
>> >
>>
>> Another one: 2.5 years, 34k miles on CALB 180AH - I use about 1/2 the
>> capacity on my commute, obviously more on occasions.
>> Has survived one severe winter in use at -10 without heating or insulation.
>> No noticeable change in voltage sag or range since new, although I admit
>> I've never tried to push it to the ultimate range (somewhere over 100
>> miles).
>> My car can only pull 1.5C though, which might help.
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>> URL:
>> http://lists.sjsu.edu/mailman/private/ev/attachments/20120726/61d6dbb4/attachment.html
>> _______________________________________________
>> | Moratorium on drag racing discussion is in effect.
>> | Please take those discussions elsewhere. Thanks.
>> |
>> | REPLYING: address your message to xxx@xxx.xxx.edu only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | CONFIGURE: http://lists.sjsu.edu/mailman/listinfo/ev
>>
>
>
>
> --
> Marcus Reddish
>
> *North Valley Systems LLC*
> Stevensville, Montana
> 406-360-8628
> northvalleyev.com
> -------------- next part --------------
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> | Please take those discussions elsewhere. Thanks.
> |
> | REPLYING: address your message to xxx@xxx.xxx.edu only.
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