DIY Electric Car Forums banner

1 - 2 of 2 Posts

·
Registered
Joined
·
70 Posts
Discussion Starter #1
Took the MetroLectrical (aka the Gzero) in for its inspection with the new
LiFePO4 cells this weekend, and it passed with no problems. This was also
the car's first outing, which involved the dreaded 1700-ft, 5-mile ascent
to get back home. I'm really amazed at how good the new cells are compared
to the old lithium-cobalt pack. The old pack had two parallel strings of
35 cells each, for the equivalent of 290Ah at 126V nominal. Coming up that
hill, though, the car could barely make it, with a fully-charged pack
sagging from 140V to 88V and the cells heating up to over 60 degrees C by
the end. In contract, all I've got in the car right now is a single string
36 100Ah LiFePO4 cells under the hood, yet the car zips up that hill with
no problem. Pack sags only from 120V to 105V on the steepest part. And
when I get home, the cells are barely even warm to the touch. I'm very
pleased.

I have a question. This new pack gives me about 40 miles range, but to
increase that to 120 miles, I've been planning to re-install 30 of the
200Ah cobalt cells in parallel with the new LiFePO4 cells. This will add
about 375 lbs. to the car. But since those cobalt cells won't be able to
put out much amperage without sagging, I'm wondering if anyone has any
thoughts about how it will affect the hill climb. Will the extra amps
provided by the cobalt cells offset their added weight, or will the car
labor more during the ascent?

Thanks.

Bill

--------------------------------------------------------------------
mail2web - Check your email from the web at
http://link.mail2web.com/mail2web



_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #2
What brand of LiFePO4 batts did you go with??

Joseph H. Strubhar

Web: www.gremcoinc.com

E-mail: [email protected]


----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Monday, October 04, 2010 10:48 AM
Subject: [EVDL] Gzero Report


> Took the MetroLectrical (aka the Gzero) in for its inspection with the new
> LiFePO4 cells this weekend, and it passed with no problems. This was also
> the car's first outing, which involved the dreaded 1700-ft, 5-mile ascent
> to get back home. I'm really amazed at how good the new cells are
> compared
> to the old lithium-cobalt pack. The old pack had two parallel strings of
> 35 cells each, for the equivalent of 290Ah at 126V nominal. Coming up
> that
> hill, though, the car could barely make it, with a fully-charged pack
> sagging from 140V to 88V and the cells heating up to over 60 degrees C by
> the end. In contract, all I've got in the car right now is a single
> string
> 36 100Ah LiFePO4 cells under the hood, yet the car zips up that hill with
> no problem. Pack sags only from 120V to 105V on the steepest part. And
> when I get home, the cells are barely even warm to the touch. I'm very
> pleased.
>
> I have a question. This new pack gives me about 40 miles range, but to
> increase that to 120 miles, I've been planning to re-install 30 of the
> 200Ah cobalt cells in parallel with the new LiFePO4 cells. This will add
> about 375 lbs. to the car. But since those cobalt cells won't be able to
> put out much amperage without sagging, I'm wondering if anyone has any
> thoughts about how it will affect the hill climb. Will the extra amps
> provided by the cobalt cells offset their added weight, or will the car
> labor more during the ascent?
>
> Thanks.
>
> Bill
>
> --------------------------------------------------------------------
> mail2web - Check your email from the web at
> http://link.mail2web.com/mail2web
>
>
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 
1 - 2 of 2 Posts
Top