[Oeva-list] New to EVs

John RA Benson jrab at e-m-w.com
Fri Jun 10 16:16:31 PDT 2005

I was curious about the amp delivery potential of 6v vs 12v batteries. My
Porsche used to be 20 6V US125's for 120V with a 235 amp hour rate. I was
always disappointed that, despite having a controller that could use 500
amps, the most the meter would tell me was being drawn was about 350, and
only momentarily. I thought it had to do more with wet cells that the
voltage. The nicads seemed to deliver more, but I lost a lot of range due to
only having a 100 amp pack, and they really needed to be limited to 250 amps
tops for limited periods or they'd get hurt.

Right now, it's sitting is storage awaiting a new pack while I'm out of the
country. 12v agms of some sort seem to be in it's future.

So it's more a case of higher voltage than wet or AGM when it comes to the
battery for amp delivery?


On 6/10/05 4:01 PM, "Chris Brune" <csbrune_ev at comcast.net> wrote:

> I might suggest that you find one of the online EV calculators.  You could
> use this to get an estimate of the performance based on the voltage and
> motor combination that you come up with.
> Try starting here:
> http://www.geocities.com/CapeCanaveral/Lab/8679/ev.html
> Keep in mind that the 6V batteries really probably don't want to deliver
> currents over 300-400 amps.  By having a low voltage system you will be
> putting a higher stress on the batteries.
> Also check out www.evalbum.com There could be some examples of 72V vehicles
> in there.
> Chris Brune
> ----- Original Message -----
> From: "Andre Susanto" <andreosae at yahoo.com>
> To: <oeva-list at oeva.org>
> Sent: Wednesday, June 08, 2005 2:52 PM
> Subject: Re: [Oeva-list] New to EVs
>> The brat is around 2200lb curb weight.  We're looking
>> to make an urban commuter where the user is in a small
>> town, the long end of the town is 3 miles and speed
>> limit is 35mph max.  There is a small stretch of
>> highway the user will need to drive to get to work,
>> but can be avoided via back roads.  So if I reduce the
>> top speed to say 35-40mph, would 72V be a decent
>> performer?
>> The goal for the vehicle is for range, with decent
>> performance (say like a Geo Metro).  The Brat was
>> selected because he does carry some dirty tools he'd
>> like to throw in the back.
>> Cost is another concern and I'll definitely be looking
>> into the parts and resources you guys have given me.
>> Thank you, and please keep the suggestions in.
>> Andre S
>> Andre Susanto
>> http://www.vikingracing.net/andre
>> andres(AT)email(DOT)sae(DOT)org
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