|
|
 |
|
|
|
|
| Ev Archive for May 2001 |
 |
| 1845 messages, last added Wed Aug 08 18:52:09 2001 |
[Date Index][Thread Index]
Re: dump charging
This will only put about 10 percent of the charge in the battery.
You need more voltage to charge them more fully.
How fast do you want to charge?
The answer to that will determine how many amps you need.
The amps will be governed by the difference in pack voltage divided by the
wiring resistance.
Don't forget to use the charging voltage of the battery being charged (~28
volts) and the discharge voltage of the dump pack (~36 volts for three
batteries in series).
Using three batteries in the dump pack and using a 100 foot #10 extension
cord you will get ~40 amps. (36-28)volts /.2 ohms. If you try this, do not
keep the cord rolled up. It will need to dissipate 320 watts of heat and
will get rather warm strung out or melt if coiled.
Joe Smalley
Rural Kitsap County WA
Fiesta 48 volts
NEDRA 48 volt street conversion record holder
joes@worldfront.com
----- Original Message -----
From: "Gerdy Corriveau" <zwrench@usa.net>
To: "EV list" <ev@listproc.sjsu.edu>
Sent: Thursday, May 31, 2001 12:08 PM
Subject: dump charging
> This sounds interesting and I'd like to try it.
>
> Let's see if I understand correctly.
>
> The mobile battery pack to be charged is 2 33amp/hour AGMs in series.
> Could the charging pack be something like 2 large automotive (group 24 or
31)
> starting batteries in series.
>
> Connect to mobile pack in parallel using 0 guage cables and control with a
big
> contacter. 200 amp ammeter and shunt plus a voltmeter.
>
> Close the contacter and wait for the current to taper off??? Is it that
> simple? How close to full charge can this get me? How long will it take?
>
> ____________________________________________________________________
> Get free email and a permanent address at http://www.netaddress.com/?N=1
>
>
|
|
|
|
