Re: A simple question - beginner stuff

[russell239@juno.com]

On Sun, 30 May 1999 22:28:33 -0400 John Penney <jpenney@tiac.net> writes:
>Hi all
>
>    I have a simple question about a small home-built ev that I'm 
>trying to use
>"consumer" parts for as an off-the-shelf build-it-yourself experiment 
>- if you have a
>charge circuit that is normally used for (and therefore I assume 
>designed for) charging
>1 12V battery, what sort of problems do you run into if you hook up 10 
>more 12V
>batteries in parallel, so the Voltage is the same but the number of 
>Amp-hours goes way
>up?  I have thought of only 1 - the charge time goes way up.  Afraid 
>I'm just a bit new
>at this - I have some schooling in EE, and I'm capable of operating a 
>soldering iron
>and a DMM, but in some things I'm just a bit green.
>
>    Also, I think I will have to use a bus bar for this setup, but I
>don't know why -
>I've just seen it mentioned.
John, I have tried 3/16"x 3/4" x 8" pure Cu buss bars.  Bill from
Hartford, CT
drove my truck and whoever was behind use got out of their ICE vehicle to
tell us
out truck was on fire and shooting sparks.  So much for the safety image
of EVs
The little bit of road vibration loosens the lead and even the terminals
if very rigid.
Now I use ultra flexible instrument wire and low volt drop "Quick Cable'
Brand terminals.  Efficiency goes up with increas of pack voltage.  So
much voltage drop
at 12, 24, 48 volts.
You finally see a dramatic difference in the 100 volt area.


>    And finally, I'm planning on taking this production-built circuit
>board to an>engineer friend to find a place in the circuit where I can
attach DC 
>leads to enable me>to charge the batteries with a random DC power
source. (Voltage and >Amperage will be>controlled) - anyone ever do
anything like this?
>Any help is really really appreciated.

I did some thing like a random voltage source charger thru a spare 1221B
PWM
and it worked.  But expensive!  A low cost one step method or voltage
regulation
is an SCR voltage controlled charger but the ferroresonnant Lester will
work on 208 or 240 volt with a wider swing of input voltages.
E-meter is very good for getting energy back in to pack.  

>
>Thanks,
>John
>

hope that helps somewatt.
http://www.concentric.net/~russ239
D. Russell Graves
P.O. Box 261, Maynard, Massachusetts,01754-0261

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