Re: Proper Buddy Pairing ?? and Burning on New Posts?

[Ron Schroeder <rjs@bnl.gov>]

At 04:25 PM 6/29/00 -0400, you wrote:
<snip>
>     I am stuck on the fact that if I'm pulling 500 amps each battery in the
>pair sees ~250. But 10 gauge can't carry 250 amps? Maybe I got the wiring
>wrong when I looked at the picture in the archive, or just don't understand
>the how series parallel thing works. Could someone please set me straight
>:-)
>
>Thanks,
>Mark Hastings


Hi Mark,

I hope my teletype drawing is understandable.  The 10 ga. wire is only
handling the imbalance of currant which should only be a few amps.  Keep
the 2/0 cable pairs that connect one buddy pair to the next the same length
to help the ballance.  Only the top and bottom cables that connect the
strings need to be large.  They should be as short as possable, of equal
length and cables that connect to the pack should come from opposite
strings.  (see how top cable goes to the right and the bottom cable goes to
the left)  This keeps things as balanced as possable by equalizing the
cable voltage drops.



===== is 2/0

_____ is 10 ga.


  | is 2/0
  |      

             ======================== 2/0  Plus
             |        |
           -----    -----
            ---      ---
             |        |
             |________|
           -----    -----
            ---      ---
             |        |
             |________|
           -----    -----
            ---      ---
             |        |
             |________|
           -----    -----
            ---      ---
             |        |
             |________|
           -----    -----
            ---      ---
             |        |
2/0====================
Minus


Ron








----------------------------------------------------------------------
Ron Schroeder
WD8CDH
E. E. S.
wd8cdh@bnl.gov
rjs@bnl.gov
ron@112motors.com
631 344-4561 Day
631 286-5677 Nite
*note change of area code to 631 from 516