|
[DPRG] Charging many sealed lead acid batteries at once
Subject: [DPRG] Charging many sealed lead acid batteries at once
From: Randy M. Dumse
rmd at newmicros.com
Date: Fri Jun 13 09:30:11 CDT 2008
Ed Paradis said: Friday, June 13, 2008 9:09 AM
> My question is this: Is it wise to parallel all of them to
> charge them? Perhaps with blocking diodes? Or would I be
> better putting them all in series and charging them that way.
Don't know too much on the subject, but I've always heard it is
not wise to parallel lead acid cells, particularly of different
type or age. If one cell fails, the battery will drop to 11.xV
and then the batteries paralleled with it will loose all their
charge trying to bring the low one up to their level. So instead
of loosing on battery with a partial failure, you loose them all
at once, and they're all damaged in the process.
Charging through a blocking diode, with out a "sense" input is a
bad deal. Instead of being topped off, each battery will be .7 V
below full charge. (Actually they'll probably still get full
charge, but at a many X charging time.)
Randy
More information about the DPRG mailing list
|
