Re: (ET) Battery failure?

["Travis Creswell" <ozsolar ipa net>]

I work with deep cycle batteries for a living.  My opinion would be;

38.1 volts would be considered full charge at resting voltage (3 hrs after
no charging or discharging)

36.3 volts would be considered empty at resting voltage.

In order fully charge the pack the charger should be able to hold the
batteries 44.5-45.5 volts for 2 hrs.

47 volts is pretty high and would only be necessary if the batteries needed
equalized.  Holding them at that voltage (assuming your charger could get
them there) for a few hours would balance the cells in the individual
batteries as well as balance the batteries with each other. There would
definitely be some pretty aggressive bubbling of the batteries.  There 
would
be electrolyte residue all over the batteries and battery box.  Plus any
overfilled batteries would leak over the caps causing quite a mess.

A hydrometer is an excellent tool to have if you don't already have one.  I
find the $5 or less ones compare nicely to the expensive ones so save you

Best,
Travis Creswell
Joplin, MO



-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Perry Cain
Sent: Monday, April 17, 2006 9:20 AM
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) Battery failure?

RE: Battery Failure?
Also, make sure that each of your batteries are level before/after the
charge.  If you have one or two batteries that don't get fully charged, 
then
you will have the problem you described...  Often the lift batteries, or 
the
headlight batteries, will get out of sync with the other batteries, in 
which
case you will have to bring them up to sync with a 6v or 12v charger.



BTW, does everyone agree that after a charge the pack should read about 
47V?
That seems high to me...  I would like to know what others think...

 
Perry Cain
perry suppleye com




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