short lived UPS system [RE-wrenches]

[EH Roy]

Todd,

I'm sure Richard Perez can explain the physics behind this but lack of
cycling and equalizing of batteries kept in a continuous float condition
causes something called "mossing". Essentially fine pieces of lead flake off
and collect at the bottom of the cell. When they collect to the point where
they reach the bottom of the plates it shorts the plates and charging takes
more and more energy because of the short. The short results in increased
battery temp during charging - you'll notice it. Increased water usage is
another symptom. If you try to do a vigorous charge of batteries that have
undergone mossing you will notice that the electrolyte is cloudy because of
the fine particles of lead in suspension.

As usual, don't try to replace only the shorted battery with a new one. The
others in the bank have almost assuredly undergone mossing as well and it
will only be a matter of a short time before more plate shorting occurs.
Replace the whole bank.

I learned this from Trojan when one of our Y2K customers ended up with a
failed battery bank due to mossing because all he had done for maintenance
was check electrolyte levels.

Richard, I encourage you to add, clarify, and correct as appropriate.

Thanks,
E. H. Roy
Solar Works Inc.
64 Main Street
Montpelier, VT 05602
802 223-7804 x306
ehroy at solar-works.com



-----Original Message-----
From: Todd Cory, Mt. Shasta Energy Services
[mailto:toddcory at finestplanet.com]
Sent: Thursday, September 25, 2003 11:45 AM
To: RE-wrenches at topica.com
Subject: Re: short lived UPS system [RE-wrenches]


I still don't understand the need for cycling flooded LA batteries. I can
see
the need for equalization charges here and there, but cycling? Why? These
are
not ni-cads so IMO should only suffer from needless cycles not benefit from
that.

Todd




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