battery stuff [RE-wrenches]

[Darryl Thayer]

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Hi Todd
I have seen lead Calcium last 40 years, When they do
not get cycled very often.  I have seen Lead Antimony
batteries fail in 2 to 3 years if they are not cycled.
 Go figure.  Why do we solar people always flock to
lead antinomy?  I would say stick with the flooded
lead calcium cells.  You can watch and maintain them,
you can test the state of charge with a hydrometer, if
you over charge you just loose water, which you can
add again.  The sealed cells you do not know what is
going on.  
Daryl
--- "Todd Cory, Mt. Shasta Energy Services"
<toddcory at finestplanet.com> wrote:
> Battery experts,
> 
> One of the things I do when not putting in RE
> systems, is to work at our
> local 6.5 mW hydro plant. It has been in service for
> 20 years now, and
> time to replace the 120 volt DC, back up battery
> bank. To date we have
> had a set of 20, six volt @100 ah lead calcium
> flooded cells. The cells
> are rarely cycled and these have proved to be a
> good, low maintenance,
> reliable back up supply. The plant owners are
> wanting to switch to gel
> or AGM cells. I think replacing what we have now
> would be best.
> 
> Questions... what do other list folks think? Would
> AGM batteries last 20
> years? Would they perform as well as the lead
> calcium cells we have been
> using?
> 
> Todd


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