life expectancy of sealed batteries [RE-wrenches]

[Todd Cory, Mt. Shasta Energy Services]

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What we really need for grid tie with battery backup is an affordable 
(like the price of a traditional lead antimony L-16) made with lead 
calcium technology. These batteries are made for floating, but are also 
shallow cycle.

I am using a 22 year old set I got from the hydro plant I work at when 
their rated life was up a couple of years ago. Still going strong.

Todd


Travis Creswell wrote:

>We did about the same number of systems about the same time, many with
>Concorde AGMS and only one set still remains.  The others all died at or
>before 5 years.  Oddly, pretty much, the opposite of William's experience.
>We learned that even using the manufacturer's specifications for charging
>that grid tied systems (Trace SW's) are particularly hard on sealed
>batteries.  Our assumption was that since they constantly are charging the
>battery it dries the battery out.  One manufacturer essentially confirmed
>this but would not admit that maybe they needed to publish different specs
>for grid tied system.  It makes sense when you think about it...charging a
>battery for years on end can't be good for it even if it's just a tiny
>charge.  The one set of Concords that remains is probably still alive
>because we turned down the float setting to just above 12.7v (per 12v) after
>we started seeing all the other sets go.
>


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