life expectancy of sealed batteries [RE-wrenches]

[William Miller]

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Davis:

My information is anecdotal:  In 1998/1999 we installed about a dozen 
grid-tie backup systems.  About half were AGM or Gel and half were 
vented.  All of the vetted systems experienced battery failure in 4 to 5 
years.  All of the sealed systems are using the original batteries.

William Miller


At 04:09 PM 1/6/2008, you wrote:

>Wrenches,
>
>Does anyone have some general ideas of the life expectancy of sealed 
>batteries in backup applications.  I have seen charts showing so many 
>cycles at such and such depth of discharge, but I am wondering how time 
>enters the equation.  If the manu says 600 cycles at 80% DOD and there are 
>10 cycles per year, does this mean the battery bank will last 60 years or 
>even close to that?  Thanks.
>
>--
>Davis Terrell
>Bright Earth Solar
>(802) 492-2273 / brightearthsolar.com


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