Surrette was HUP was IBE [RE-wrenches]

[Todd Cory, Mt. Shasta Energy Services]

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I am beta testing a set of Surrette L-16 lead calcium batteries here on 
my home grid tie/w battery back up system. Lead calcium batteries are 
designed for float service rather than lead antimony which is designed 
for cycling. They use next to no water, have low self discharge rates, 
rarely need equalizing and should easily last 20 years. I have had these 
in service for a month now and they seem to be doing fine. Once the beta 
testing is over - IMO this will be THE battery for backup grid tie systems.

We had a set of C&D lead calcium batteries at the hydro facility I work 
at. They were 20 years old when we replaced them as their "rated service 
life" was up. They are now installed in my greenhouse's small system and 
still going strong.

Todd


Drake Chamberlin wrote:

>
> Have you had experience with HUP, with on grid, backup systems?  Do 
> HUPs last well if floated?  Wasn't there a positing on this list that 
> said that the IRS is using HUPs for their massive backup system?
>
> Drake


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