Large Battery Banks [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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>I have a client that due to downgrade of his health wants to remove
>large battery bank of 2 volt wet cells on his off grid home, and
>install a battery bank with absolutely no maintenance.  Cost not a
>primary consideration (within reason).
>
>I am considering stacked battery modules using sealed valve regulated
>2 volt Daka Unigy II cells.  This would be two (2) stacks wired in
>parallel, 2000 amp-hours @ 48 Volt total, with a stack weight of 4100
>pounds each.  Existing loads on old system indicate there would only
>be a 20% daily draw down maximum, which should give him the very long
>no maintenance life he wants.
>
>We have also considered gel cells, C & D VRLA batteries,  and GNB
>Absolyte IIP batteries.  Has anybody used any of these brands or types
>for a system this large?  Good, Bad, Other?
>
>Jeff Yago


Jeff,

I got some Absolyte IIP batteries surplus about 7 years ago, and sold 
sets to about 5 customers. They have been excellent. The normal price 
however was extremely high.

In one system, the controller was left at normal flooded voltage by 
accident. After a year or so, they showed symptoms of high 
resistance. Water was added, just enough to saturate the pads between 
the plates, and they have been working every since.

Windy

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