Large Battery Banks [RE-wrenches]

[Jeff Yago]

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

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