You could look online for a refurb at a lot lower price.
I've setup such systems and generators for a number of
people. Years ago I found a junk dealer who had a perfectly
good 10 kw ups that came out of a hotel, his crew got hold
of it and ruined the darn thing. It used a dozen or so lead
acid batteries about the size of a standard car battery.
There are companies all over that sell refurbished and good
used equipment. I have several used APC rack mount units in
the shop that were picked up at auction. I haven't messed
with the things yet because the price of batteries went out
of sight a while back. Here's a link to one company:
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