We run a configuration similar to this, except we do failure per-row
with one APC Symmetra supporting between 3 and 6 cabinets, depending on
the projected load. In the past 2.5(?) years, we've had one controller
failure that did not cause an outage. All the batteries are fine,
though we have not run them to zero. It turned out to be a very clean
install as far as conduit and cabling goes, we're very happy with it.
We do the same for one of our data centers, except we borrow one of the
telco generator trucks due to lack of facility for an onsite generator.
We have it setup to power both our Symmetra's as well as the telco's
battery array one floor up. We've replaced two batteries and one
powersupply in about 4 years (all recent) and had the Symmetra panic and
warm reboot when electricity was being rerouted once.
