Data center draws a lot of power. One should consider whether there are Green technology implemented to reduce operating expense. Also spelling out stringent resiliency requirement is good, but one must be pragmatic when doing the specification. What are we trying to protect, what is the business impact, how much downtime can the business tolerate, and what level of risk can the business take. When carefully thought through, the added resiliency might not be necessary.

I'm curious about the price as well. I was told that for a 10KVA unit, the estimated price will be over US$ 150K based on 1982 pricing. It's no longer 1982 anymore, but I guess it will be still quite high since the technology has been known for over a hundered years and yet there has not been a practicle unit that has been produced for home use.