Depending on the rules of your jurisdiction having authority (JHA) it may not be possible for you, as a homeowner, to install such a system in a code complaint

Depending on the rules of your jurisdiction having authority (JHA) it may not be possible for you, as a homeowner, to install such a system in a code complaint way. This will definitely require a permit. Most JHAs make some allowance for homeowners to be permitted to pull permits for work on their own home, but there are usually pretty strict limits on what these permits would cover and I think most JHAs would require that permits for a central UPS be obtained by a licensed electrician. And as mentioned elsewhere, I doubt the JHA or the manufacturer of the UPS would approve of this kind of installation. There are UPS specifically manufactured for a hardwire installation and that's what ought to be used here. That said, I am sympathetic, because UPS can become very expensive very fast. I'm balking at the cost of 2U rack models from Eaton, he will have had to shell out a good chunk more based on his VA requirements but at least he avoided the significant premium for hardwired.