Would depend greatly on how big a UPS you get and how much you are running on it, but if you don't mind a power disruption until a generator starts up, it's probably most cost effective way to go. Just be careful on rated/surge watt ratings. They are usually inflated from reality. I have a 3250w that has a hard time even running my septic pump, and usually isn't able to start my table saw, and thats even after running it through a 5kva transformer to take advantage of the full phase of the genny.
Cripes, last job I was at, we had three big UPS units lying around unused. (I disposed of 11,000 pounds of batteries from two of them) I think two were 80kva and one a 160kva. Probably could find one for free somewhere, and install fresh batteries.
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