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UPS designs are for dependable power in business applications, they are not efficient both on no-load and loaded. Typically they are MSW, and most big-box retail store models run off 12V but they are commonly found up to 48VDC. If you have excess power or just want to have a hobby with renewable energy they are fun to play with, large server farm backups usually sell cheaply on eBay because shipping is extremely high from battery weight & vendors don't want to hassle with removing the likely dead batteries before boxing them up. Most standby inverters will switch fast enough that devices won't be affected, I have a $360 12 year-old Trace 2500w marine inverter that does perfect UPS duty...
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