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That will depend on the UPS specifications (e.g. output VA rating, efficiency) as well as the load's reactance.

There are UPSs with output VA ratings from as low as 100 VA to several hundreds of thousands of VA (this is more than 3 orders of magnitude in equivalent wattage). The higher VA rated UPSs must by the electrical code be wired directly (they cannot be plugged in and they weigh several tons so they can't be moved either) by a licenced electrician.

The more efficient a UPS is, the closer the input watts needed will be to the output VA rating, a less efficient UPS will need more watts.

The only way you can get a reasonable estimate of the answer to this question is to read the specifications in the manual for the specific UPS you are interested in or are already using.

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7y ago

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