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this post was submitted on 11 Sep 2023
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I'd multiply by 10-12 hours to account for losses in the DC-AC conversion.
are there no dc-dc PSUs (or technically just voltage regulators I guess) to relace a PSU with available? That way OP could avoid part of the Ac->Dc->Ac->Dc-conversion related losses he would have with a battery-backup.
The cost of this would be much higher than just buying a bigger UPS I imagine, but it's definitely doable from the technical standpoint