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At the end of the day the power rating is irrelevant, what matters is the (usually) miniscule battery capacity in the UPS.
As an example, an average small 600VA UPS has about 7 amp hours capacity at 12 volts, in other words at best around 80 watt hours, at full load you could expect 5 minutes before the UPS died.
If you want longer run times pick a UPS that can have an add on battery pack or better still one that you can fit your own batteries.
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