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That's a good question. So I did some quick research.
First I looked up UPS capacities, and the ones they sell at Best Buy and similar were only showing their maximum output, but not their energy capacity.
What you have described is a very common issue. As storms that knock out power often bring huge amounts of rain.

As Turkey said it is the transforming power from the dc in the UPS to AC that uses quite a bit of energy.

A DC pump motor is specifically designed to mount above the AC pump in the sump pump pit. A battery will mount outside with an automatic charger.
This system will serve two purposes. As it has it's own float to turn it on or off. If the AC motor ever quits the DC one will kick in.
Their are a bunch of different brands. I am not sure which one is best.

You always want to keep the battery terminals covered. If metal falls down on the two it will create sparking and will cause a fire.
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