Sump Pump Battery backup in a storm

I already have the capability to run my stove via battery power overnight with one of my AGM 105 A/H batteries, and true sinewave inverter. I wanted to add this capability for my sump pump as well, so I can run those both overnight without using the generator for a fall storm. Although I had this idea in the back of my head, Hurricane Sandy really gave me a kick in the pants! INVERTER LINK BELOW: http://www.amazon.com/dp/B001TE0IMG/r...