If you've already got one - easy answer becomes you just need more battery capacity 
Split'r open, see what kind of batteries you've got from the factory and post pictures of the battery packs/cells (look for the AH or mAH ratings) - I'm sure we can come up with a way to add ridiculous capacity to that UPS 
Or just head over to costco, grab yourself a couple pairs of 6v golf cart batteries, a true sine wave inverter and one of them there newfangled 'smart' battery chargers... If they can run my RV for 10 days, should be able to handle that pump for a few weeks 
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