Very good to know as I also have a sump pump and while I didn't think the inverter could handle it, it's good to confirm.
There are also 12volt backup sump pump systems where you use a marine battery and the system has a maintainer and will come on when the ac power goes out.
I have two ac pumps and a 12 volt backup on my sump pit.
My sump pump runs every minute or two, 24/7 and I worry that the 12 volt system won't last long enough in case of an extended power outage.
Your fears about the battery not lasting long during a power outage are valid. We had a few different battery backup sump pumps over the years and the one thing I can assure you is that they are all unreliable. The batteries don't hold a charge very well and if you have a long power outage the battery back ups die fast. You can find endless reviews of bad experiences with the battery back up pumps.I am thinking a battery generator to power the equipment and the bed outlet to charge up the battery generator....
Then about 7 or 8 years ago a plumber friend of mine strongly suggested we install a back up pump that runs on water pressure. They are far superior, it's not even close. And they last a lot longer. Ours is a Liberty brand and it's been a life saver more than once. It's easily one of the best home improvement purchases we've ever made.
https://www.homedepot.com/p/Liberty...Water-Powered-Backup-Sump-Pump-SJ10/317442611
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