my pump has a pressure tank but I also have a 100 gallon tank that is not being used at the moment. My plan was to draw enough water, store it and enough time would pass so the batteries would be recharged before i needed to run the pump again
How long of an outage, and how much water use do you want for that time?
I would think bladder tanks and check valves would be cheaper than the amount of batteries you need.
Just my 2¢