However, I would use a APC battery backup, they range from $60-$150 and would power the pumps much longer than the Vortech one (depending on APC model)
Costco usually has the 1000VA models for about $130 and 1200VA for $150ish. I bought many of these for my servers.
In that example 2, there is a lead acid battery. In your experience, how long do those last before replacement. I assume that it is a sealed, deep cycle, maybe it even has gel cells
Thanks