"Sandbag" wrote in message ps.com...
A UPS is not always a good idea since the draw of pumps and various
equipment can change and trip the UPS on power surge. The APC 1500 VA
would be the only one I recommend since it can be eaxpanded to 3000VA
with the extra battery pack.

Could you explain above? I would have to disagree...

Adding an extra battery pack DOES NOT increase maximum current
the inverter or UPS can deliver. This current limit is based on the inverter
internal design and electronic parts (transistors, fuses) used to build it...
Adding extra battery pack will increase TIME the inverter will work from
the battery with the same load, but will not increase the maximum load.