Pump motor is a capacitor start; full load amp draw “measured” when the tank is full and the water table is at it’s lowest point, is 9.83, Amps, start-up inrush lasts .00256 seconds and is 28.62 amps. The generator notices the start-up but no up-throttling just a minor notice of sound change, the only thing that the generator sees as a 220VAC load is the water pump. I set the system up in the beginning with a slightly up-sized pump to minimize full load amps and inrush knowing the intent of the future. At the TDH “total dynamic head” of my system, I am more then adequate in operational sizing. It cost more up-front partially because it has 8 more stages then required, but is worked far less then the 1& ¼ Hp required to meet the TDH and it fills at 10GPM with no hassle. I have over the years run air compressors 3HP, at 110 VAC, table saws, radial arm saw, jointer, planer, band saw etc while building the actual house and living in a large camper while the wife was watching TV or whatever. The SW is a fine piece of equipment as far as I have seen. The information regarding the apparent differences between SW’s & XW’s was garnered from downloading the O & M’s from Xantrex and my original manual. I can clearly see a major weight difference and many adjustments are “or at least appear to be” no longer available.