I have a small 60 Hz, 240 volt power supply (250 watts, sine wave) that is run off of a car battery. Would only need the PV system to run water well (for livestock) during the day, but it takes FAR more peak kW to start the pump.
Completely agree that running a generator is a complete waste.
Battery back-up is expensive and the 1.5 kW Sunny Boy back up power is not large enough to kick on the 2HP deep well water pump. Have already considered that.
It is actually quite easy to wire in a dump load!
Only really need power during the day to run water pumps on farm and it seems a waste to have ~ 10 kW of PV power just sitting there . . . . We lose power frequently in spring storms (one today forecast in central OK where I am located), so I am thinking ahead before I do physical install.
Good thoughts!
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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