When AC power stops, it automatically reconnects the array to let the sun continue pumping. An automatic transfer switch disconnects the solar array when AC power from a generator, utility connection or inverter is present. The IO101 is an interface for using AC backup on a solar pump. It is a great interface between a solar array and the pump to allow you to turn off the high voltage array when working on the pump. The IO100 is a simple control box with cable terminations and a manual on/off switch. The water level switch interfaces with the CU200 control to turn off the pump when a tank is full. Built-in diagnostics indicate faults and dry-running, display operating status, power consumption and water level switch input. The CU200 interface box communicates with the pump and monitors operating conditions. The Whisper 200-150 V wind generator can be connected directly to an SQFlex pump. A 5 year extended warranty is available separately. SQFlex submersible pumps have a 2 year warranty from the date of purchase. The SQFlex has built-in protection from dry-running, overload and overheating. Helical rotor pumps (models 3, 6 and 11) for high head applications and centrifugal pumps for low head applications assure a pump that is efficient for any use. Seven pump models can deliver from 2 gpm at 600 feet to 65 gpm at 20 feet of head with a 1 kilowatt solar array or less. SQFlex 3 and 6 pumps will fit into a 3" well.
They can operate on a series string of PV modules with a total peak power voltage over 30 volts, but the pumps efficiency will be much higher at voltages over 100 VDC.
Virtually any source of power, 30-300 VDC and 90-240 VAC, can be used to run the pump. The Grundfos SQFlex solar pumps can be directly powered by solar or wind power or can be run on an inverter, a generator, a battery or the utility grid, or any combination of these sources. Grundfos SQFlex 11 SQF-2 Solar Submersible Pump
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