Grundfos SQFlex Submersible Pumps

The complete SQFlex pump range consists of 7 different pump sizes: 4 centrifugal and 3 helical rotor pumps. All pumps are fitted with the same size motor which, together with the new sizing tools, makes system sizing simple.

These are the ultimate submersible pumps for water lifts of up to 525 feet. They 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. Virtually any source of power, 30-300 VDC and 90-240 VAC, can be used to run the pump. And with Grundfos, you know it is built to last and is maintenance free. Some SQFlex pumps will fit into a 3" well.

Seven pump models can deliver from 4 gallons per minute at 525 feet to 50 gpm at 20 feet of head with a one kilowatt solar array or less. Helical rotor pumps are like two drill bits working together (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. The SQFlex has built-in protection from dry-running, overload and overheating.

The SQFlex pump can run on solar arrays starting at 129 watts. The array must have an operating voltage over 30 volts. The array can be made of any combination of 3 or more 12-volt nominal modules in series or 2 or more 24-volt nominal modules.

SQFlex pumps have a one year warranty from the date of purchase. A 5 year extended warranty is available separately.

Grundfos also has a specially designed Whisper 200, 1kW wind generator with 150VDC output for water pumping applications using wind power.

Poly pipe in rolls is acceptable instead of rigid pvc or galvanized because the slow-start feature of the motor reduces startup torque and twisting of the pipe.

Optional Controls

The CU200 interface box communicates with the pump and monitors operating conditions. Built-in diagnostics indicate faults and dry-running, display operating status, power consumption and water level switch input. The water level switch interfaces with the CU200 control to turn off the pump when a tank is full.

The IO100 is a simple control box with cable terminations and a manual on/off switch. 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 IO101 is an interface for using AC backup on a solar pump. An automatic transfer switch disconnects the solar array when AC power from a generator, utility connection or inverter is present. When AC power stops, it automatically reconnects the array to let the sun continue pumping.

The IO102 interface unit is used for systems powered exclusively by a wind turbine or by a combination of wind and PV.

You can use several controls if you need more features than one control can provide.

See chart to choose pump on Estimated Water Production from SQFlex Pumps

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