Grundfos SQFlex Submersible Pump

The Grundfos SQFlex is the ultimate submersible pump for water lifts of up to 525 feet. They can be directly powered by solar modules or wind turbines. They can also 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. 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 gpm at 525 feet to 50 gpm at 20 feet of head with a 1 kilowatt solar array or less. 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. The SQFlex has built-in protection from dry-running, overload and overheating.

The SQFlex pump can run on a 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 module.

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.

SQFlex pumps have a 1 year warranty from the date of purchase. A 5 year extended warranty is available separately.

Optional Controls

CU200 interface box: it 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 to turn off the pump when a tank is full.

IO100 control box: simple control unit with cable terminations and a manual on/off switch.

IO101 AC interface: ideal for using AC backup on a solar SQFlex pumps. 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.

IO102 wind interface: this 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.

The SQFlex pumps will not function with a GFCI in the supply circuit, and should not be used where a GFCI is required.