Grundfos CRFlex Surface Pumps

Grundfos CRFlex Surface Pumps

Grundfos CRFlex solar surface pumps provide a reliable and cost-efficient alternative to irregular water supply issues in remote locations or for highly specific applications anywhere.

These pumps provide a solution for water systems where conventional water supply systems fail or simply cannot reach. Although the initial cost, including a PV array, may be higher than a standard AC pump, the operating cost is minimal.

Grundfos has developed the MGFlex brushless DC motor for optimal performance using solar power for surface pump applications. In addition to a PV array, Grundfos solar surface pumps can be run from the grid or a generator providing 240 VAC. They can also be run on 120VAC, but with reduced output. Designed for continuous as well as intermittent operation.

With variable speed operation and motor protection built in, Grundfos CRFlex solar surface pumps offer easy installation, virtually no maintenance, and low cost and highly-efficient pumping.

The CRFlex is designed to be powered from a PV array, and is suitable for applications such as irrigation, livestock, fish farming, water transfer, and pressure boosting. They can also be used to supply water and pressure for cabins, off-grid homes, or remote villages. They can be also used for swimming pools with a suitable leaf and debris trap installed on the input.

The MGFlex motor provides Maximum Power Point Tracking (MPPT) of the PV array, assuring maximum output and efficiency. The motor continuously optimizes the speed according to the input power available from the array. The wide voltage range enables the motor to operate at any voltage from 110 to 415 VDC or 220 to 240 VAC. The motor will also operate from 100-120 VAC (at a maximum input current of 3 A) with a de-rated output. It will run on a DC power input of 70 W to 1,250 W with a maximum current draw of 5 A. The motor speed range is 1,000 – 3,400 RPM.

If the power supply is unstable, over-voltage and under-voltage conditions may occur. The MGFlex motor will cut out if the voltage falls outside the permissible voltage range, and it will restart automatically when the voltage returns to normal. No extra protection relay is required. The motor is supplied with built-in thermal protection according to IEC60034-11, for both a steady overload and a stalled condition. These pumps are not outdoor rated, so they must be protected from direct sunlight and rain.

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