The Grundfos SQFlex pumps are a range of submersible pumps that are compatible with energy from renewable and traditional sources, which make them suitable for off-grid water pumping systems. The pumps are submersible helical rotor and centrifugal pumps that can receive almost any AC or DC power supply, and are commonly used as a solar pump. The SQFlex pumps operate in a wide range of conditions, up to over 200 m of head and over 80 m3/hr. with 100 watts to 1700 watts.
SDG 6: Clean Water and Sanitation
Market Suggested Retail Price
Target Users (Target Impact Group)
Distributors / Implementing Organizations
The product is available through local distributors worldwide.
Intellectural Property Type
User Provision Model
Pumps are available through a worldwide network of distributors.
Distributions to Date Status
Solar/wind submersible pump
Power requirement (W)
Average flow rate (L/min at specific head)
Up to 55 L/min at 3 m
Maximum head (m)
7.4 cm and 10.1 cm
The SQFlex pump series is a range of submersible pumps that are designed to receive a wide range of energy sources including solar, wind, generator, and grid electricity. This is made possible because the pumps can accept AC (90 V-240 V) and DC (30 V-300 V) power. The product includes built-in voltage protection, overheating protection, and dry run protection. A non-return valve is located at the top of the pump to prevent backflow into the well. There are eleven different pump models to select from, depending on the water table depths and required flow rate for users.
Technical support may be provided by local distributors or directly by Grundfos.
Manufacturer Specified Performance Parameters
The SQFlex pumps are designed to utilize a wide range of energy sources, especially renewable energy sources, while maintaining strong performance and durability.
Vetted Performance Status
No known safety hazards are related to this product.
Complementary Technical Systems
Each SQFlex pumping system consists of a combination of some of the following components: SQFlex pump, solar panels, wind turbine, generator, batteries, charge controller, switch box, control unit, pressure tank, pressure switch, and float switch. Connections between these components will be made using appropriate piping and/or electrical wiring.
Academic Research and References
Tiwari, Arunendra K., Kalamkar, Vilas R., 2016, “Performance investigations of solar water pumping system using helical pump under the outdoor condition of Nagpur, India,” Renewable Energy, 97, pp. 737-745.
Salilih, Elias M., Birhane, Yilma T., Arshi, Sofiya H., 2020, “Performance analysis of DC type variable speed solar pumping system under various pumping heads,” Solar Energy, 208, pp. 1039-1047.
Granich, William Anthony, 2009, A renewable energy feasibility study to power a water supply pump in Sacala las Lomas, Guatemala, Masters Theses, Missouri University of Science and Technology, Rolla, MO.
Compliance with regulations
Grundfos holds three ISO certifications.Grundfos also meets the Minimum Energy Performance Standards (MEPS) in Australia and the National Electrical Manufacturers Association (NEMA) standards in the USA.
Many organizations and distributors share case studies of how well SQFlex pumps have performed. One example is “A Pump That Works” by African Energy. Danish Design Award 2003