• Livestock watering
• Livestock watering with solar solutions
• Irrigation groundwater lowering
• Agriculture Solar solutions
• Solar boosting & reliable water supply
• Municipal solar solutions
• Community water supply
• Off-grid home water systems
• Municipal solar solutions

Additional Grundfos Pump Resources

Grundfos Pre-Designed Solar Water Pumping System Packages (Solar and Pump Kits)

Grundfos Solar Water Pump Components and Parts

Grundfos SQFlex Solar Submersible Pumps

This Grundfos submersible pump is designed for deep wells and can lift water up to 820'. The 11 different pump models can deliver from 82 GPM at 6' of head to 4.5 GPM at 820' with most models needing no more than a 1.6 kW solar array.

There are two different pump technologies: Helical Rotor Pumps and Centrifugal Water Pumps. For high efficiency, use helical rotor pumps (models 3 SQF-2, 3 SQF-3, 6 SQF-2, 6 SQF-3, and 11 SQF-2) for high-head applications and centrifugal pumps (models 16, 25, 40, and 60) for low-head applications. The SQFlex submersible pump has built-in dry run protection and safeguards against overloading and overheating.

Power SQFlex Submersible Pumps with Solar, Wind, or Grid Power 

SQFlex submersible pumps can be directly powered by solar, wind, or household grid power. They can also be remotely operated with a generator, battery bank, inverter, or any combination of these sources.

Virtually any source of power, 30 to 300 VDC and 90 to 240 VAC, can be used to run these submersible pumps. They can operate on solar panels in a series configuration with a total peak power voltage of at least 30 VDC, but their efficiency will be highest at voltages over 100 VDC (10% less efficient at 60 VDC and 20% less efficient at 35 VDC).

Its motor is engineered to draw a maximum of 8.4 A, which means that this pump can be used with many types of PV modules, including the common 60-cell modules.

SQFlex models 3-SQF through 11-SQF will fit into a 3" well, and models 16-SQF-10 through 60-SQF-3 will fit into a 4" well - check the chart below.

Grundfos SQFlex Models:

Power the Grundfos SQFlex on Renewable Wind Power

The Whisper 200-120-volt wind generator can be connected directly to a SQFlex pump. Use the Grundfos IO-102 Wind interface in place of the Whisper 200 Controller.

SQFlex Warranty and Extended 5-Year Warranty

SQFlex pumps have a 2-year manufacturer warranty from the date of purchase. You can also purchase a Grundfos SQFlex 5-year extended warranty when you purchase your pump or kit, and it’s verified and documented by a dealer.

Grundfos SQFlex Optional System Monitoring Interface

CU202 Interface Box

If you require a little more control and information regarding your Grundfos SQFlex pumping system, you can use the CU200 Interface Box. It has built-in diagnostics that indicate faults, display operating status and power consumption, and prevent dry running. The CU202 can also connect to the Grundfos Go app and has the ability to adjust the max pump running speed. The CU202 is covered by a standard 2-year warranty.

Water Level Switch Input - The CU202 also has an input for a water level switch to automatically turn off the pump when your take is full. Since the CU202 control circuit uses only 15 mA, the water level switch can be located in a tank as far away as 1,640' from the pump, using a minimum #18 AWG 2-conductor wire. The water level switch input can also be used to connect a reverse action pressure switch.

IO-50 Control Box (Solar Disconnect)

The IO-50 control box includes cable terminations and a manual on/off switch that interfaces between a solar array and the pump to allow you to turn off the high-voltage array when servicing the pump or plumbing.

IO-101 AC Interface Box (Auto Power Switching DC & AC)

The IO-101 AC interface box uses AC backup on a solar pump. A transfer switch can disconnect the solar array when AC power from a generator (115 VAC is the standard model but a 230V model is also available), utility connection, or inverter is present. When AC power stops, it automatically reconnects the array to let the sun continue pumping. The SQFlex submersible pumps will not function with a GFCI in the supply circuit and should not be used where a GFCI is required.

IO-102 Interface (Wind or Wind & PV)

The IO-102 interface unit is used for systems powered exclusively by a wind turbine or by a combination of wind and PV.

Explore Our Range of Grundfos Pumps Today

At The Solar Store, we bring over two decades of expertise in off-grid living and renewable energy solutions. Browse our selection of Grundfos submersible pumps and discover the perfect solution for your water pumping needs.

Contact us today to find the ideal Grundfos pump for your project and experience the difference that quality and expertise can make in your water management system.

Frequently Asked Questions

What’s the difference between helical rotor and centrifugal pump models?

Helical rotor pumps are ideal for high-head applications, while centrifugal pumps are more efficient for low-head applications. The choice depends on your specific water depth and flow rate requirements.

How do Grundfos submersible pumps handle low sun or wind conditions?

SQFlex pumps can switch between different power sources (solar, wind, grid, or generator) to maintain a continuous water supply, even if one power source is inconsistent or unavailable. Depending on your total dynamic head, the helical pumps can start producing at as low as 100W,

Do I need to worry about dry-running my Grundfos SQFlex pump?

No, SQFlex models come with built-in dry run protection, along with safeguards against overloading and overheating, extending the pump’s durability and operational life.

Additional Articles:
Learn how a Californian Grape Farmer uses Grundfos Pumps for their farm.
Solar Water Pumping Kits and Systems for Farm, Ranch, and Livestock
Solar Water Pumps and Systems | Efficient, Simple & Reliable
How to Install Grundfos SQFlex (YouTube)