Updated on January 31, 2024


Created on July 13, 2016

Grundfos Solar Surface Pump

Upcoming Update

The Grundfos Solar surface pump is a vertical multistage centrifugal pump that can be powered by solar, grid or generator power

Developed By
  1. Grundfos
Content Partners


Product Description

The Grundfos solar surface pump is a vertical multistage centrifugal in-line non-self-priming surface pump specifically designed for water transfer, irrigation, and pressure boosting in solar-powered applications. This solar surface pump provides a sustainable, reliable, and cost-efficient alternative to irregular water supply solutions in remote locations, or for highly specific applications anywhere.


Target SDGs

SDG 2: Zero Hunger

SDG 7: Affordable and Clean Energy

Market Suggested Retail Price


Target Users (Target Impact Group)

Household, Community

Distributors / Implementing Organizations

The product is distributed via local sales distributors in different countries.

Manufacturing/Building Method

Mass production. Interview with representative

Intellectural Property Type


User Provision Model

Users can contact their local sales company to get information on where and how to buy the CRFlex Pump. This is the List of local distributors per country

Distributions to Date Status

Several thousands. Interview with representative

Pump type

Vertical multistage pumps with Renewable MGFlex motor for solar, wind, and AC power source working on both AC and DC voltage.

Irrigation capacity (acre)

The irrigation capacity depends on the performance of the pump

Maximum flow rate (L/min)

100 L/min Interview with representative

Maximum lift/head (m)

70 m Interview with representative

Required pressure (MPa)


Maximum distance from water source (m)

The distance depends on the following parameters: tolerances to ISO 9906, temperature, kinematic viscosity, and power consumption.

Power source


Power requirement: Max power (W)


Power requirement: Max motor current (A)


Power requirement: Voltage range (V)

110-415 VDC (or 1 x 220-240 VAC)

Design Specifications

Renewable energy-based water supply system: The Grundfos solar surface pump is the simplest system utilizing solar energy for water transfer. This system offers the following benefits:

  • Easy to install and simple to use even under the most difficult conditions.
  • Maintenance confined to periodic cleaning of the solar panels
  • Materials of construction are stainless steel for the hydraulic parts and cast iron for the pump head and base.
  • The CRFlex pump must be protected against rain and direct sunlight.
  • The pump consists of a base and a pump head. The chamber stack and the outer sleeve are secured between the pump head and the base by means of stay bolts. The base has suction and discharge ports on the same level (in-line).
  • The pump is equipped with a maintenance-free mechanical shaft seal of the cartridge type.
  • The vertical distance between the inlet of the CRFlex pump and the dynamic level of the water source must be less than 20 feet.
  • 2-pole motor with an integrated variable frequency drive.
  • power input of 70 to 1250 W.
  • motor speed range of 1000 to 3400 rpm.
  • The motor has a wide voltage input range (both AC and DC) - it operates at any voltage from 110 to 415 VDC or 220 to 240 VAC (50/60Hz). It can therefore be connected to either PV solar modules, a standby AC generator, or mains power supply as required.
  • When run on DC power, it utilizes the Maximum Power Point Tracking (MPPT) function for optimal performance.
  • The CRFlex system is protected against overloading, overheating, and dry running.
  • IO - 50
  • Designed specifically for solar-powered systems.
  • The IO 50 enables manual starting and stopping of the pump in a CRFlex Solar system and functions as a connection box joining all necessary cables.

Product Schematics

Technical Support

Grundfos teams of skilled service technicians provide different services:

  • Installation
  • Optimisation & Consultancy
  • Repair and maintenance: on-site repair, pump check, and workshop repair.
Grundfos has service centers in more than 50 countries throughout the world, supplemented by more than 600 authorized Grundfos Service Partners. Read more on installation and operating instructions.

Replacement Components

Spare parts are supplied by Grundfos. Grundfos provides 24/7 worldwide delivery through the MyGrundfos platform


The lifetime is typically 10 - 25 years. End-of-life information for the MGFlex motor is online

Manufacturer Specified Performance Parameters

Specified performance targets: Temperature Range [°F]: -4 to +250 If the pump is used for liquids with a viscosity higher than that of water, this will reduce the heat and increase the power consumption. Specified chart see below, with - Typical deviation: + / - 15 %. - The measurements have been made at a water temperature of +70 °F (+20 °C).

Vetted Performance Status

The solar surface pump respects the Tolerances to  ISO 9906 test. and the motors used for the measurements are standard Grundfos MG motors.


Built-in protection for under and overvoltage and system overload. No additional protection is therefore required. Care should be taken when handling the motor due to the weight.

Complementary Technical Systems

Three models are available, all powered by the same 1250W motor providing a selection of head and flow outputs depending on the application. Grundfos has developed a PC-based sizing tool enabling the sizing of the system. The sizing tool is integrated into Grundfos WinCAPS and covers solar-powered systems. The following three parameters must be known for the sizing of the optimum system:

  • installation location
  • maximum head required
  • quantity of water required

Academic Research and References

Meah, K., Fletcher, S., Ula, 2008,  Solar photovoltaic water pumping for remote locations. Renewable and Sustainable Energy Reviews, 12, pp. 472–487.

Compliance with regulations

Grundfos has multiple certifications, including the ISO 9001 certification.

Other Information

Case studies available online, for instance Sustainable private water service delivery - TradeWater by Water Missions International. List of local distributors per country Grundfos services Grundfos Data Booklet - Renewable energy-based water supply system Installation and operating instructions. MyGrundfos platform - Instant access to spare parts Grundfos End-of-life information Grundfos Product Guide ISO 9906 Grundfos models Solar pumps are typically tested by approval organisations (i.e. government tenders) against certain requirements in solar radiation for a particular location. Interview with representative

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