The SQFlex family is an environmentally-friendly water supply system. SQFlex pumps are fitted with a permanent magnet motor which enables the efficient use of energy from a wide range of supply options. The pump system offers the perfect water supply solution in remote areas where water is scarce and the power supply is non-existent or unreliable.
Very flexible as to its energy supply and performance, the SQFlex system can be combined and adapted to any need according to the conditions on the installation site. A battery backup system can store the extra energy generated and take over when the primary energy source is not available.
SQFlex is more than just a pump – it’s a complete system. Thanks to its built-in electronics, the pump is compatible with both DC and AC power supply without requiring an external inverter.
The complete range consists of eleven different pump sizes: Five helical rotor pumps for applications where a high head (820’) is required, and six centrifugal pumps for applications where a greater flow (80 gpm) rate is necessary.
Being designed for continuous, as well as intermittent operation, the SQFlex system is especially suitable for water supply applications in remote locations, such as:
- Villages, schools, hospitals, single-family houses, etc.
- Watering cattle
- Irrigation of fields and greenhouses
- Game parks and game farms
- Watering applications
- Conservation areas
- Surface water pumping
- Floating pump installations for pumping water from ponds and lakes
Features and Benefits
- Renewable energy supply: solar panels or wind turbines
- Built-in electronics, easy installation
- Reliable water supply
- Low operating costs
- Dry-running protection
- Built-in motor protection
- High Efficiency
- Maximum Power Point Tracking (MPPT)
- Wide voltage range: 30-300 VDC, 90-240 VAC (+6/-10%)
- Helical rotor pump
- Centrifugal pump
- Built-in sand shield
Grundfos solar surface pumps provide the perfect sustainable, reliable and cost efficient alternative to irregular water supply solutions in remote locations, or for highly specific applications anywhere.
Theses pumps provide individual solutions to water problems where conventional water supply systems fail or simply cannot reach. Although the initial investment including solar panel is higher, the operating cost is minimal.
Grundfos has developed the MGFlex motor for optimal performance using solar power, for surface pump applications. In addition to solar panels, Grundfos solar surface pumps can be run from the grid or a generator.
With variable speed operation and motor protection built in as standard, Grundfos solar surface pumps offer
- Easy installation
- Virtually no maintenance
- Low cost and highly-efficient pumping
The Grundfos solar surface pump system is designed for renewable energy supply. Powered by a solar panel, the system is especially suitable for supplying water in applications such as these:
- pressure boosting
- Water supply for cabins or off-grid homes
The MGFlex motor can be mounted on select Grundfos CR pump models.
Features and benefits
Maximum Power Point Tracking (MPPT)
The motor continuously optimizes the speed according to the input power available when connected to DC supply.
Wide voltage range
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 operate from 100 VAC with a derated power (at maximum input current 3 Arms).
Overvoltage and undervoltage protection
Overvoltage and undervoltage may occur in case of unstable power supply or a faulty installation.
The motor will be cut out if the voltage falls outside the permissible voltage range, and it will be cut in when the voltage is again within the permissible voltage range. No extra protection relay is required.
The motor is supplied with built-in thermal protection according to IEC60034-11, both steady overload and stalled condition. It will be stopped and restarted automatically.
SQFLex and CRFlex Solar Combination
In addition to enabling customers to store solar energy as water in a reservoir, it offers pressure boosting. Benefits The SQFlex pumps water from wells as small as 3″ [76 mm] and stores it in a reservoir. The CRFlex pump transfers water over a long distance or increases the water pressure.
Combined with a CU 200, the level switch will stop the SQFlex when the reservoir is full. The CU 200 offers the following indications:
- full water reservoir (level switch activated)
- pump operation
- input power.
The CU 200 indicates operational stoppage in these cases:
- dry running
- insufficient energy supply
The system also offers these benefits:
- easy installation
- maintenance confined to periodic cleaning of the solar panels
- few and simple components
CU 200 Accessory
Battery backup systems can be used with an SQFlex pumping system. These systems are typically used in applications where the pump will not be running during most of the peak sun hours of the day, or where it is impossible or impractical to store large volumes of water. Examples include remote homes or cabins, automatic livestock waterers, and very low-yielding wells.
The system will be wired as shown attached pdf document:
- Power will be provided by the calculated number of solar panels wired to produce 48 VDC (nominal)
- Power from the solar panels will feed into a 48 VDC charge controller, which will regulate the current fed to the batteries
- From the charge controller, power passes into the battery bank, which consists of the number of appropriately sized batteries, wired in series to achieve 48 VDC (nominal) output • Power is drawn from the battery bank and routed through an SQFlex control box (CU 200)
- Power is run from the control box to the SQFlex pump
For domestic water supply applications, the CU200 pump control box should be selected, since it includes terminals for a pressure switch, which will control the pump’s on/off operation via the pressure in the storage tank. The pressure switch should be of a normally-open configuration, where the contacts within the switch are in the open position when the pressure is below the maximum set-point. When the pressure in the system rises to the maximum desired pressure, the contacts will close, signaling the pump to shut off.