Grundfos SQ Flex

Pump output curves are given at standard test conditions of 1000W/m² solar irradiance and 25°C.

The output will vary throughout the year depending upon prevailing irradiation levels. For estimated daily outputs at continuous pumping multiply by the daily irradiation given in Graph 1(see drawing). For indicative purposes, factors of 1.1 can be applied for hot arid areas and 0.9 for temperate high altitude areas in East Africa.
The output will vary throughout the day as a proportion of the estimated hourly irradiation as shown in Graph 2.

NOTE: Output estimations are strictly indicative. More accurate projections are available using the manufacturer's data when the exact site location and installation arrangement are defined. This information will be provided with all offers.

A range of four models of helical rotor pumps for high heads and low flows (suitable for 3” boreholes) and six models of centrifugal pumps for low heads and high flows (suitable for 4” boreholes) are offered with stainless steel used extensively in construction for both pump designs. Pump model selection is determined by the duty requirement.

Grundfos MSF 3 high-efficiency permanent magnet motor is specified with all pump types. The motors can be powered by either DC or AC voltage within the range of 30-300V DC and 1X90-240V, 50/60Hz AC. An integral control module uses MPPT technology that continuously optimizes output frequency to maximize system efficiency and protects against over and under voltage (except lightning), electrical overload, and over temperature. Effective dry running protection is provided by a sensor in the motor cable.

A variety of switch boxes are available for the various installation options including IO50 for a manual solar system, IO101 for solar/generator systems, and IO102 for a wind system. In addition, a CU200 (1400W) or CIU903 (2500W) control units are offered which provides for high-level switch control together with system monitoring and alarm indication.

SQ Flex systems are recommended to be powered by crystalline photovoltaic modules connected in arrays to provide the power selected. Arrays should be connected to produce at least 40V input voltage with a higher voltage of around 100V recommended for maximum efficiency operation.

A complete range of accessories including connecting cabling and fittings, drop cable, and module support structures are available to provide all necessary components for a complete site installation.



Model Motor Size(W) Voltage (V)  Current (A)  Rp(“) Dimensions (mm) Weight (kg)
SQF 0.6-2 1400 30-300     8.4     1.25 1185 74 9
SQF 1.2-2 1225 10
SQF 1.2-3 1295
SQF 2.5-2 1247
SQF 3A-10 968 101 11
SQF 3-105 2800 100-300 12 942 74 7
SQF 5A-3 1400  30-300 8.4 1.5 815 101 10
SQF 5A-7 920 101
SQF 5-70 2500 100-300   12  941 74  6
SQF 7-55 860 74  6
SQF 8A-3   1400   30-300   8.4 2 920 101 11
SQF 8A-5 1011 101 12
SQF 11A-3 982 101