Grundfos has an exciting new line of submersible pumps called SQFlex that
can deliver more water each day per watt of input power than any other pump
on the market. The "flex" in SQFlex is for flexibility since these pumps can
be powered by solar modules, a wind turbine, an AC generator or a
combination of these power sources.
You can use any brand of solar module to power a SQFlex pump, but you
must use a specially designed high voltage Whisper 200 wind turbine if you
want to power them from the wind.
There are 10 pumps in the SQFlex line, 4 feature a 3" diameter positive
displacement helical rotor pump head which is best suited for deep well low
volume requirements and 6 feature a 4" centrifugal pump head which is best
suited for low head high volume requirements. The maximum lift with the
helical rotor pumps is 600’ while the maximum flow rate with the centrifugal
pumps is 85 gpm.
All 10 pumps use the same super efficient 3" diameter MFS 3 motor/power
converter assembly that will accept a wide range of input voltages
(30-300VDC or 90-240VAC). This motor provides high torque yet a "soft-start"
non-surging capability. The power converter protects the motor from
over/under voltage, overload, over temperature, blocked outlet conditions
and from running dry by a water level electrode that is attached to the 6'
These pumps are so durable and reliable that they don't need to be pulled
for servicing every 2-3 years like some diaphragm pumps, just set it and
forget it. This can save you a lot of time, money and hassle over the life
of the system and might keep your livestock from going thirsty while your
pump is being pulled and repaired.
Grundfos offers 3 separate pump controllers to be used with the
SQFlex pumps based on your power source and whether or not you plan to
use a float switch.
The simplest controller is the IO-100 which is basically a wiring
connection box with an ON/OFF switch and it is designed for solar direct
The IO-101 controller is also designed for solar direct systems, but it
allows you to connect a 120VAC generator as an auxiliary power source. For
example; if your solar powered SQFlex pumping system is not producing enough
water due to extended heavy overcast conditions, you can manually start your
generator and it will power the pump. When the generator stops running
(manually shut off or if it runs out of gas), the IO-101 controller
automatically switches back to the solar array and the pump will run if
there is sufficient sunlight.
The most sophisticated controller is the CU-200 which can be used for
solar or wind powered systems. The CU-200 is a combined status, control and
communication unit which allows the connection of a float switch in your
tank that will allow the controller to automatically turn the pump on/off
based on water level. It communicates with the pump via the power supply
wires and is able to provide alarm indications for dry running, lost
connection to pump, over voltage, over temperature and overload.
To make sizing a SQFlex pumping system easy, Grundfos created a
simple Windows based sizing program called WinCAPS which takes the
guesswork out of sizing a pumping system. WinCAPS takes into account
your location (city/state or lat/long), daily volume requirement, month
of peak demand, total dynamic head, power source (solar module and/or
Whisper 200 wind turbine), type of solar module mount structure (fixed
or tracking) and prints out which SQFlex pump and power source will best
meet your needs along with a daily system performance chart for each
month of the year. Sizing, purchasing, installing and operating a solar
or wind powered water pumping system couldn't be any easier than with
the Grundfos SQFlex pumps and controllers.
You can see the prices of the Grundfos SQFlex pumps and controllers
below, but give us a call or send us an e-mail with the particulars of your
pumping application (fill out our Water Pumping Questionnaire by
clicking here) and we can quickly prepare an accurate system design and
quote for you.
3 SQF-2 (helical rotor)
3 SQF-3 (helical rotor)
6 SQF-2 (helical rotor)
11 SQF-2 (helical rotor)
16 SQF-10 (centrifugal)
25 SQF-3 (centrifugal)
25 SQF-6 (centrifugal)
40 SQF-3 (centrifugal)
40 SQF-5 (centrifugal)
60 SQF-3 (centrifugal)
IO-100 solar control box with on/off
IO-101 solar/generator control box
IO-102 wind turbine controller
CU-200 solar controller & status
indicator (for use with float switch)