How to Install the Grundfos SQFlex Submersible Pump
One of the reasons the Grundfos SQFlex solar water pump is ideal for living off the grid is because it
is simple to install if you follow some basic steps.
Items you will need in addition to the submersible pump:
● Black Poly pipe, connectors, and clamps. Use 1” for 3 SQF or 6SQF. Use 1¼ inch for 11 SQF and
25SF. Use 2” for 40SQF and 75 SQF. You don’t have to use rigid steel pipe.
● Rope, 1/2”. Poly rope works well, don’t use Manila rope, it falls apart after a while. Buy more rope
than your well depth. Use a good sturdy knot if you have to tie lengths of rope together.
● A roll of black tape.
● A sturdy eye hook on or near the well head to tie the rope to.
● Submersible Pump Cable, 10 ga, 2 conductor with ground wire.
● Underwater Cable Splices and Heat Shrink Tube to attach the pump cable to the submersible
cable. See “How to use Underwater Cable Spices”.
Procedure:
1. Lay the pump next to the well head.
2. Roll out the pipe, rope, and cable side by side, starting from the well head. Measure these to
make sure you have enough to get to your water level in the well.
3. Attach the pipe, rope, and cable to the pump. Use Underwater Cable Spices for the cable
connections.
4. Wrap the pipe, rope, and cable together with the black tape.
5. Create a place to anchor the rope near the well head. A sturdy hook on the well head or well cap
will work.
6. For shallow wells, lower the pump and rope/pipe/cable assembly into the well. This may take two
or more people, because it’s heavy. One person at the well head, and another person as a safety
at the end of the rope. Wear leather gloves so you don’t get rope burn.
7. If you have to lower the pump more than a couple hundred feet, you should use a winch or a
sturdy pulley attached to a truck to control the rope. Lay a steel barrel down sideways at the well
head and run the rope/pipe/cable assembly over it to reduce pinching and abrasion as the
rope/pipe/cable goes into the well. You will need more rope on hand with this technique.
8. When the pump is at the correct depth, tie off the rope on the hook.
Black Polyethylene Pipe. Use
the NSF grade instead of Utility
grade, because NSF is thicker
and stronger.
Join pipe pieces with four
clamps. For details on working
with poly pipe, see “Input and
Output Pipe Details” in the High
Lifter section.
Use a barrel on its side to
reduce abrasion and kinking
Page 1
How to Install the Grundfos SQFlex Submersible Pump
LA302DC
Lightning
Arrestor
CU-200
Box
250 Watt Solar
Module
Ground
Extension
Cable with
connectors
To
If the cable run to the controller
is more that 30 feet, you may
want to install a “Weatherproof
Outlet Box with Blank Cover”
where you can connect the
expensive sub pump cable to
economical outdoor Romex
cable.
Use Underwater
Cable Splices here
to join the pump
cable with the
submersible cable.
To
Ground
Romex, 10 gauge,
outdoor grade,
2 conductors
plus ground wire
18 gauge
2 conductor
cable
250 Watt Solar
Module
©2015 High Lifter Pump Service 707-923-2109 info@highlifterpumpservice.com
Make sure the dry run
switch is underwater.
It’s a little grey bulb
on the pump cable.
Float Switch
in Tank
Page 2
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