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Grundfos SQFlex Submersible Solar Pump

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Grundfos SQFlex Submersible Solar Pump

Grundfos SQFlex Solar Submersible Pumps

This Grundfos SQFLex is an industry-leading submersible pump for water lifts of up to 800'. With the proper controller, SQFlex pumps can be directly powered by solar or wind or can be run on an inverter, a generator, a battery, the utility grid, or any combination of these sources. Virtually any source of power, 30 to 300 VDC and 90 to 240 VAC, can be used to run this pump. It can operate on a series string of PV modules with a total peak power voltage of at least 30 VDC, but its efficiency will be highest at voltages over 100 VDC (10% less efficient at 60 VDC, and 20% less efficient at 35 VDC). Its motor is designed to draw a maximum of 8.4 A, which means that many types of PV modules can be used with this pump efficiently, including common 60 cell modules. SQFlex models 3SQF through 11SQF will fit into a 3" well and models 16SQF-10 through 60SQF3 will fit into a 4" well.

The 11 different pump models available can deliver from 82 gpm at 6' of head to 4 gpm at 800' with a 1.6 kW or smaller solar array. Use the helical rotor pumps (models 3, 6 and 11) for high head applications and centrifugal pumps (models 16, 25, 40, and 60) for low head applications for best efficiency. The SQFlex has built-in protection from dry-running, overloading, and overheating.

The Whisper 200-120 V wind generator can be connected directly to a SQFlex pump. Use the Grundfos IO-102 Wind interface in place of the Whisper 200 Controller.

SQFlex pumps have a 2-year warranty from the date of purchase. A 5-year extended warranty is available.

Grundfos SQFlex Optional Controls


SQFlex controls can be combined if you need more features than one control can provide. The CU200 interface box communicates with the pump and monitors operating conditions. Built-in diagnostics indicate faults and dry-running, as well as display operating status, power consumption and water level switch input. The Water Level Switch interfaces with the CU200 control to turn off the pump when the tank is full. Since the CU200 control circuit uses only 15 mA, the water level switch can be located in a tank as far away as 1,640' from the pump, using a minimum #18 AWG 2-conductor wire. (see Wire and Cable.) The CU200 is covered by a standard 2-year warranty.

The IO50 control box includes cable terminations and a manual on/off switch that interfaces between a solar array and the pump to allow you to turn off the high voltage array when servicing the pump or plumbing.

The IO101 AC interface box is for using AC backup on a solar pump. An automatic transfer switch disconnects the solar array when AC power from a generator (120 VAC only), utility connection, or inverter is present. When AC power stops, it automatically reconnects the array to let the sun continue pumping. The SQFlex pumps will not function with a GFCI in the supply circuit, and should not be used where a GFCI is required.

The IO102 interface unit is used for systems powered exclusively by a wind turbine or by a combination of wind and PV.

Use the table below to choose a pump. The left column shows total head in feet and meters. The top row shows array wattage/number and suggested type of modules. Boxes show seasonal pump performance and maximum flow.

Select the row with the head (total lift) that most closely matches your application. Move across the row to the column that contains the desired daily volume or peak flow rate. Note the pump model in that block and wattage of the PV array in that column.

60 SQF-3

= Pump model

24,885

= Estimated daily summer volume (GPD)

19,944

= Estimated daily winter volume (GPD)

44

= Peak flow rate (gpm)

NOTE: Daily volume and flow calculations are calculated with Fresno, CA data at a 36° tilt in July, at 7.8 kWH/m2. Winter calculations are calculated with Fresno, CA data at a 36° tilt in February, at 4.7 kWH/m2. Most solar pumping systems will give significantly more output in the summer than in the winter. Also, up to 40% more water can be pumped in the summer if the array is on a tracking mount (these estimates are for non-tracking array mounting). The output can vary with different locations and years, and is not guaranteed. Contact an AEE technical person for sizing your specific system.


Grundfos SQFlex pumps and accessories Item code

SQFlex 3 SQF-2 pump - 3"

075-01012

SQFlex 3 SQF-3 pump - 3"

075-01013

SQFlex 6 SQF-2 pump - 3"

075-01015

SQFlex 6 SQF-3 pump - 3"

075-01016

SQFlex 11 SQF-2 pump - 3"

075-01018

SQFlex 16 SQF-10 pump - 4"

075-01020

SQFlex 25 SQF-3 pump - 4"

075-01021

SQFlex 25 SQF-7 pump - 4"

075-01025

SQFlex 40 SQF-3 pump - 4"

075-01027

SQFlex 40 SQF-5 pump - 4"

075-01028

SQFlex 60 SQF-3 pump - 4"

075-01029

SQFlex extended 5-year warranty

075-01001

IO50 On/Off switch

075-01038

IO101 interface box (115V)

075-01036

IO102 wind interface box

075-01040

CU200 interface for multiple sources

075-01033

Level switch (use with CU200 only)

075-01042

Pressure switch (use with CU200 only)

075-01044


Estimated Water Production from SQFlex Pumps

(Summer and winter volumes and peak flow rates based on solar array wattage)

Head (Module watts) 230 230 230 230 230 230
feet X (# of modules) 2 3 4 5 6 7
(m) = (Array watts) 460 690 920 1150 1380 1610

6

(2)

Model 60 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3

7.8 kWh/m2

24,885

31,609

37,627

42,809

46,335

49,272

4.7 kWh/m2

19,944

26,177

31,410

35,264

38,204

40,675

Max flow

42

52

61

68

73

77

25

(8)

Model 40 SQF-3 40 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3

7.8 kWh/m2

13,027

20,089

26,345

31,950

35,680

38,605

4.7 kWh/m2

9,539

15,049

19,889

24,146

27,295

30,149

Max flow

24

35

47

56

62

66

50

(15)

Model 11 SQF-2 25 SQF-7 40 SQF-5 40 SQF-5 40 SQF-5 40 SQF-5

7.8 kWh/m2

5,582

9,725

14,817

19,166

22,462

25,183

4.7 kWh/m2

4,287

7,100

10,684

13,909

16,552

18,838

Max flow

9.6

19

27

35

40

44

75

(23)

Model 11 SQF-2 11 SQF-2 25 SQF-7 25 SQF-7 25 SQF-7 40 SQF-5

7.8 kWh/m2

4,580

6,300

9,221

11,832

13,742

17,381

4.7 kWh/m2

3,410

5,067

6,691

8,624

10,157

12,345

Max flow

8

11

17

21

27

31

100

(30)

Model 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 25 SQF-7 25 SQF-7

7.8 kWh/m2

3,606

5,617

6,695

7,303

10,833

12,536

4.7 kWh/m2

2,639

4,182

5,439

6,021

7,662

9,065

Max flow

6.4

10

12

14

19

22

125

(38)

Model 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 25 SQF-7

7.8 kWh/m2

2,897

4,769

6,145

6,915

7,286

10,006

4.7 kWh/m2

2,085

3,435

4,807

5,536

5,974

7,055

Max flow

5.3

8.3

11

12

14

18

150

(46)

Model 6 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 25 SQF-7

7.8 kWh/m2

2,454

4,041

5,675

6,565

6,952

7,844

4.7 kWh/m2

1,851

2,903

4,198

5,114

5,543

5,397

Max flow

4.5

7.2

10

12

12

13

175

(53)

Model 6 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2

7.8 kWh/m2

2,282

3,450

5,024

6,114

6,633

6,926

4.7 kWh/m2

1,672

2,442

3,594

4,682

5,233

5,531

Max flow

4.1

6.3

8.8

11

12

12

200

(61)

Model 6 SQF-2 6 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2

7.8 kWh/m2

2,050

2,885

4,237

5,593

6,199

6,586

4.7 kWh/m2

1,480

2,288

3,015

4,036

4,777

5,207

Max flow

3.8

5.4

7.6

10

12

12

250

(76)

Model 6 SQF-2 6 SQF-2 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3

7.8 kWh/m2

1,584

2,585

3,556

4,509

5,440

6,477

4.7 kWh/m2

1,097

1,970

2,632

3,315

3,969

4,656

Max flow

3

4.9

5.5

7.5

9.6

11

300

(91)

Model 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3

7.8 kWh/m2

1,524

2,516

3,058

3,379

3,556

3,628

4.7 kWh/m2

1,091

1,835

2,439

2,752

2,957

3,058

Max flow

2.8

4.5

5.7

5.9

5.9

5.9

400

(122)

Model 3 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3

7.8 kWh/m2

974

1,859

2,613

3,025

3,216

3,365

4.7 kWh/m2

719

1,315

1,942

2,360

2,564

2,737

Max flow

1.8

3.4

4.8

5.7

5.7

5.7

500

(152)

Model 3 SQF-3 3 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3

7.8 kWh/m2

814

1,287

2,000

2,593

2,857

3,025

4.7 kWh/m2

585

987

1,402

1,902

2,212

2,398

Max flow

1.5

2.4

3.7

4.9

5.5

5.5

650

(198)

Model 3 SQF-3 3 SQF-3 3 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3

7.8 kWh/m2

498

990

1,298

1702

2149

2415

4.7 kWh/m2

316

692

1,015

1107

1473

1819

Max flow

0.9

1.9

2.5

2.6

4.1

4.9

800

(244)

Model

--

-- -- 6 SQF-3 6 SQF-3 6 SQF-3

7.8 kWh/m2

--

--

--

871

1325

1741

4.7 kWh/m2

--

--

--

470

796

1111

Max flow

--

--

--

1.6

2.5

3.4

 Designing a Grundfos Solar Water Well Pumping System

When evaluating an existing well for conversion to a solar pumping system, the following questions must be answered:

  • What is the size of the well casing?
  • How deep is the well?
  • What is the depth to the water surface?
  • How much water will the well produce - the replenishment rate?
  • What is the draw-down level during water flow?
  • Is the water free of silt and sand?
  • How many gallons of water will be needed each day?

 

The different models of grundfos SQFlex pumps are rated for varying depths of head. The first step in choosing the correct pump is to determine what the total depth of head is. This is usually the distance from static water level in the well to the top of the well head and any additional head distance to the final delivery location such as a cistern or tank. If the final delivery location is to a pressure tank then the required PSI rating must be taken into account and the total depth of head adjusted e.g . Pressurizing 1 PSI = lifting 2.31 feet. Pressurizing to 43 PSI (a typical pressure setting)

The Grundfos video below is out of date on some components but gives general information on installing solar water pumping systems.

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