Grundfos SQFlex Submersible Pumps
This is the ultimate submersible pump for water lifts of up to 650 feet. They can be directly powered by solar or wind power or can be run on an inverter, a generator, a battery or the utility grid, or any combination of these sources. Virtually any source of power, 30-300 VDC and 90-240 VAC, can be used to run the pump. They can operate on a series string of PV modules with a total peak power voltage over 30 volts, but the pumps efficiency will be much higher at voltages over 100 VDC. SQFlex 3 and 6 pumps will fit into a 3" well.
Seven pump models can deliver from 2 gpm at 600 feet to 65 gpm at 20 feet of head with a 1 kilowatt solar array or less. Helical rotor pumps (models 3, 6 and 11) for high head applications and centrifugal pumps for low head applications assure a pump that is efficient for any use. The SQFlex has built-in protection from dry-running, overload and overheating.
SQFlex submersible pumps have a 2 year warranty from the date of purchase. A 5 year extended warranty is available separately and highly recommended.
The Whisper 200-150 V wind generator can be connected directly to an SQFlex pump. Please contact us for information.
Optional Controls
The CU200 interface box communicates with the pump and monitors operating conditions. Built-in diagnostics indicate faults and dry-running, 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 a tank is full.
The IO100 is a simple control box with cable terminations and a manual on/off switch. It is a great interface between a solar array and the pump to allow you to turn off the high voltage array when working on the pump.
The IO101 is an interface for using AC backup on a solar pump. An automatic transfer switch disconnects the solar array when AC power from a generator, utility connection or inverter is present. When AC power stops, it automatically reconnects the array to let the sun continue pumping.
The IO102 interface unit is used for systems powered exclusively by a wind turbine or by a combination of wind and PV.
You can use several controls if you need more features than one control can provide.
The SQFlex pumps will not function with a GFCI in the supply circuit, and should not be used where a GFCI is required.
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Estimated Water Production from SQFlex Pumps
(Summer and winter volumes and peak flow rates based on solar array wattage)
|
|
Head
|
(Module watts)
|
85
|
85
|
85
|
85
|
175
|
175
|
175
|
175
|
|
feet
|
X (# of modules)
|
3
|
4
|
5
|
6
|
4
|
5
|
8
|
10
|
|
(m)
|
= (Array watts)
|
255
|
340
|
425
|
510
|
700
|
880
|
1400
|
1750
|
|
6
(2)
|
Model
|
60 SQF-3
|
60 SQF-3
|
60 SQF-3
|
60 SQF-3
|
60 SQF-3
|
60 SQF-3
|
60 SQF-3
|
60 SQF-3
|
|
7.5 kWh/m2
|
17,037
|
21,485
|
24,918
|
27,917
|
31,023
|
36,797
|
39,138
|
45,690
|
|
4.5 kWh/m2
|
12,520
|
15,986
|
18,732
|
21,256
|
25,518
|
29,229
|
33,549
|
39,613
|
|
Max flow
|
34
|
41
|
47
|
52
|
55
|
65
|
66
|
76
|
|
25
(8)
|
Model
|
40 SQF-5
|
40 SQF-5
|
40 SQF-5
|
40 SQF-5
|
60 SQF-3
|
60 SQF-3
|
60 SQF-3
|
60 SQF-3
|
|
7.5 kWh/m2
|
6,834
|
9,853
|
12,466
|
15,113
|
18,582
|
25,358
|
29,804
|
36,941
|
|
4.5 kWh/m2
|
3,944
|
6,219
|
8,305
|
10,319
|
12,489
|
17,744
|
23,459
|
29,319
|
|
Max flow
|
16
|
22
|
27
|
32
|
41
|
52
|
54
|
65
|
|
50
(15)
|
Model
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
25 SQF-6
|
40 SQF-5
|
40 SQF-5
|
40 SQF-5
|
|
7.5 kWh/m2
|
3,284
|
4,406
|
5,020
|
5,499
|
9,120
|
14,171
|
17,910
|
23,566
|
|
4.5 kWh/m2
|
2,195
|
3,061
|
3,803
|
4,375
|
6,170
|
9,060
|
13,517
|
18,316
|
|
Max flow
|
7
|
9
|
10
|
10
|
20
|
31
|
33
|
44
|
|
75
(23)
|
Model
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
25 SQF-6
|
25 SQF-6
|
40 SQF-5
|
|
7.5 kWh/m2
|
2,524
|
3,557
|
4,381
|
4,910
|
5,352
|
8,805
|
10,871
|
15,732
|
|
4.5 kWh/m2
|
1,588
|
2,343
|
3,035
|
3,684
|
4,314
|
5,703
|
8,387
|
11,880
|
|
Max flow
|
6
|
8
|
9
|
10
|
10
|
19
|
21
|
31
|
|
100
(30)
|
Model
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
16 SQF-10
|
16 SQF-10
|
|
7.5 kWh/m2
|
1,824
|
2,708
|
3,552
|
4,202
|
4,794
|
5,503
|
7,768
|
10,016
|
|
4.5 kWh/m2
|
1,015
|
1,648
|
2,277
|
2,868
|
3,667
|
4,445
|
6,036
|
7,875
|
|
Max flow
|
4
|
6
|
8
|
9
|
9
|
10
|
15
|
18
|
|
125
(38)
|
Model
|
6 SQF-2
|
6 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
16 SQF-10
|
16 SQF-10
|
|
7.5 kWh/m2
|
1,495
|
1,977
|
2,825
|
3,534
|
4,268
|
5,071
|
6,445
|
8,792
|
|
4.5 kWh/m2
|
891
|
1,370
|
1,704
|
2,248
|
3,012
|
3,988
|
4,930
|
6,823
|
|
Max flow
|
3
|
4
|
6
|
8
|
9
|
10
|
13
|
16
|
|
150
(46)
|
Model
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
16 SQF-10
|
|
7.5 kWh/m2
|
1,319
|
1,847
|
2,127
|
2,380
|
3,770
|
4,651
|
5,121
|
7,530
|
|
4.5 kWh/m2
|
758
|
1,179
|
1,591
|
1,888
|
2,506
|
3,551
|
4,180
|
5,771
|
|
Max flow
|
3.1
|
4.2
|
4.5
|
4.6
|
8.3
|
9.3
|
9.3
|
14.4
|
|
175
(53)
|
Model
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
|
7.5 kWh/m2
|
1,133
|
1,684
|
2,008
|
2,250
|
3,265
|
4,233
|
4,787
|
5,393
|
|
4.5 kWh/m2
|
624
|
1,009
|
1,407
|
1,741
|
2,029
|
3,058
|
3,874
|
4,450
|
|
Max flow
|
2.7
|
3.8
|
4.4
|
4.5
|
7.4
|
8.9
|
8.9
|
9.1
|
|
200
(61)
|
Model
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
11 SQF-2
|
11 SQF-2
|
11 SQF-2
|
|
7.5 kWh/m2
|
952
|
1,514
|
1,888
|
2,114
|
2,352
|
3,807
|
4,435
|
5,064
|
|
4.5 kWh/m2
|
493
|
867
|
1,207
|
1,583
|
1,903
|
2,552
|
3,536
|
4,153
|
|
Max flow
|
2.3
|
3.5
|
4.3
|
4.5
|
4.5
|
8.5
|
8.4
|
8.8
|
|
250
(76)
|
Model
|
3 SQF-2
|
3 SQF-2
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
11 SQF-2
|
11 SQF-2
|
|
7.5 kWh/m2
|
698
|
905
|
1,578
|
1,875
|
2,125
|
2,483
|
3,733
|
4,344
|
|
4.5 kWh/m2
|
422
|
644
|
890
|
1,183
|
1,639
|
2,017
|
2,816
|
3,493
|
|
Max flow
|
1.6
|
1.9
|
3.7
|
4.3
|
4.3
|
4.5
|
7.4
|
8.1
|
|
300
(91)
|
Model
|
3 SQF-2
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
11 SQF-2
|
|
7.5 kWh/m2
|
609
|
865
|
1,015
|
1,132
|
1,884
|
2,253
|
2,482
|
3,453
|
|
4.5 kWh/m2
|
355
|
555
|
750
|
890
|
1,282
|
1,785
|
2,050
|
2,700
|
|
Max flow
|
1.4
|
2.0
|
2.1
|
2.2
|
4.2
|
4.4
|
4.3
|
6.9
|
|
360
(110)
|
Model
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
6 SQF-2
|
|
7.5 kWh/m2
|
535
|
801
|
953
|
1,072
|
1,583
|
2,010
|
2,260
|
2,541
|
|
4.5 kWh/m2
|
294
|
484
|
669
|
827
|
918
|
1,458
|
1,839
|
2,108
|
|
Max flow
|
1.3
|
1.8
|
2.1
|
2.2
|
3.8
|
4.3
|
4.2
|
4.3
|
|
420
(128)
|
Model
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
|
7.5 kWh/m2
|
467
|
724
|
900
|
1,013
|
1,122
|
1,284
|
1,314
|
1,439
|
|
4.5 kWh/m2
|
247
|
423
|
599
|
762
|
910
|
1,062
|
1,109
|
1,239
|
|
Max flow
|
1.1
|
1.7
|
2.0
|
2.1
|
2.1
|
2.2
|
2.2
|
2.3
|
|
500
(152)
|
Model
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
|
7.5 kWh/m2
|
367
|
606
|
809
|
931
|
1,053
|
1,211
|
1,257
|
1,379
|
|
4.5 kWh/m2
|
180
|
337
|
489
|
651
|
828
|
990
|
1,052
|
1,186
|
|
Max flow
|
1.0
|
1.4
|
1.9
|
2.1
|
2.1
|
2.2
|
2.2
|
2.2
|
|
600
(183)
|
Model
|
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
3 SQF-3
|
|
7.5 kWh/m2
|
|
406
|
612
|
779
|
898
|
1,066
|
1,146
|
1,260
|
|
4.5 kWh/m2
|
|
190
|
321
|
454
|
664
|
855
|
952
|
1,063
|
|
Max flow
|
|
1.0
|
1.5
|
1.9
|
1.9
|
2.0
|
2.0
|
2.0
|
NOTE: Daily volume and flow calculations are based on 38° north latitude location, fixed array tilt of 38° and 4.5 kWH/m2 (POA) winter, and 7.5 kWH/m2 (POA) summer solar insolation. The pump model is optimized for summer operation. Up to 40% more water can be pumped in the summer if the array is on a tracking mount. The output can vary with different locations and years, and is not guaranteed.
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