How to Use the Grundfos SQF Pump Sizing Table

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.

For Example:

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.
 

Estimated Water Production from Grundfos 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 44 55 64 73 78 82
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 27 40 52 61 67 70
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 11 20 32 40 45 49
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 9 12 20 24 27 37
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 7 12 12 12 23 26
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 6 9 12 12 12 21
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 5 9 12 12 12 18
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 5 8 11 12 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 4 5 9 12 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 4 5 7 9 11 13
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 3 5 6 6 6 6
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 2 4 6 6 6 6
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 2 3 5 6 6 6
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 1,702 2,149 2,415
4.7 kWh/m2 316 692 1,015 1,107 1,473 1,819
Max flow 1 2 3 4 5 5
800
(244)
Model     6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3
7.8 kWh/m2     421 871 1,325 1,741
4.7 kWh/m2     179 470 796 1,111
Max flow     1 3 4 4