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Grundfos SQFlex Submersible Pump Selection Chart

Grundfos SQFlex Pump and Array Sizing

To choose a pump and array size appropriate to your project, consult the table below. The left column shows total head in feet and meters, the top row shows array wattage/number and suggested type of modules, and the boxes show seasonal pump performance and maximum flow. Select the row with the head (total lift) that most closely matches your application then 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.

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Table Key

60 SQF-3  Pump model
24,885  Estimated daily summer volume (GPD)
19,944  Estimated daily winter volume (GPD)
42  Peak flow rate (gpm)

NOTE: Daily volume and flow calculations in the table are based on Fresno, CA data at a 36° fixed tilt. Daily summer volume assumes 7.8  kWh/m2/day of insolation and winter volume assumes 4.7 kWh/m2/day. These figures will need to be adjusted to the local insolation  conditions at the actual installation site.

Most solar pumping systems will provide significantly more output in the summer than in the winter. The typical flow rate is calculated at 800 W/m2 and can be up to 25% greater under bright conditions. Also, up to 40% more water can be pumped in the summer if the array is on a tracking mount. The output can vary by location and weather patterns, and is not guaranteed.

View PDF Version of Grundfos SQF Pump Selection Chart
Grundfos SQFlex Pump and Solar Panel Array Sizing
HEAD MODULE WATTS 230 WATT 60-CELL MODULES
X # of modules 2 3 4 5 6 7
= Array watts 460 W 690 W 920 W 1150 W 1380 W 1610 W
6' (2 m)
Model 60 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3
7.8 kWh/m2 24885 gpd 31609 gpd 37627 gpd 42809 gpd 46335 gpd 49272 gpd
4.7 kWh/m2 19944 gpd 26177 gpd 31410 gpd 35264 gpd 38204 gpd 40675 gpd
Max flow 42 gpm 52 gpm 61 gpm 68 gpm 73 gpm 77 gpm
25' (8 m)
Model 40 SQF-3 40 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3 60 SQF-3
7.8 kWh/m2 13027 gpd 20089 gpd 26345 gpd 31950 gpd 35680 gpd 38605 gpd
4.7 kWh/m2 9539 gpd 15049 gpd 19889 gpd 24146 gpd 27295 gpd 30149 gpd
Max flow 24 gpm 35 gpm 47 gpm 56 gpm 62 gpm 66 gpm
50' (15 m)
Model 11 SQF-2 40-SQF-5 40 SQF-5 40 SQF-5 40 SQF-5 40 SQF-5
7.8 kWh/m2 5582 gpd 10139 gpd 14817 gpd 19166 gpd 22462 gpd 25183 gpd
4.7 kWh/m2 4287 gpd 7001 gpd 10684 gpd 13909 gpd 16552 gpd 18838 gpd
Max flow 9.6 gpm 19 gpm 27 gpm 35 gpm 40 gpm 44 gpm
75' (23 m)
Model 11 SQF-2 11 SQF-2 25 SQF-7 25 SQF-7 40 SQF-5 40 SQF-5
7.8 kWh/m2 4580 gpd 6300 gpd 9221 gpd 11832 gpd 14602 gpd 17381 gpd
4.7 kWh/m2 3410 gpd 5067 gpd 6691 gpd 8624 gpd 10184 gpd 12345 gpd
Max flow 8.0 gpm 11 gpm 17 gpm 21 gpm 27 gpm 31 gpm
100'(30 m)
Model 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 25 SQF-7 25 SQF-7
7.8 kWh/m2 3606 gpd 5617 gpd 6695 gpd 7303 gpd 10833 gpd 12536 gpd
4.7 kWh/m2 2639 gpd 4182 gpd 5439 gpd 6021 gpd 7662 gpd 9065 gpd
Max flow 6.4 gpm 10 gpm 12 gpm 14 gpm 19 gpm 22 gpm
125' (38 m)
Model 11 SQF-2 11 SQF-2 11 SQF-2 16 SQF-10 16 SQF-10 25 SQF-7
7.8 kWh/m2 2897 gpd 4769 gpd 6145 gpd 7864 gpd 7693 gpd 10006 gpd
4.7 kWh/m2 2085 gpd 3435 gpd 4807 gpd 5833 gpd 5664 gpd 7055 gpd
Max flow 5.3 gpm 8.3 gpm 11 gpm 12 gpm 14 gpm 18 gpm
150' (46 m)
Model 6 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 16 SQF-10
7.8 kWh/m2 2454 gpd 4041 gpd 5675 gpd 6565 gpd 6952 gpd 7535 gpd
4.7 kWh/m2 1851 gpd 2903 gpd 4198 gpd 5114 gpd 5543 gpd 5531 gpd
Max flow 4.5 gpm 7.2 gpm 10 gpm 12 gpm 12 gpm 13 gpm
175' (53 m)
Model 6 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2
7.8 kWh/m2 2282 gpd 3450 gpd 5024 gpd 6114 gpd 6633 gpd 6926 gpd
4.7 kWh/m2 1672 gpd 2442 gpd 3594 gpd 4682 gpd 5233 gpd 5531 gpd
Max flow 4.1 gpm 6.3 gpm 8.8 gpm 11 gpm 12 gpm 12 gpm
200' (61 m)
Model 6 SQF-2 6 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2
7.8 kWh/m2 2050 gpd 2885 gpd 4237 gpd 5593 gpd 6199 gpd 6586 gpd
4.7 kWh/m2 1480 gpd 2288 gpd 3015 gpd 4036 gpd 4777 gpd 5207 gpd
Max flow 3.8 gpm 5.4 gpm 7.6 gpm 10 gpm 12 gpm 12 gpm
250' (76 m)
Model 6 SQF-2 6 SQF-2 6 SQF-2 11 SQF-2 11 SQF-2 11 SQF-2
7.8 kWh/m2 1584 gpd 2585 gpd 3056 gpd 4202 gpd 5268 gpd 5816 gpd
4.7 kWh/m2 1097 gpd 1970 gpd 2466 gpd 2872 gpd 3720 gpd 4425 gpd
Max flow 3.0 gpm 4.9 gpm 5.5 gpm 7.5 gpm 9.6 gpm 11 gpm
300' (91 m)
Model 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3
7.8 kWh/m2 1524 gpd 2516 gpd 3058 gpd 3379 gpd 3556 gpd 3628 gpd
4.7 kWh/m2 1091 gpd 1835 gpd 2439 gpd 2752 gpd 2957 gpd 3058 gpd
Max flow 2.8 gpm 4.5 gpm 5.7 gpm 5.9 gpm 5.9 gpm 5.9 gpm
400' (122 m)
Model 3 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3
7.8 kWh/m2 974 gpd 1859 gpd 2613 gpd 3025 gpd 3216 gpd 3365 gpd
4.7 kWh/m2 719 gpd 1315 gpd 1942 gpd 2360 gpd 2564 gpd 2737 gpd
Max flow 1.8 gpm 3.4 gpm 4.8 gpm 5.7 gpm 5.7 gpm 5.7 gpm
500' (152 m)
Model 3 SQF-3 3 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3 6 SQF-3
7.8 kWh/m2 814 gpd 1287 gpd 2000 gpd 2593 gpd 2857 gpd 3025 gpd
4.7 kWh/m2 585 gpd 987 gpd 1402 gpd 1902 gpd 2212 gpd 2398 gpd
Max flow 1.5 gpm 2.4 gpm 3.7 gpm 4.9 gpm 5.5 gpm 5.5 gpm
650' (198 m)
Model 3 SQF-3 3 SQF-3 3 SQF-3 3 SQF-3 6 SQF-3 6 SQF-3
7.8 kWh/m2 498 gpd 990 gpd 1298 gpd 1470 gpd 2149 gpd 2415 gpd
4.7 kWh/m2 316 gpd 692 gpd 1015 gpd 1170 gpd 1473 gpd 1819 gpd
Max flow 0.9 gpm 1.9 gpm 2.5 gpm 2.6 gpm 4.1 gpm 4.9 gpm
800' (244 m)
Model 6 SQF-3 6 SQF-3 6 SQF-3
7.8 kWh/m2 871 gpd 1325 gpd 1741 gpd
4.7 kWh/m2 470 gpd 796 gpd 1111 gpd
Max flow 1.6 gpm 2.5 gpm 3.4 gpm

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