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Thad's Tip: Off Grid Solar Submersible Pump Cable Selection Chart

Click here to view, print, or download the Off Grid Solar Submersible Pump Cable Sizing Chart.pdf

Buy 10 gauge 2 conductor, no ground, submersible pump cable for your Shurflo 9300 Solar Well Pump

Buy 10 gauge 2 conductor with ground, submersible pump cable for your Grundfos SQFlex Solar Well Pump

Sized for 3% power loss in the cable
 Number of 250 watt, 60 cell solar panels in series
 

Solar water pump array watts
 

Maximum cable length in feet   
14 gauge 12 gauge 10 gauge 8 gauge
2 500 45 70 110 175
3 750  65  105  165  260
4  1000  85  140  220  345
5  1250  105  170  275  430
6  1500  130  205  330 520
7  1750  150  240  380 605

 

Formula used to determine the submersible pump cable length:

L = (P x C x (Vmp) x (Vmp)) / (Wp x .00162)

where

L = Length of cable in feet

P = Power loss in percent, entered as a whole number such as 3

C = Area of cross section of submersible pump wire in square inches

Vmp = Maximum power voltage of the array

Wp = Peak watts

and .00162 is a conversion factor for percentage and cable with copper wire and 2 conductors

Source: Grundfos SQFlex Product Guide Dec. 2011 page 37

Wire Gauge Wire cross section area, in2
8 .012958
10 .008184
12 .005130
14 .003224