Loading... Please wait...Robison solar well pump - model BL40Q - Brushless motor which operates on DC voltages of 12.6 to 40 VDC. Positive displacement which can be run dry without damage.Quad pistons. Up to 1700 gallons per day @ 4 gpm max. See the specification information for the BL40Q pump. Requires a well casing of 5" or larger. Sand filter included. 2 year warranty. A solar boss controller can also be purchased which includes a tank level sensor, battery charger and allows solar pumps to run better, especially in low light conditions. An ALC1275 level controller can also be purchased which turns pump on/off depending on tank/trough water levels.