Additionally, on the solar water pumping project, SP should provide the well parameters: yield in liters per hour, depth to dynamic water level, distance from well to water tank, and diameters of delivery pipe and well. Then, a qualified engineer can verify the pump presented in the BoQ, and specify an alternative from Lorentz in the case that this pump is not available or is not the most efficient solution.
Typically, 5-10 pumps will provide the required water flow, but only one is ‘best’, defined by efficiency in water pumped per Watt of power from the modules. In addition, some applications may utilize a larger number of modules so that pumping starts earlier in the day and lasts longer into the afternoon. This may result in 10-40m3 of additional water per day in many South Sudan applications.