The right calculation
Total dynamic head (TDH) = pumping water level + drawdown + rise above ground + friction losses.
Hydraulic power (kW) = flow (m³/h) × TDH (m) ÷ 367.
Motor input power = hydraulic power ÷ (pump efficiency × motor efficiency).
Example: 40 m³/h at a TDH of 100 m gives 10.9 kW hydraulic. With a 65% pump and 85% motor, that needs about 19.7 kW at motor input.
The site calculator gives a quick estimate from the pump horsepower: three options of 1.1, 1.2 and 1.3 kW of panels per HP. The final operating point comes from the pump curve.
Our solar pumping experience covers 2 to 800 HP: submersible pumps and vertical and horizontal electric heads.
Submersible and electric head calculatorWhat we need from you
- Static water level and drawdown while pumping.
- Current motor power and type, with pipe diameter and length.
- Required flow and pumping hours.
- Pump cable length and where panels would go.
Solar pumping follows the sun. Early morning and evening output is lower, so we calculate daily water volume rather than assume constant flow.