Free Solar Water Pump Sizing Calculator
Enter your total head (vertical lift + pipe friction, in metres) and the flow you need (daily water ÷ ~6 peak sun hours, in m³/h) — the calculator instantly shortlists matching models from all 209 Aquasolar pumps, with a built-in 1.2× safety margin, the recommended PV array and cable size for each. Free, no sign-up, no email required.
How Solar Water Pumping Works
1 · Total head (m)
Vertical lift from water level to outlet, plus pipe losses
2 · Required flow (m³/h)
Daily water need ÷ sun hours (≈ 6 h/day)
3 · PV
Two numbers decide it: total head (vertical lift plus pipe losses) and required flow. Use our online Pump Selector for an instant shortlist. For panels, size the PV array at roughly 1.3–1.5× the pump’s rated power — every datasheet lists the recommended array for each model.
Frequently Asked Questions
How do I work out my total head?
Total head = vertical distance from the water level to the highest outlet, plus pipe friction (roughly 10% extra for typical runs). For boreholes, measure from the drawdown water level, not the borehole depth.
How do I work out the flow I need?
Divide your daily water requirement by the local peak sun hours (about 6 in most sunny regions). A farm needing 30 m³ per day therefore needs a pump delivering about 5 m³/h.
Is the result a final selection?
It is a shortlist with a built-in 1.2× safety margin. Our engineers confirm the final model against the full performance curve, your water quality and your solar resource — free of charge, within 24 hours.