Solar Water Pump
PV capacity needed for a DC/AC solar pump.
DesignInputs (SI units)
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Engineering Formula
- E_hydraulic = ρ × g × Q × H / 3.6×10⁶ [kWh/day]
- E_electrical = E_hydraulic / η_pump
- P_pv = E_electrical / (PSH × η_inv)
Hydraulic energy uses ρ=1000 kg/m³ and g=9.81 m/s². Electrical demand divides by combined pump+motor efficiency; PV capacity divides by PSH.
Step-by-step Calculation
- 1.Hydraulic
ρgQH/3.6e62.453 kWh - 2.Electrical
/η5.45 kWh - 3.PV
/(PSH×η_inv)1.14 kWp
Design Assumptions
- • Water density 1000 kg/m³.
- • Inverter/VFD efficiency 96%.
Engineering Tips
- ◆Add 20% margin for cloudy days and pipe friction.
- ◆Use MPPT VFD drives for AC submersibles.
Warnings
- ▲Never dry-run submersible motors — install level sensors.
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