{ $fields.summary }
Shaft power (kW)P = ρ · g · Q · H / (1000 · η)
ρ is density (≈1000 kg/m³ water), g≈9.81, Q flow (m³/s), H head (m), η pump efficiency (0.6–0.8).
Example
Q=60 m³/h (0.0167 m³/s), H=30 m, η=0.7: P≈1000×9.81×0.0167×30/1000/0.7 ≈ 7 kW.
Yearly power cost
Add motor and VFD losses, run 8000 h/yr at US$0.12/kWh → 7×8000×0.12 ≈ US$6,700. A high-efficiency pump pays back fast.