AWP Labs · Power
Pump power & energy cost
Calculates hydraulic and brake horsepower, electrical demand and annual energy cost from flow and pressure, then shows what a more efficient pump would save.
Your inputs
From the pump curve at the duty point.
Compare against a better-matched or higher-efficiency pump.
Results
Annual energy cost
$46,829
425,715 kWh a year at $0.11/kWh
- Electrical demand
- 48.6kW
- Brake horsepower
- 61.3hp
- at the pump shaft
- Hydraulic power
- 45.9hp
- delivered to the water
- Specific energy
- 2.31kWh/kgal
- 0.611 kWh/m³
- Daily energy
- 1,166kWh
- Wire-to-water
- 70.5%
- overall efficiency
Annual cost by pump efficiency
A 84% efficient pump would save about $5,017 a year and cut demand by 5.21 kW.
How this is calculated
Hydraulic power. Water hp = Flow (gpm) × Pressure (psi) ÷ 1,714.
Electrical demand. Brake hp = Water hp ÷ Pump efficiency and kW = Brake hp × 0.7457 ÷ Motor efficiency.
Cost. Annual cost = kW × hours per day × 365 × $/kWh. Specific energy is kW divided by thousands of gallons pumped per hour.
Assumptions
- Water at about 60 °F with a specific gravity of 1.0.
- Constant flow and pressure for the hours entered.
- Demand charges and power factor are not included.
A preliminary estimate for planning. AWP confirms every figure against your water, site and permit before quoting.
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