Industrial Motor Energy Cost
Annual electricity use and cost of an electric motor from rated power, load, efficiency and running hours.
Inputs
kW
%
%
h
days
per kWh
Results
- Annual energy cost
- 12,774.19
- Annual energy
- 85,161 kWh
- Electrical input
- 17.74 kW
Formula
Input kW = Rated kW × load ÷ efficiency
kWh = Input kW × hours × days
Cost = kWh × price
Assumptions & limits
- Rated kW is shaft output (nameplate).
- Efficiency drops below ~50% load; use the part-load value from the datasheet.
Worked example
22 × 0.75 ÷ 0.93 = 17.74 kW × 4,800 h = 85,161 kWh × 0.15 = 12,774.19.