Motor Input Power, Annual Energy, and Cost
The input kilowatts a motor draws at its efficiency (HP x 0.746 x load / efficiency), the annual kilowatt-hours at a given duty, and the energy cost, with the efficiency-driven delta that justifies a premium-motor retrofit. The energy charge only; the utility tariff governs demand, time-of-use, and power-factor penalties.
Formula and source
input_kW = HP x 0.746 x (load_factor/100) / (efficiency/100); annual_kWh = input_kW x run_hours; annual_cost = annual_kWh x rate. The 0.746 kW/HP is the mechanical-to-electrical conversion.
First-principles electrical-input power and the 0.746 kW-per-HP identity.
Audience
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Posture
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