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* A metric horsepower of 75 kgf-m per second is equivalent to 735.499 watts. * A boiler horsepower is used for rating steam boilers and is equivalent to 34.5 pounds of water evaporated per hour at 212 degrees Fahrenheit, or 9,809.5 watts. * One horsepower for rating electric motors is equal to 746 watts.
Rated Power is the maximum power (hp or kW) the engine can produce. Rated Speed is the engine rpm where this peak power occurs. The plot below for example would have the following specs: Rated Speed = 2800rpm. Rated Power = 390 hp. Peak Torque = 735 lb-ft.