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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.
Alternator Technical Notes. How much horsepower is your alternator using? Using Ohms Law: The formula to find power (watts) using Ohms Law is P = I X E or Power = Current X Voltage I = 50 amps (alternator rating) E = 14.9 volts (set voltage of alternator when engine is running) 50 amps X 14.9 volts = 745 watts.