Posted: 2/15/2012 2:37:28 PM EDT
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I have a 3/4 horse motor (22 of them) running 24/7. I need to know the cost per-hour to run this motor. It is a 208V single phase 2-pole motor pulling about 15 RLA.
Easy math? I can pull a power bill to get the costs. T |
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Typically, a 208v 3/4 hp motor pulls between 3.5-5 amps, depending on efficiency. 50% efficiency would pull about 5 amps, times 208v = 1.04 kwh. 22 motors = 22.9 kwh
times whatever your electric rate is (usually between 10-16 cents per kwh. Worst case, you would be paying between $2.29 - $3.66 per hour to run all 22 motors if they are only 50% efficient. |
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Rocky Mountain Power charges $0.07/kwh.
I'll say a 3/4 hp motor is pulling 560 watts. I'm lazy and just went to google to get a figure so YMMV. Since you have 22 of them take 22 x 560 = 12,320 watts or 12.32 kw. 12.32 kw x $0.07/kwh = $0.861/hour to run all 22. $0.861 / 22 = ~$0.04/hour to run each motor. $0.04 x 24 hours = $0.96. Figure each motor costs $1 to run for a 24 hour period. |