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Old 01-11-2017, 09:56 AM   #1
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Default Cost to run motor

It's been years since I did any calaculations. Plant manager wants to know about how much it costs to run a 10 hp motor 5 days a week 24 hours a day.

I know 10 hp is 7.35 kw.
I think we pay $0.15 kw/hr

Worst case is 7.35x .15 x 24hrs x 5 days
Now I multiply by 3 for three phase or 1.7
I know full load and power factor come in to it, but is it correct so far.

Thanks
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Old 01-11-2017, 11:29 AM   #2
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Of course, you pay for Watts and if the service is large enough, also VARs.

With a motor, Watts = HP X efficiency. PF only matters if you're being billed for VARs.

Single or 3 doesn't matter, Watts is the same with either system, though motor efficiency would be different.
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Old 01-11-2017, 11:46 AM   #3
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So $135? Seems about right.
My city charges .066 inn the winter and .10 in the summer. .15 would suck.
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Old 01-11-2017, 01:24 PM   #4
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I remember a customer asking a Baldor rep once about the cost of running a 100 hp motor 24-7-365.
It was more than my annual salary. I don't remember the exact figures. But I think it was around $100.000 a year.
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Old 01-11-2017, 02:52 PM   #5
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Quote:
Originally Posted by just the cowboy View Post
It's been years since I did any calaculations. Plant manager wants to know about how much it costs to run a 10 hp motor 5 days a week 24 hours a day.

I know 10 hp is 7.35 kw.
I think we pay $0.15 kw/hr

Worst case is 7.35x .15 x 24hrs x 5 days

Harvey
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Old 01-11-2017, 03:08 PM   #6
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Around $135 per week.
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Old 01-11-2017, 03:26 PM   #7
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A 10HP motor has a RATED CAPACITY of 10HP but just because a motor is rated for 10HP does NOT mean it is running at 10HP. LOAD is what you pay for, not CAPACITY. If your load only demands 5kW from that motor, you consume 5kW, plus a little bit in losses through the motor, maybe 3-5%.

If someone wants an ACCURATE representation of cost, you must put a WH meter on it. Some newer Solid State Overload Relays can be set up to give you that info as well. Without actually measuring the kW being consumed and for how long, you can only guess.
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