Cost to operate a 25 HP Motor...

[Woodhog]

Would anyone know the approximate cost to operate a 25 HP motor .

The power supplied to the motor is 220 VAC

I dont know what the power factor is....maybe one could be assumed??

The power cost is $0.08 per KW hour....

The motor would be operating under almost full load conditions...

Thanks

[olyman]

draws 57 amps at full load----whew!!! watts=volts x amps-----i figure about 1.00 per hour??? theres also effiiciency factors and such---

[Trent]

Sounds cheap compared to gas.

[Riles]

25 horsepower is about 18.6 KW, so that'd be $1.49 an hour. Your mileage may vary.

[Dave Shepard]

That's cheap. Just think how many gallons of fuel a 50 horse gas or diesel burn in an hour! My L48 (48 gross hp) will burn about 5 quarts an hour, and it runs at full throttle all day. It might burn 6 quarts if I am doing some heavy fieldmowing. So maybe $3.75-$4.50 per hour?

Dave

[logwalker]

Unless I am mistaken you are figuring full load amps and the actual load will average quite a bit less than that. I saw with a 15 hp and can hardly notice it on my $100 average bill. Joe

[Trent]

Assuming $.08 per KWH, the cost (per hour) While at 57 amps:

[(57*220)/1000]*.08 = $1.0032 

The figures above are based on a single phase motor.

It would be interesting to estimate an average current while the mill is in use. Motors draw a fraction of the full load amps when at or near "no load".

Of course this depends on the mill. Some may be fully loaded half the time? My mill, (motor taking it easy while I'm doing bull work) would be fully loaded maybe 20% of the time.

Remember too, an electric motor HP is more than a gas engine HP, or so they say.

[Riles]

25 hp = 18,642.5 Watts according to my calculator.
18.6 KW * $.08 = $1.488 per hour.
At 18.6KW / 220V the motor draws 84.5 amps.

But this is all theoretical. I agree, the motor isn't going to draw max power continuously.

[olyman]

aint no way that 25 is on single phase---10 is almost max for single phase--

[Handy Andy]

  A neighbor wanted to hook  up a circle mill with electric motor to the local power company.  They wanted a " load fee".  Don't know how many hp.  They said it was some thousands of dollars, so they bought a diesel engine.  How many hp can you turn on and not dim the neighbors lights?

[Dave Shepard]

10 HP single phase.
As many HP as you can afford three phase.

You can run a lot of HP off of a phase converter as well.


Dave

[FiremanEd]

  A neighbor wanted to hook  up a circle mill with electric motor to the local power company.  They wanted a " load fee".  Don't know how many hp.  They said it was some thousands of dollars, so they bought a diesel engine.  How many hp can you turn on and not dim the neighbors lights?

You can add a "soft starter" for about $2K that'll start the large motors without a power drawdown. I start a 150 on a grinder/hog without any notice on the lights in the building. It's computerized and only give a fraction of the power to the motor until it's up to full speed, then it throws full power at it.

[mike_van]

Where I am the power co. has a "demand charge" for commercial places, and they define commercial by the size motor you run.  Under 5 hp, you're o.k., over that they call you a business. The demand is measured by your meter every month in 15 min. increments, the most load in KW for any of those 15 mins. is your demand. This is also your minimum monthly bill. Could be hundreds or even thousands per month, even if you don't run the machine. 3 phase is automatically commercial. I can't imagine running a 25 hp off a single phase service.

[easymoney]

you can run a 3 phase 25 hp. motor on a 200 amp single phase service. just use a pony motor to spin it up to speed before applying power it will  not  make full power tho. while it is running it will make the third leg for smaller motors if needed. i had one that i ran that way. it generated the third leg for a 5 hp dust blower and a 10 hp motor on a resaw. somewhere i read about someone that ran a 40 hp motor on 220 single phase 200 amp service.

[Dave Shepard]

I can't imagine running a 25 hp off a single phase service.

Bibbyman does it everyday. It can be more economical to run the phase converter than to pay the demand charge.


Dave