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Compressor System Operating Calculator

Use the Compressor System operating cost calculator to estimate the energy cost of any Industrial or commercial three-phase compressor. Assuming that the compressor is 95% loaded is usually fine for a quick estimate of compressor energy usage. If a more accurate estimate is desired, have a trained technician connect a portable meter that reads out true kW, and put that in instead of estimating part load. Measuring amps alone is not a good estimating procedure for lightly loaded motors.

If you do not have a true power meter or a meter that will give you power factor, ask your electric utility if they can help. Have their trained technician connect it using the proper safety equipment and procedures.

Your Name  
Facility Name  
Compressor system  

Compressor Nameplate Information
Horsepower  

Motor Nameplate Efficiency
Use typical efficiency for older standard efficiency, 1800 rpm, Totally Enclosed Fan Cooled (Industrial duty) motor this size. This feature works 1-200 hp only.  %

Enter nameplate efficiency   %

Compressor Load estimate
Enter estimated load as a percent of full load   %

Input actual true power meter data   kW

Operating schedule
  • How many hours does the equipment operate per year? hours
  • One shift = 2,000 hours per year
  • Two Shifts = 4,000 hours per year
  • Three shifts plus weekends = 8,000 per year
  • Around the clock = 8,760 hours per year

    Average Electric cost: $ /kWh
  		• Wisconsin Industrial average $0.04 /kWh
  		• Wisconsin Commercial average $0.06 /kWh
  		• National Average industrial $0.05 /kWh
  		• To calculate your average electric cost, divide your annual electric cost by your annual kWh consumption. This gives an average or "blended" rate that includes demand and energy charges

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