03 Sep 11 18:07, TOM WALKER wrote to ROY WITT:   
      
      
    RW>> The difference of course is in how much it costs to run the   
    RW>> compressor. In an industrial environment, running anything on 110v   
    RW>> costs twice as much to run as the same piece of equipment on 220v.   
    RW>> Even less if it's 220v 3 phase.   
      
    TW> That statement got lost in this old Brain. cost of rinning an   
    TW> electric motor for an air compressor is a function of the horsepower   
    TW> of the motor.   
      
   No, it's more than that. When you use 110v at 10amps to run an electric   
   motor, it will cost you twice as much as a 220v motor, because the 220v   
   motor will use half the amps.   
      
    TW> There is very little difference is electrical KW usage of runing on   
    TW> 110 or 220.   
      
   Except that the amperage used is twice as much in the 110v motor as it   
   would  be in a 220v motor pulling the same load.   
      
   Power used in Watts is equal to Amperage times Voltage.   
      
   Or,   
      
   Amps = Power in Watts divided by Voltage.   
      
   5000 Watts of Power / 220v = 22.7 Amps.   
   5000 Watts of Power / 110v = 45.5 Amps.   
      
    TW> Now of course the 110 motor consumes twice the amps but that is   
    TW> cancled out by twice the voltage used for a 220 motor.   
      
   Nope. As indicated above, 220v is more efficient than 110v...by 3 Amps.   
      
   And at the end of the day, you're not charged by the voltage used, but by   
   the Power you have consumed. If there's 220v available, why use 110v?   
      
    TW>  The Kilowatt Metered usage onthe power company meter is the   
    TW> same horsepower for horsepower.   
      
   As indicated above, equal power usage leads to doubled amperage use on a   
   110v motor thus leading to a higher bill at the end of the month.   
      
   Your bill is determined by how much wattage you use, not by how much   
   horsepower your motor is rated.   
      
                   R\%/itt   
      
      
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