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Power Calculator
Date Added: December 22, 2007 01:22:52 AM
Author:
Category: Electrical

These calculators will assit you in determining what size generator you may require or how to convert one unit of electricity to another.

They calculate:
  • Amperes when kVA is known
  • Converting kVA to kW
  • Converting kW to kVA
  • Converting kW to HP
  • kVA Required to run motors
    		•
    Guide to units:
    HP = Horsepower
    kW = Kilo Watts
    kVA = Kilo Volt Amps    		 I = Ampere or Current
    V = Volts
    PF = Power Factor

    Sizing Data - Power Consumption

    Calculating Ampere (I), given kVA.
    Phase
    1, 2, 3    		 Generator
    kVA    		 Volts
    Required    		 = Ampere
    I

     

    Converting kVA to kW
    kVA = kW
    Converting kW to kVA
    kW = kVA

    Converting kW to HP
    kW = HP
    What size genset is needed to start a 3 phase electric motor Direct on Line (DOL) start
    HP of
    Motor    		 = Generator
    kVA Required

    Generator Size to Start Motors

    Instructions: You only need to fill in the columns coloured in blue.
    Fill in the HP of the motor(s) in their starting squence, select the start method (Direct On Line or Star Delta) and press Evaluate. The required generator size will then be displayed at the bottom.

    3 Phase (415 volt @ 50Hz)
    1 Phase (240 volt @ 50Hz)

    Starting Sequence Motor HP Start Method
    DOL / StarDelta    		 Run Variable Phase Current Starting Value Total Run Current Total Start Current
    1 /
    2 /
    3 /
    4 /
    5 /
    6 /
    Generator Size for Starting with: kVA*
    Generator Size for Running with: kVA*
    Generator Size Recommended: kVA*

     

    Source: http://www.macgen.com/calcul.html
     
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