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

    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*

     

    * Please NOTE the above calculations are an estimate only because other factors such as site conditions, motor efficiencies and iron losses are not taken into consideration.