Diesel Generator Capacity Calculations

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

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

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Converting kVA to kW   kVA = kW

Converting kW to kVA   kW = kVA

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Converting kW to HP
 

kW	=	HP

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What size genset is needed to start a 3 phase electric motor Direct on
Line (DOL) start
 

HP of Motor	=	Generator kVA Required

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Generator Size to Start Motors
Instructions: You only need to fill in the columns colored in blue.
Fill in the HP of the motor(s) in their starting sequence, 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 efficiency and iron losses are not taken into consideration.