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Sizing your Stationary Generator

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: Fill in the HP of the motor(s) in their starting sequence, select the start method (DOL - Direct On Line or Star Delta) and press Calculate. 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.