Calculators

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.