What power? How can calculate Kva or Kw?

Try to use the following formulas

  • HP = Horsepower
  • kW = Kilo Watts
  • kVA = Kilo Volt Amps
  • I = Ampere
  • V = Volts
  • PF = Power Factor
  • GE = Gruppo Elettrogeno
Ampere (I), kwown kVA.
1, 2, 3

from kVA to kW
kVA   kW
from kW to kVA
kW   kVA

from kW to HP
kW   HP

What size genset is needed to start a 3 phase electric motor Direct on Line (DOL) start
HP motore   kVA del GE

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

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.