VA to kW calculation formula
P(kW) = S(VA) × PF / 1000
The real power P in kilowatts (kW) is equal to the apparent power S in volt-amps (VA), multiplied by the power factor PF, divided by 1000.
kW = VA x PF / 1000
kilowatt = volt-amp x PF / 1000
Power (S) = 1500VA
PF = 0,3
Power (P) = 1500VA x 0,3 / 1000 = 0,45kW