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Answer Posted / seank
True rating of a power supply is the amount of Voltage and Current that is flowing through the device.
If inverter rating is in kVA then the manufacturer is publishing ratings without assuming a power factor so the inverter could be used by rating on loads with potentially widely varying power factors.
This kVA would be best described by the Apparent Power(S).
If Apparent Power (S) is under estimated then it is possible the power supply will be undersized.
kVA to kW calculation
The real power P in kilowatts (kW) is equal to the apparent power S in kilovolt-amps (kVA), times the power factor PF:
P(kW) = S(kVA) × PF
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