Convert between real power (kW) and apparent power (kVA) using the power factor, with the equivalent current at 400 V and 230 V.
Tell us what you need to power and we will confirm the exact model, voltage and configuration — usually within 24 hours.
Real power (kW) is the energy that actually does work. Apparent power (kVA) is what the alternator and cabling must be able to carry. The gap between them is reactive power, and the ratio of the two is the power factor.
Formula: kVA = kW ÷ power factor, and kW = kVA × power factor. A 10 kW load at a power factor of 0.8 therefore needs 12.5 kVA of generating capacity.
Because the alternator has to carry both real and reactive current, and its windings and insulation are limited by total current. Rating in kVA describes what the machine can physically deliver regardless of the load’s power factor.
For general mixed loads, yes — it is the standard assumption and it is what our sizing calculator uses. For a load that is mostly motors or mostly heating, use the actual figure for a more accurate answer.
