kW refers to the real or usable power output of an inverter. kVA represents the total power capacity it can carry, including power lost in phase difference (reactive power). For example, an inverter rated at 10 kVA with a power factor of 0.8 can only deliver 8 kW of real power.
Because if you only look at kVA, you may think that the inverter can power more devices than it actually can. Meanwhile, if you only look at kW, you may buy an inverter with too small a kVA capacity, and the system will easily overload.
Inverter kVA rating measures the apparent power that an inverter can handle, expressed in kilovolt-amperes (kVA). It indicates the total capacity of electrical power that can be delivered by the inverter, including the power used effectively (apparent power or kW) and the power lost or not used directly (reactive power).
kW = kVA × Power Factor Let’s say you have a 10000W inverter and your system’s power factor is 0.9: kVA = 10000W / 0.9 ≈ 11.1 kVA This means your inverter must be capable of handling approximately 11.1 kVA to deliver 10 kW of real power in that scenario.
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