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.
The power factor is a measure of efficiency, ranging from 0 to 1, and it represents the portion of apparent power that is converted into real power. Understanding the difference between KVA and KW helps in correctly interpreting power ratings for various electrical systems. KVA measures the total power, while KW measures the usable power for work.
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).
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