International standards rate generators as having a power factor of 0.8. Electrical efficiency is expressed as a power factor between 0 and 1: the closer the power factor is to 1, the more efficiently the kVA is being converted into useful kW. You can convert between kVA and kW if you know the efficiency of the electrical system. However electrical systems are never 100% efficient and therefore not all of the systems apparent power will be used to produce a useful work output. kVA is a measure of apparent power: it tells you the total amount of power in use in a system. Generators are rated in kilo-volt-amperes (kVA). Kilowatts is the actual power that will be used by the load to produce a useful working output. If you add up the maximum required wattage for your equipment, you’ll end up with your total power requirement in kilowatts (kW).
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