If we connect inductive or capacitive load (When power factor is not at least unity), The output would differ as there are losses due to low power factor. How to Size a Generator? Portable, Backup & Standby for Home & Commercial Applications.Difference Between Alternator and Generator with Comparison P (w) 1000 x S (kVA) x PF In the formula to convert kVa to watts, the real power is equal to 1000 multiplied by apparent power by the power factor. How many watts are there in 1.2 kilovolt-amps. For example, an electric motor has a power of 45kVA, with a power factor of 0.88, to convert to Watts the power that is in kVA must be multiplied 45kVA by 0.88. So they simply design and rate the electrical device according to its maximum current output that the conductors can safely carry while they consider unity power factor (In case of pure resistive load). kVA to KW Calculator - Calculatorology Web1.2 kVA To Watts calculator quickly converts 1.2 kVA into Watts. As they don’t know exactly what is the power factor and which kind of load (resistive, inductive, capacitive or a mixture of all of them) will be connected to the device and appliances. The main factors manufacturers consider while designing electrical devices and appliances which provide electric power like transformer, UPS, alternators and generators etc, are load and power factor. In very short, a generator generates both active and reactive power which is rated in volt-amperes (VA) instead of watts (W). The formula can also be described as Watts 1000 x Kilovolt-amps x PF or W 1000 x kVA x PF. For this reason apparent power measured in kVA is regarded as the rated power of the alternator. P (W) 1000 x S (kVA) x PF, which means that the real power in watts (W) can be calculated by multiplying 1000 by the apparent power in Kilovolt-amps by the power factor. Keep in mind that the conductors of an alternators are calculated for a definite current and the insulation at the magnetic system are designed for a definite voltage independent of P.F. In other words, generators and alternators don’t deliver Watts but both of active and reactive powers which depends on the power factor of the connected load to it. the power √3 V L I L Cos Φ delivered by the alternator and generator for the same value of current, depends upon P.F. Why is an Alternator or Generator Rated in kVA, Not in kW?Īs we already know that why is a transformer rated in kVA instead of kW, same is the case and reason as well here i.e.
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