As an example, lets find the apparent power in kVA of a 2,000-watt circuit with a power factor of 0.8: kVA 2000w ÷ (1,000 x 0. When written out, the formula will look something like this: kVA Watts/1,000 x Power Factor. To convert, simply apply the kVA and power factor to the formula above. To convert watts to kVA you have to divide the watts by 1,000 times the power factor. Thus, the real power P in kilowatts is equal to the apparent power S in kVA times the equipment power factor PF. Use the following formula to convert from kilovolt-amps to kilowatts: Basically, you are looking to convert watts to kilowatts (here is this watts to kWh article). Hit Calculate to receive the current in amps. To convert from kVA to kW, we must account for the power factor. Simply input the phase number, the apparent power in kVA, and the voltage in volts. High reactive power can be undesirable as it requires the electrical system to handle a higher overall power load than is actually used, resulting in inefficiencies, wear, and losses to heat. The remainder of the power is called reactive power, expressed in Kilovolt-amps-reactive (kVAR), and is stored by the inductive and capacitive elements of the load. Power factor is the ratio between apparent power and real power and is a way to represent the amount of power in equipment that’s used to do real work. These often are different because of equipment power factor. kVA is a measure of the apparent power, while kW is a measure of the real power. 1 BTU (British thermal unit) = Watts x 3.Kilovolt-amps (kVA) and kilowatts (kW) are both measures of power, but they differ slightly.Watts = Voltage (root-mean-squared) x Amps (root-mean-squared) x Power Factor (PF) (a three-phase circuit would multiply the voltage by the square root of 3 or approximately 1.732).Some Useful Conversion Factors and Formulas The resulting real power is 450 kilowatts. Most Uninterruptible Power Supply (UPS) units will list the average power factor and real-time load capacity of the UPS, in addition to the KVA.Įxample: You own a 500 KVA UPS unit (apparent power) with a 0.9 power factor. In the case of a 0.5 power factor, real power is approximately half that of the apparent power.ĭeploying systems that have higher power factors result in less electrical loss and can help improve your Power Usage Effectiveness (PUE). In the case of a 1.0 power factor, the real power equals the apparent power. The power factor is a ratio (a number from 0 to 1) of real power and apparent power. The resulting inefficiency of electrical transmission can be measured and expressed as a ratio called the power factor. Differences between real and apparent power, and thus watts and volt amps, arise because of inefficiencies in electrical transmission. However, as waves of current and voltage coincide less, less real power is transferred, even though the circuit is still carrying current. When the voltage and current of a circuit coincide, the real power is equal to the apparent power. Real power is the amount of actual power that can be drawn from a circuit. On the other hand, a watt (W) is a measurement of real power. A term called apparent power (the absolute value of complex power, S) is equal to the product of the volts and amps. Have you ever wondered why some power ratings are expressed in WATTS, some in AMPERES or AMPS, some in VOLTS, and some in KVA? This page will explain in simple terms the difference between the power ratings and describe when each should be used in your data center and network architecture planning.Ī KVA is simply 1,000 volt amps.
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