ABCDFGHIJKLMNOPQRSTUVWXYZ
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Effective: 1031 rev.2
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Automatic Capacitor Bank Sizing
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SELECTING AN AUTOMATIC CAPACITOR SIZE
Example: How much kVAR is required to correct an entire
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480V system to a 90% power factor when the peak kilowatt
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The following calculator is used to determine the capacitor kVAR
demand month was 620kW at a 65% power factor?
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required to improve PF of a single load or entire power system.
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Actual power factor, peak kilowatt demand, desired PF and
Formula: kVAR = kW x kW FACTOR
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system voltage are required. The best source for this information
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is the monthly utility bill or other local monitoring equipment. A
From the kW FACTOR calculator below , the FACTOR
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calculation of each months data for a 12 month period is
is 0.685
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recommended to determine the maximum kVAR required.
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Therefore: kVAR = 620 x .685 = 425
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Existing P.F (%)
76
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Desired P.F. (%)
95
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Load (kW)
 2000
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Kilowatt Factor0.526
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Required kVAR1053
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