Free Capacitor Bank Calculator
Calculate the capacitor bank kVAR needed to improve power factor to a target value.
kW
Required Capacitor Bank
110.6 kVAR
Apparent Power Before266.7 kVA
Apparent Power After210.5 kVA
Required Capacitor Bank vs Real Power (P)
Power Factor Correction with Capacitors
Capacitor banks supply reactive power locally, reducing the reactive current drawn from the supply.
Formula
Q_c = P (tan(phi_1) - tan(phi_2))
where P is real power, phi_1 = arccos(PF_old), phi_2 = arccos(PF_new). Equivalently: tan(phi) = sqrt(1/PF^2 - 1).
Example Calculation
Improve power factor from 0.75 to 0.95 on a 200 kW load.
- 01tan(phi_1) = sqrt(1/0.75^2 - 1) = sqrt(0.778) = 0.882
- 02tan(phi_2) = sqrt(1/0.95^2 - 1) = sqrt(0.108) = 0.329
- 03Q_c = 200 x (0.882 - 0.329) = 200 x 0.553 = 110.6 kVAR
- 04Select 120 kVAR capacitor bank (next standard size).
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