How do you size a capacitor bank for power factor correction?

Capacitor bank sizing requires: measure current power factor and real power, determine target power factor (typically 0.95-0.98), calculate required reactive power: Qc = P(tan(arccos(PF_old)) - tan(arccos(PF_new))). Select capacitor bank rated for system voltage with nearest available kVAR rating. Consider harmonic resonance potential (tune or detune if needed), switching transients, and automatic vs fixed switching for varying loads. Install at load or distribution level for maximum benefit.