Capacitor Energy & RC Time Calculator

Most industrial sites are billed for reactive power on top of real consumption. A poor power factor (typically below 0.95) means the supplier is delivering more apparent power than the site uses productively, and the network charges for that inefficiency show up as a reactive demand or excess reactive charge on the bill. Power-factor correction capacitors are the standard fix, and they are sized in joules of stored energy and reactive kVAr, not watts.

For a manufacturing or processing site with significant motor load, harmonic distortion and unbalanced phases push the maths further than fundamental reactive demand alone. A capacitor bank that addresses fundamental reactive demand can do nothing about harmonics, and in the wrong configuration can amplify them and shorten the kit's own life. Reviewing the engineering numbers before specifying or replacing PFC equipment is the difference between a one-off capex with a measurable payback and a recurring drag on the bill that nobody traces back.

Purely Energy's MOP and metering teams monitor power factor as a half-hourly trend across the year, not a one-off survey at commissioning. When the data shows reactive demand creeping up against contracted limits or seasonal patterns drifting, we will flag it before the supplier does, so the corrective work is planned capex rather than a reactive bill conversation in a quarter where margin is already tight. The engineering numbers in this calculator are the starting point for that review.