Enter demand, measured power factor and tariff to see how many kvar to install, how much current drops and how fast the capacitor bank pays back.
Pre-sizing and estimating tool: results do not replace design, calculations or reports signed by a licensed professional, nor verification against the applicable codes and standards.
Active power stays the same; reactive power from the grid drops, and with it apparent power and current.
Charges under the chosen rule, at the demand and hours entered.
The last hundredths up to 1.00 cost many kvar for little return.
Cash flow of the improvement: investment in year 0 and annual savings escalated at the rate entered, discounted at the MARR.
The report gathers this page's inputs, results, equations, assumptions and references, with fields for project, engineer and revision. In the print dialog, choose Save as PDF.
Multiply active power by the difference of tangents: kvar = kW × (tan φ current − tan φ target). For 800 kW from 0.80 to 0.95, about 337 kvar.
It depends on the tariff. Many U.S. utilities raise billed demand when PF falls below 0.90 or 0.95, or bill demand in kVA. Check the power factor clause in your rate schedule.
Rarely. The last hundredths need many kvar, and at light load the facility can turn leading. The usual target is 0.95 to 0.98 with an automatic bank.
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