Capacitor bank sizing
Estimate required reactive-power correction and ideal capacitance for the connection you select.
Enable JavaScript for live calculations. Read the method and default example below.
Method and assumptions
- Qc = P × (tan acos pf₁ − tan acos pf₂).
- At 50 Hz: Q = 3ωCV² (delta).
Before using the result
- Assumes sinusoidal, lagging loads. No bank, step size, controller, reactor or harmonic-filter model is selected. Investigate harmonics, resonance and changing demand before specifying a bank.
Worked example
Illustrative default inputs. Enter your project values above.
- Active power
- 400 kW
- Current power factor
- 0.75
- Target power factor
- 0.95
- Supply arrangement
- Three phase — balanced
- Supply voltage
- 415 V
- Three-phase capacitor connection
- Delta
- Supply frequency
- 50 Hz
Default results
- Required correction
- 221.3 kVAR
- Ideal capacitance per phase
- 1,363.3 μF
- Corrected line current
- 585.8 A
Choose a reference or send your BOQ
Compare relevant product families, then confirm the exact rating, control supply and duty. Price and availability are confirmed with your enquiry.
Technical references
These references support planning. The exact model documentation and a project-specific engineering review govern the final specification.