Capacitor Size & Diagnostic Tool

Determine run capacitor values or diagnose active capacitance health

Motor Specs

Motor Power

Motor Line Voltage

Line Frequency

Motor Efficiency80%

Estimated Run Capacitance

44.9 μF

Calculated optimal value for motor start-run coils.

Recommended Min Voltage Rating

440V AC

Safety factor rating handles voltage spikes.

Sizing Formula Details

The motor run capacitor sizing is computed using:

Capacitance (μF) = (Motor Watts * Efficiency) * 1,000,000 / (Voltage² * 2 * π * Frequency)

For split-phase induction motors (such as HVAC fans and small compressors), capacitors are selected to ensure auxiliary windings have correct current phase separation. **Always use the manufacturer rated nameplate capacitance when available.**