# Single Phase Motor Capacitor Calculator

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921 This is the single phase motor capacitor calculator.

With the help of this calculator you can be able to find –

• Capacitor value in microfarad for starting winding of the single phase motor.
• Capacitor value in microfarad for running winding of the single phase motor.

## Single Phase Motor Capacitor Calculator

How to use the calculator?

For calculating starting capacitor value for single phase motor-

• Select the suitable option of your choice.
• Enter Motor power in watts. If the motor power available is in horsepower, convert it into kW by multiplying it by 746 watts.
• Enter input voltage.
• Enter power factor (cos-phi) value. If you do not know, enter 0.8.
• The calculator would display the result.

For calculating Running capacitor value for single phase motor-

• Select the suitable option of your choice.
• Enter Motor power in watts. If the motor power available is in horsepower, convert it into kW by multiplying it by 746 watts.
• Enter input voltage.
• Enter rated frequency.
• Enter the efficiency of the single phase motor. If you do not know the value, just enter 80 percentage.
• The calculator would display the result.

## How to size capacitor for starting winding of single phase motor?

To size the capacitor for starting winding of the single phase motor, we have the following formula – Where,

I = Current of the motor in amperes

F = rated frequency of the motor

V = rated voltage of the motor

Example
Assume that we have a single phase 1 HP pump having a rated voltage of 230 Volts and a rated frequency of 50 Hertz. The power factor is 0.8 and the efficiency is 80%. The starting capacitor required would be 56.14 Microfarad.

## How to size capacitor for running winding of single phase motor?

To size the capacitor for running winding of the single phase motor, we have the following formula – Where,

η = Efficiency of the motor

F = rated frequency of the motor

V = Rated voltage of the motor

Example
Let us take an example of a ceiling fan. Assume that we have a ceiling fan of 70 Watts having a rated voltage of 230 Volts and a rated frequency is 50 Hertz. The efficiency of the fan is 80 percent. The running capacitor required would be 2.12 Microfarad.