# What size capacitor do I need for a 2 hp motor?

## What size capacitor do I need for a 2 hp motor?

Small Motor Capacitor “Ballpark” Sizes Based on Motor Horsepower | ||
---|---|---|

Motor Horsepower 2 | Start Capacitor µF / Voltage | Run Capacitor |

1 Hp or 0.75 KW, 120-150 VAC | 500-580 µF | 10-15 µF 370VAC |

2 Hp or 1.5 KW, 200-250VAC | 500-580 µF | 10-15 µF 370VAC |

3 Hp or 2.25 KW, 200-250VAC | 500-580 µF | 20-25 µF 370VAC |

## How do you calculate start capacitor?

Use our capacitance calculation formula. C(µF) = 746 x 80 x 1000 / (220 x 220 x 50) = 24.66 µF. Hence 1 HP Motor required 24.66 µF capacitance to start the motor smoothly. But in the market, you can get 25 µF.

**How do I choose a motor starting capacitor?**

Select a capacitor with a voltage rating at or above the original capacitor. If you’re using a 370 volt capacitor, a 370 or 440 volt one will work. The 440 volt unit will actually last longer. A capacitor will have a marked voltage indicating the accpetable peak voltage, not operational voltage.

### What happens if you put a bigger capacitor on a motor?

Much the same way, a motor will not run properly with a weak capacitor. This is not to imply bigger is better, because a capacitor that is too large can cause energy consumption to rise. In both instances, be it too large or too small, the life of the motor will be shortened due to overheated motor windings.

### Can I use a bigger start capacitor?

A larger than needed run capacitor will not have any real affect. Depending on the cap and motor it could improve efficiency or decease efficiency very slightly. You need to stick with the voltage. Going up slightly capacitance will not be a problem, but down can affect operation.

**What size of capacitor do I need?**

Q: What size capacitor should I get? A: The rule of thumb is to put in 1 Farad of capacitance for every 1,000 watts RMS of total system power. But there is no electronic penalty for using larger value caps, and in fact, many see benefits with 2 or 3 Farads per 1,000 watts RMS.

## Can you replace a start capacitor with a higher UF?

An electric motor start capacitors can be replaced with a micro-farad or UF equal to or up to 20% higher UF than the original capacitor serving the motor.

## Can you replace a motor capacitor with a higher UF?

**Do I need a start or run capacitor?**

Without a start capacitor, your AC will not start up at all, as it is the start capacitor that provides the initial energy needed for start-up. A lot of torque is necessary to start up an AC system, so a start capacitor will have greater capacitance than a run capacitor.