How to Size a Capacitor for a Compressor (Tips and Buyer's Guide) (2023)

Capacitors are devices (usually found on the exterior of the motor) that work by storing an electric voltage, which is then discharged to meet the demand of the air compressor system. Depending on the type, they can also run in a continuous duty cycle. Capacitors come in an array of variations, but how should you size one for your compressor?

To size a capacitor for a compressor, you must find the Amps and Voltage requirements of your air compressor. This will give you the required Capacitance in Micro Farad (uF). First, check the manual of your compressor to match the necessary size; otherwise, use the (2650 x Amps) / (Volts) = Capacitor size required (in uF) formula.

Capacitors do not run as often as compressors, so they typically last longer than the air compressor itself. They can also fail unexpectedly if you try to start the unit with an improper pairing- hence the importance of selecting the proper size.

In this article, we’ll discuss what an air compressor capacitor is, where it’s located, and how to select the appropriate size for your machine!

What Is an Air Compressor Capacitor?

A capacitor consists of two metal conductors, separated by some sort of insulating material (also known as dielectric). It is responsible for storing energy and releasing it into the system when necessary; it accomplishes this by swapping electrons between two conductive plates. Air compressors use capacitors to startup, build pressure, and pump air.

More simply put: They are the magic electrical jump-starters that get your air compressor going and keep it running over time.

The main purposes of a capacitor in an air compressor system is to:

How to Size a Capacitor for a Compressor (Tips and Buyer's Guide) (1)
  • Circumvent unwanted frequencies in the system.
  • Inhibit the flow of DC, while allowing the flow of AC.
  • Answer the energy signal from any section.
  • Shift phases and delay system actions.
  • Start the motor.
  • Filter ripples in a rectifier circuit.

The larger the capacitor is, the more power it is able to store and discharge over time.

Types of Air Compressor Capacitors

Your air compressor system usually contains 2 types of capacitors- a start capacitor and a run capacitor.

Capacitors also range in sizes from as little as 1 uF to as large as 50+ uF. They should never be wired directly across a line and should instead be used for startup/run purposes only.

While the names “start” and “run” capacitor are fairly self-explanatory, the details below will better explain the role each one plays.

(Video) Finding Run CAPACITOR SIZE on an AC Unit, Ratings Worn Off!

Start Capacitor

A start capacitor is responsible for kickstarting your air compressor.

It works by receiving a signal from the capacitor start relay, which then turns on an electromagnet. When this happens, power flows through this electromagnet and creates a magnetic field, building up until it’s strong enough to pull in the armature.

How to Size a Capacitor for a Compressor (Tips and Buyer's Guide) (2)

The armature is what starts the motor, as it removes pressure from the system by pushing out oil or air from between its two split parts and generating a voltage “boost.”

This process continues until the motor reaches a speed that’s high enough to sustain itself. At this point, the capacitor will continue to maintain a steady RPM level with its continuous flow of power.

Run Capacitor

The run capacitor, which controls the current and voltage to the compressor’s run windings, is a continuous duty component.

It’s more of an energy-saving part, maintaining the motor circuit throughout the entire time your air compressor is in use.

How to Size a Capacitor for a Compressor (Tips and Buyer's Guide) (3)

To help you differentiate between the two- a start capacitor builds energy to jolt your machine on, while a run capacitor provides continuous energy spurts to the motor in order to keep it running. Both are crucial for your air compressor to function properly.

Where Is the Capacitor on Your Air Compressor Located?

The capacitor for your air compressor will most commonly be located near the motor- either on the exterior of your motor housing or beneath its surface.

It’s also possible for them to be at the front of an electric air compressor’s base, depending on your model. Capacitors are usually marked by a yellow or red stripe that runs down one side.

They look a little something like this:

In terms of where you can purchase a new capacitor, they can be found at local hardware stores, in various online retailers, and even on Amazon. Capacitors do not come in a one-size-fits-all, so make sure you calculate the correct size before ordering!

How Is a Capacitor’s Capability Measured?

The ability each capacitor has to store energy is known as “Capacitance.” In other words, it is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential.

(Video) how to test a compressor without relay in english

Capacitance is typically measured in what is called “Farad.” However, it’s easier to consider the measurements of smaller units like Kilo Micro Farad (KMFD), Micro Farad (MFD), Kilo Pico Farad (KPF), or Nano Farad (NF).

For reference purposes, one Micro Farad is equal to 1 millionth of a Farad. Remember these units when we talk about calculating the correct capacitor for your air compressor.

Determining the Correct Capacitor Size for a Compressor

As we discussed ad nauseum, capacitors are responsible for providing energy to power your compressor. So it makes sense that the capacitor size you need will be determined by how much current and voltage your machine requires.

If you run into an issue regarding a failed run or start capacitor within your air compressor system, follow the formula below to help find the best replacement!

How are Capacitor Sizes Expressed?

Capacitors sizes are determined by two factors:

  • Capacitance (measured in Micro Farad, MFD, or uF)
  • Voltage (measured in Volts or VAC)
How to Size a Capacitor for a Compressor (Tips and Buyer's Guide) (4)

Keep in mind that the voltage rating isn’t what your capacitor will produce but rather what it can handle. The voltage rating displayed on the capacitor includes the “not to exceed” rating, which means you can replace a 250 voltage with a 340 voltage, but you cannot replace a 340 voltage with a 250 voltage.

Here is what your capacitor size readings will look like, displayed on the outer surface:

Calculating Capacitor Size

The best practice is to first consult your air compressor’s user manual to see what capacitor size is recommended. If you can’t find that, you can also look at the script on the side of both your run and start capacitors and re-order that specific type.

If, for some reason, that’s illegible, don’t panic. You can use simple calculations to determine the size you need.

Most capacitors are sized in terms of Micro Farad (uF). In order to properly size a capacitor for an air compressor, use the following equation:

Note: 2650 = a full load of Amps

(2650 x Amps) / (Volts) = Capacitor size required (in uF)

(Video) How to Choose a Replacement Capacitor

To get the Amps and Volts:

  1. Measure the total Volts between the HERM and COMMON terminals on the run capacitor.
  2. Measure the Amps on the wire leading from HERM to START on the compressor.

Let’s say, for example, you get 5.0 Amps and 331 Volts. Your calculation would look like this:

(2650 x 5.0 Amps) / (331 Volts) = A 40 uF Capacitor required

The run capacitor should have the exact Micro Farad (uF) that the motor requires, while start capacitors should be +/- 10% of the closest Micro Farad (uF) to the motor requirement.

Air Compressor Capacitor Buyer’s Guide

Based on what we learned above, there are a few recommendations for top-performing capacitors- ready to help your air compressor do its best work.

These are the most highly rated air compressor capacitors on the current market:

The best part is- they’re all under $20 and available on Amazon! The average cost of utilizing a qualified technician to swap out your capacitor is around $150 (including parts and labor).

Genet is among the most popular line of capacitors. This company designs cutting-edge, high-quality comfort and electrical parts; their track record for high-quality, highly-dependable goods makes them the go-to capacitor supplier.

Genet Motor Run Capacitors are the most durable and dependable electric capacitors available. They replace or supersede obsolete GE Industrial capacitors, which were previously regarded as the most reliable on the market.

Dual capacitors (like the Powerwell branded ones) come in a variety of sizes, depending on their capacitance (uF or MFD), such as 40 plus 5 uF, and voltage.

Round cylinder-shaped dual run capacitors are often used for air conditioning to help start up the compressor and the condenser fan motor. A round capacitor can also be used to substitute oval-shaped ones with the same uF and voltage specifications.

How to Replace Air Compressor Capacitors

When a capacitor blows, it’s usually fairly obvious as the air compressor smokes and stops working. In order to change out either your run or start capacitor, you must remove the old one and insert a replacement.

(Video) Does a CAPACITOR Control Electrical Current to the Motor? Installing Wrong Size MFD to Test!

Warning: Handle with care; most capacitors carry a lethal charge.

Follow these steps to replace your air compressor capacitor:

  1. Put safety glasses and gloves on.
  2. Make sure the machine is unplugged and cooled off.
  3. Remove the pressure relief valve, dial, switch, and wiring of each if they are in the way.
  4. Next, remove the motor housing (if the capacitor you’re changing is beneath its surface).
  5. Unwire the old capacitor.
  6. Dispose of the old capacitor in a safety bin, as it could contain harmful chemicals.
  7. Rewire the new capacitor and push it into position (inside the motor housing).
  8. Turn the metal bolt into place using your hands.

Turn your machine on to make sure the capacitor is installed correctly. Check out this video for a more detailed how-to on replacing a motor start capacitor!

What Happens if You Put a Bigger Capacitor on an Air Compressor?

As a good rule of thumb- the size of your new capacitor (meaning the voltage and capacitance measurement) should be the same as the old one you removed.

If it’s slightly bigger- no harm will come of it, but if it’s MUCH bigger, the entire air compressor system could be thrown off. This can lead to the damage of other electrical components or complete combustion.

An air compressor can not operate properly if the compressor does not provide enough energy or provides too much power for the motor.

Every compressor is made slightly differently, so you should consult the owner’s manual before deciding on a different capacitor than the original model.

Final Thoughts

Capacitors are used in a variety of different types of electrical networks where they store energy temporarily. These little (but mighty) parts are necessary in the event that a high voltage power source is needed for a short period of time.

Air compressor capacitors can also be used to boost a current or as a temporary storage device for alternating currents. They come in many different varieties and sizes, depending on how much capacitance you need for your system.

We recommend taking a look at Genteq Capacitors- one of the most popular on the market! The best part is- they’re all under $20 and available on Amazon.

If you need to calculate your machine’s capacitor needs ASAP and can’t find the manual or read the sizing on the old capacitor, use this formula:

(2650 x Amps) / (Volts) = Capacitor size required (in uF)

(Video) Capacitor Value Calculation Formula | How to Calculate Capacitor Value

For any further questions, reach out to a qualified air compressor technician in your area!

FAQs

How do you choose a capacitor for a compressor? ›

Multiply the full load amps by 2,650. Divide this number by the supply voltage. The full load amps and the supply voltage can be found in the owner's manual. The resulting number is the MicroFarad of the capacitor you need.

How do I know what size AC capacitor I need? ›

And right here it says 370 pretty much votes. So if your capacitor. Has 35 plus five that's the one

How do I know which capacitor to use? ›

When deciding on capacitor types there are a handful of factors to consider:
  1. Size - Size both in terms of physical volume and capacitance. ...
  2. Maximum voltage - Each capacitor is rated for a maximum voltage that can be dropped across it. ...
  3. Leakage current - Capacitors aren't perfect.

What happens if you put too big of a capacitor on a compressor? ›

This is why oversizing a capacitor can quickly cause damage to a compressor. By increasing the current on the start winding the compressor start winding will be much more prone to early failure.

How big of a 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.

What happens if you use a higher rated 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.

How do you match a capacitor to a motor? ›

Multiply 0.5 times the square of the voltage. Call this result "x.". Continuing the example, you have 0.5 times 11.5 volts times 11.5 volts, or 66.1 square volts for "x". Divide the start-up energy requirement, in joules, of the motor by "x" to arrive at the capacitor size needed in farads.

Can I replace a capacitor with a higher uF? ›

You can almost always replace a capacitor with one of a higher voltage. This is the limiting factor of a capacitor due to dielectric breakdown voltages that the manufacturer chose.

Can I use a different capacitor on my AC unit? ›

No. Start capacitors and run capacitors have too many differences to be interchangeable. Using a start capacitor in place of a run capacitor would short out your AC system and would likely lead to the fan motor and/or compressor malfunctioning.

How do I choose a capacitor for my power supply? ›

Therefore, you should choose a capacitor with the smallest temperature coefficient if your product will operate over a broad temperature range. Polarization: Filter capacitors for DC circuits have some specified polarization, which states the direction the electric field should point across the capacitor.

Does size of capacitor matter? ›

Generally no, the physical size of an electrolytic capacitor is not a factor as long as the capacitance and voltage ratings are the same. A possible exception is, if it's a switching power supply that uses low ESR capacitors, then the sizes might be different.

Can I use a 10 capacitor in place of a 5? ›

As long as the capacitor has an equal or higher voltage rating than the original equipment, safety should not be an issue.

What happens if you use too small of a capacitor? ›

Too small a capacitor will reduce torque and the motor will try to draw more current to compensate and thus likely overheat and can burn out. Overlarge run capacitors tend to cause excess current draw (and energy usage) and can also burn things up in the motor windings. Use the correct capacitor!

What does 440 or 370 capacitor mean? ›

370 vs 440 VAC capacitors - YouTube

Can I use 450v capacitor instead of 400v? ›

Q: Can you replace a capacitor rated at 400v with one rated at 450 volts? A: Yes you can.

How many watts can a 2 farad capacitor handle? ›

A commercially available 2F capacitor would be a 'supercapacitor' which can have an internal resistance (ESR) of a few milliohms. They only have ratings up to 5 V or so, so one charged to 5V might give 1000A for a very, very short time. This is 5kW.

Can you replace a 4 microfarad capacitor with a 5 microfarad capacitor? ›

Yes, no problem. Just want to make sure the capacitance is basically the same value and the same type of capacitor. Most likely you're dealing with an electrolytic capacitor here.

What does uF mean in capacitors? ›

Paper and electrolytic capacitors are usually expressed in terms of uF (microfarads). Short forms for micro farad include uF, mfd, MFD, MF and UF. Mica capacitors are usually expressed in terms of pF (micromicrofarads) (picofarads). Short forms for micromicrofarads include pF, mmfd, MMFD, MMF, uuF and PF.

Does voltage matter on capacitors? ›

The voltage on a capacitor is not the rating, but rather how much voltage you can expose the capacitor to. For example, if your voltage source is 9 volts, you should choose a capacitor that is at least double the voltage, 18 volts or even 27 volts to be safe.

Can I use a 5 capacitor in place of a 3? ›

As long as the capacitor has an equal or higher voltage rating than the original equipment, safety should not be an issue. With a fan motor application there is a remote chance that performance will be impacted, but it's not a safety issue.

Can I replace a capacitor with same UF but higher voltage? ›

Replacing a capacitor with something that has a higher voltage rating is always safe. The only problem there is that a capacitor rated for a higher voltage is often physically larger, everything else being equal.

How do you calculate the size of a motor 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.

What is the difference between a run capacitor and a start capacitor? ›

The Two Types of Capacitors

Run capacitors are more common. They store the energy that is needed to keep the fan motor going so that the air conditioner continues to cool down your house. In contrast, the start capacitor specifically provides the energy needed to start up your air conditioner.

What does 25 70 21 Mean on a capacitor? ›

The minimum and maximum permissible surrounding temperatures are specified on the capacitor as follows: 25/70/21 = minimum permissible temperature: –25 °C, maximum permissible temperature: +70 °C. 25/85/21 = minimum permissible temperature: –25 °C, maximum permissible temperature: +85 °C.

Can I use 2.5 mFD capacitor instead of 2.25 mFD? ›

Don't use 2.5 mfd in a fan in which original was 2.25 mfd. It will make the fan run faster and decrease the life of the copper winding by creating extra heat everytime. 1.0 out of 5 stars 2.5mfd sent instead of 2.25 mfd. Very dangerous and misleading.

Why a capacitor of higher value is preferable? ›

A higher value of capacitance is only preferable when filtering power supply outputs to reduce hum. Once this point is reached, higher storage values are not preferred. Any other circuit will not function properly or at all and can actually be seriously damaged it higher value capacitors than recommended are installed.

Can I substitute a larger capacitor? ›

Registered. Power supply electrolytic capacitors have a tolerance of up to 100% higher, so yes you can replace another capacitor as long the replacment is equal or higher in uFs and voltage.....

Can you hook up a capacitor wrong? ›

Does it matter which way you connect a capacitor? In theory, no. In practice, however, certain capacitors are polarized and a reverse polarity voltage will probably damage it. Examples are electrolytic and super capacitors.

Does the capacitor start the compressor? ›

When your thermostat tells your air conditioner to cool the house, the capacitor's job is to provide two hundred forty volts to start up the compressor, fan motor, and blower motor. After the capacitor jumpstarts those parts, your A/C can begin cooling outside air and blowing it throughout your home.

How often do AC capacitors go out? ›

In general, you can expect most AC capacitors to last about 20 years. This is a fairly long lifespan, which is why most heating and AC repair companies will take a look at the capacitor last. They expect the capacitor to last for quite some time.

How do you select capacitor voltage? ›

Choose ceramic capacitors with a voltage rating of at least 1.5 times the maximum-input voltage. If tantalum capacitors are selected, they should be chosen with a voltage rating of at least twice the maximum-input voltage.

How are capacitors rated? ›

Capacitor ratings are determined by how close to the actual values they are when compared to the rated nominal capacitance. Letters and colored bands are used to indicate actual tolerance. Common tolerance levels for capacitors sit around 5% - 10%. However, some capacitors made of plastic have been rated as low as ±1%.

Does the shape of an AC capacitor matter? ›

As long as the capacitance, voltage, and frequency of your capacitor is right for your application, the shape of the capacitor does not matter as long as it can fit within the provided mounting space in your motor or air conditioning unit.

Are new capacitors smaller than old ones? ›

The tech said that new caps are physically smaller than old style caps of the same capacitance... He also went on to say that the ones he used in my amp are of even higher capacitance than the old ones... (even though they are only about 2/3 the size of the old ones).

What is the difference between UF and mFD for capacitor? ›

So, the question arises, are mFD and µF one and the same thing? The simple answer is they belong to the same measurement scale, i.e., mFD stands for “milli-Farad,” whereas µF stands for “micro-Farad.” There are mostly old capacitors manufacturing companies that are using mFD instead of µF capacitors.

Can I use a 440v capacitor instead of a 250v? ›

The voltage rating is a maximum, so it should work just fine.

Can I use a 370v capacitor instead of an 440v? ›

Yes. Using a capacitor which can withstand a higher voltage and a higher temperature is ALWAYS safer, no exceptions, as long as all other parameters stay the same. Reducing its voltage rating will make it vulnerable to voltage & inductor induced spikes, reducing its lifetime. This is the same for temperature.

Can you undersize a capacitor? ›

An undersized capacitor won't hurt your air conditioner, but it will shorten the capacitor's life significantly.

How do I test a capacitor with a multimeter? ›

To test the capacitor with a multimeter, set the meter to read in the high ohms range, somewhere above 10k and 1m ohms. Touch the meter leads to the corresponding leads on the capacitor, red to positive and black to negative. The meter should start at zero and then moving slowly toward infinity.

What happens if you put wrong capacitor in AC? ›

A bad capacitor prevents the exterior unit from properly functioning, which hinders the cooling process as a whole. Second, improper voltage delivery to exterior unit components forces the system to work harder as it attempts to perform its job. Additional components often sustain damage due to a faulty capacitor.

How do I choose a replacement capacitor? ›

Choosing New Capacitors. Each capacitor has two values: a voltage rating and capacitance value. Both are important. The general rule for replacing capacitors is to use values that are equal to or higher than the originally-specified values.

Can I use a run capacitor in place of a start capacitor? ›

In unusual circumstances, a run capacitor could be used as a start capacitor, but the values available are much lower than the values usually available for dedicated start capacitors. The capacitance and voltage ratings would have to match the original start capacitor specification.

Can I replace a single capacitor with a dual capacitor? ›

Yes. If you want to replace a capacitor of value with two of values and , then when wired in parallel, they have to meet the requirement that . However, if wired in series, they must meet the requirement that . It's essentially the opposite way around to using two resistors to replace a single one.

Can I replace a 1000uf 10v capacitor with an 1000uf 16v? ›

Yes. As long as it will fit there will be no problem. The capacitance rating (in farads) is the important factor for the device it is for. Capacitors have a dielectric that is rated for the voltage.

Can I use a 250v capacitor instead of 300v? ›

Yes, as long as the capacitance is the same.

Can I replace 550v capacitor with 450v? ›

In general, yes, replacing a capacitor with one of higher voltage rating is fine.

Can I replace a capacitor with a higher UF? ›

You can almost always replace a capacitor with one of a higher voltage. This is the limiting factor of a capacitor due to dielectric breakdown voltages that the manufacturer chose.

How do I know what capacitor to get for my motor? ›

Multiply 0.5 times the square of the voltage. Call this result "x.". Continuing the example, you have 0.5 times 11.5 volts times 11.5 volts, or 66.1 square volts for "x". Divide the start-up energy requirement, in joules, of the motor by "x" to arrive at the capacitor size needed in farads.

What type of capacitor is on your compressor? ›

The run capacitor is one of two types of capacitors that could be found on single-phase compressors. The run capacitor is used to improve the running efficiency of a compressor's motor. The run capacitor is placed in series with the start winding of the compressor and will remain in the circuit as the motor operates.

How do you select a capacitor for a 3 phase motor? ›

Capacitor size Calculator for 3 phase motors – You have to fill Rating of motor and current Power Factor (from meter). Result Capacitor Size will be in KVAR.

Can I use a 7.5 capacitor in place of a 5? ›

Can I use a 7.5 capacitor in place of a 5? Sure you can, but the circuit may not work the same. Whether it will, depends on the circuit.

Can I use 2.5 MFD capacitor instead of 2.25 MFD? ›

Don't use 2.5 mfd in a fan in which original was 2.25 mfd. It will make the fan run faster and decrease the life of the copper winding by creating extra heat everytime. 1.0 out of 5 stars 2.5mfd sent instead of 2.25 mfd. Very dangerous and misleading.

Can I use 450v capacitor instead of 400v? ›

Q: Can you replace a capacitor rated at 400v with one rated at 450 volts? A: Yes you can.

Is there a difference between a start and run capacitor? ›

The Two Types of Capacitors

Run capacitors are more common. They store the energy that is needed to keep the fan motor going so that the air conditioner continues to cool down your house. In contrast, the start capacitor specifically provides the energy needed to start up your air conditioner.

Can I use a run capacitor in place of a start capacitor? ›

In unusual circumstances, a run capacitor could be used as a start capacitor, but the values available are much lower than the values usually available for dedicated start capacitors. The capacitance and voltage ratings would have to match the original start capacitor specification.

What does uF mean in capacitors? ›

Paper and electrolytic capacitors are usually expressed in terms of uF (microfarads). Short forms for micro farad include uF, mfd, MFD, MF and UF. Mica capacitors are usually expressed in terms of pF (micromicrofarads) (picofarads). Short forms for micromicrofarads include pF, mmfd, MMFD, MMF, uuF and PF.

What does 25 70 21 Mean on a capacitor? ›

The minimum and maximum permissible surrounding temperatures are specified on the capacitor as follows: 25/70/21 = minimum permissible temperature: –25 °C, maximum permissible temperature: +70 °C. 25/85/21 = minimum permissible temperature: –25 °C, maximum permissible temperature: +85 °C.

Can a compressor run without a start capacitor? ›

Compressors were never meant to operate without a motor-run capacitor. The problem will occur because the hard-start Kit will briefly replace the failed motor-run capacitor thereby allowing the compressor to restart.

What's the difference between a run capacitor and a dual run capacitor? ›

A single unit run capacitor hooks up to a single motor, and it is more commonly used in smaller HVAC systems, like small air conditioners. A dual run capacitor incorporates two capacitors into a single unit. With a dual run capacitor, you can power two electric motors.

Can I use a 440v capacitor instead of a 250v? ›

The voltage rating is a maximum, so it should work just fine.

Can you run a three-phase motor on single-phase with capacitors? ›

But with any special arrangement, it is not possible to operate a three-phase motor on a single-phase power supply. As we know, the three-phase induction motor is a self-start motor. As the stator winding of the three-phase induction motor generates a rotating magnetic field. This will create a 120˚ phase shift.

Can I replace a single capacitor with a dual capacitor? ›

Yes. If you want to replace a capacitor of value with two of values and , then when wired in parallel, they have to meet the requirement that . However, if wired in series, they must meet the requirement that . It's essentially the opposite way around to using two resistors to replace a single one.

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