What Size Breaker Do I Need for a Tesla Charger? Consider This

Installing a Tesla charger involves more than just plugging in a cable—breaker size, wire gauge, and local codes all play a role in keeping your system safe and efficient. If you’re unsure how to navigate these technicalities, you’re not alone. What size breaker do I need for a Tesla charger?

A 60-amp breaker is common for Tesla chargers, but it varies. Check your charger’s power rating, use the formula (watts ÷ volts = amps), and follow code rules. Wire gauge (#6 AWG for 48 amps) and local regulations also matter. Consult an electrician to confirm safety and compliance.

Curious about wire gauge, circuit calculations, or load capacity for your home’s electrical panel? Continue reading to explore easy-to-use tools, tables, and safety tips that demystify breaker sizing for a smoother, safer Tesla charging experience.

Understanding the Importance of Breaker Size

Before we dive into the specifics, let’s grasp the significance of the breaker size itself. Think of a breaker as a guardian angel for your electrical system.

It’s responsible for protecting against overloads and faults that can lead to dangerous situations. Choosing the right breaker switch size ensures your charging experience is safe, efficient, and hassle-free.

Things To Consider When Choosing a Breaker Size for a Tesla Charger

Now, let’s explore the essential factors to consider when determining the appropriate breaker box size for your Tesla charger.

Tesla Charger Specifications

First up, take a look at your Tesla charger’s specifications. Tesla offers different models, each with varying power ratings measured in watts or kilowatts.

The charger’s power rating directly influences the breaker size you’ll need. So, knowing this information is crucial.

Electrical Voltage

Next, let’s talk about electrical voltage. Most residential buildings in the United States operate at a standard voltage of around 240 volts.

The relationship between the charger’s power rating and the electrical voltage is vital when calculating the breaker size. It’s this interplay that helps determine the ampere (amp) rating needed.

Electrical Code and Regulations

Before proceeding further, keep in mind that local electrical codes and regulations may have specific requirements regarding breaker sizes.

To ensure compliance with these regulations, it’s highly recommended to consult with a licensed electrician. They’ll be familiar with the local codes and can guide you accordingly.

It’s also important that you don’t fiddle with electrical boxes if you don’t have any electrical experience! Rather hire a professional who has the correct tools and knowledge.

Calculating the Breaker Size

Now, let’s crunch some numbers to answer your question, “What size breaker do I need for a Tesla charger?”

Calculating the breaker size involves a simple formula:

Breaker size (in amps) = Charger power rating (in watts) / Electrical voltage (in volts)

For example, if your Tesla charger has a power rating of 14.4 kW and the electrical system operates at 240 volts, the calculation would be:

Breaker size = 14,400 W / 240 V = 60 amps

In this scenario, a 60-amp breaker would be suitable for your charger.

What-Size-Breaker-Do-I-Need-for-a-Tesla-Charger

Additional Considerations for Breakers

While the above formula provides a useful starting point, it’s essential to be aware of other factors that might influence the breaker size.

Wire gauge, wire length, and specific electrical code requirements can impact the overall setup. To ensure a safe and accurate recommendation tailored to your specific needs, it’s wise to consult with a qualified electrician. They’ll evaluate your electrical system and provide personalized guidance.

When choosing a breaker needed for a Tesla charger, you can also consider the following factors.

Consider Your Desired Charge Rate

The standard way to measure charge rate is the charge per hour – for example, the standard you should be looking to have is around 40 miles per hour (64 kph). This, of course, will differ depending on the charging method you use for your vehicle.

There are numerous ways to charge a Tesla: at work, at home, or using portable devices on the road.

If we focus specifically on the requirements to charge at home, we’re looking at you getting 44 miles (70.8 km) of travel distance out of around an hour of charging. Wall charging is the fastest speed for home or office charging options and gives you the most range in a set amount of time.

Looking at other options offers varying results – let’s lay them out in table format so you can tell the difference the charge rate makes.

HardwareCharge rate
Wall connector1 hour charge = 44 miles (70.8 km)
Mobile connector + 120V outlet adapter1 hour = 3 miles (4.8 km)
Mobile connector + 240 V outlet adapter1 hour = 30 miles (48.2 km)
Supercharger15 minutes = 200 miles (321.9 km)
Destination charger1 hour = 44 miles (70.8 km)
This is a table that shows the charge rates of different chargers outlining the charge rate of a range of connectors, specifying the miles (kilometers) you can travel for particular charge times.

The charging speeds do vary, depending on the % charged level of your car battery. The longer it gets charged, the slower it charges. Clearly, some charging methods are better than others. One hour charge time to move 3 miles? Nobody has time for that!

Tesla Motors 24' Cable Wall Connector
We know where to find all the really good stuff, so we recommend that you take a look at this Tesla Motors 24′ Wall Connector from Amazon. 

And what will this cost me?” I hear you ask with a clenched jaw. Well, it doesn’t have to break the bank! Watch this Alex Sibila YouTube video about what it costs to charge a Tesla, how you can reduce this cost, and how to factor charge rate into these equations. 

What Electric Service Size Is Needed?

Whoever said size doesn’t matter was lying or did not have a Tesla. 

Electric service size refers to the amount of electrical power that a building or property can handle. It’s like the capacity of the electrical system. We measure service size in terms of amperage (amps), which basically tells us how much electrical current can flow into the place.

For residential properties, service sizes can range from 100 amps to 400 amps. A common size for many homes is around 200 amps. Commercial and industrial buildings may need even larger service sizes because they often use more electrical power.

To figure out the right service size for a building, an electrician considers things like the size of the place, the number of electrical circuits needed, and the types of appliances and equipment that will be used.

A 50 amp service breaker charges at a rate of about 23 miles per hour (37 kph) using a 240-volt outlet. This is about the same as what you’d get with an electric stove. It doesn’t seem like much, but it’s honest work and the standard for Tesla breakers. 

Determining Total Electrical Load to Choose a Circuit Breaker

We live always-on lives, hungry for power – electrical that is, don’t take that out of context. 

Watts, volts, and amps: calculating the relationship between these is the key to determining the breaker you need to charge your Tesla without blowing out your other bulbs. Note that your total electrical load shouldn’t be more than 80% of capacity to avoid a circuit overload. 

Below is a table that you can use to discern which calculation to use to determine capacity:

CalculationExample
Volts x Amps = Watts240 volts x 100 amps = 24,000 watts
Watts/Volts = Amps24,000 watts/240 volts = 100 amps
This table shows calculations to determine power capacity

This table shows how to determine the total electrical load of a household. This way, you can figure out how much voltage would need to be dedicated to charging your shiny toy.

Choosing The Correct Breaker Size

Before deciding on a breaker size, do calculations based on hypothetical total capacities: take the individual breaker capacity and compare it with the total capacity of all other household appliance usage. Once you have determined the appropriate breaker size, you can begin the installation.

Remember, you’re not alone! We have a fantastic invention called an electrician in this modern era, who is trained to help you with this. We don’t recommend you try to become a graduate of Wikipedia Academy and electrocute yourself – consult with professionals!

If you feel confident in your DIY abilities and want to spare the cost of hiring an electrician, you can pick up some extra tips and tricks from this TESBROS instructional YouTube video.

Model-Specific Charging Needs

When selecting a breaker size for your Tesla charger, consider the onboard charger’s specifications and desired charging speed.

The Tesla Model S has evolved significantly since its initial release, and considering the Type 2 charger compatibility is essential for choosing the right breaker size.

The onboard charger is fitted with a 16.5 kW charger, limiting charging to 16.5 kW even at higher-rated chargers. A crucial factor to consider is the conversion process that occurs within the onboard charger, converting AC power to DC power for efficient charging.

Charging TypeCharging SpeedCharging Time
3-pin Plug3-4 miles/hour33-44 hours to full charge
7kW Charger32 miles/hour11-15 hours to full charge
22kW Charger64 miles/hour5-6 hours to full charge
50kW Rapid Charger180 miles/hour60-80 minutes to charge from 20% to 80%

The onboard charger’s maximum power output for a Tesla Model S is 11.5 kW. A recommended circuit breaker size is 60 amps for a Wall Connector installation.

Some Tesla variants offer a high-amperage charger option, providing up to 17.2 kW of power for 52 miles of range per hour. Charging times vary depending on your specific charging setup and the vehicle’s battery level.

Level 2 Charging Considerations

To support faster charging, you’ll need a 240-volt, split-phase circuit, with a dedicated 240-volt double-pole breaker for the charging circuit.

A Level 2 charger provides up to 25 miles of range per hour and charges up to 15 times faster than a trickle charger.

Key Considerations for Electrical Panels

Older homes with 60-amp service may need a panel upgrade to handle a Level 2 charger.

Electrical Panel Capacity Requirements: A 240-volt double-pole breaker is required for the charging circuit. The continuous load shouldn’t exceed 80% of the breaker’s capacity, so an 80-amp charging circuit requires a 100-amp breaker for safety.

The Wall Connector can be installed both indoors and outdoors, mounted to a wall or post, and can share available power when multiple units are installed.

Wiring Size for Safe Installation: Using the wrong wiring size can cause fires and other safety issues. Make sure to use the recommended wiring size for your charger. Always follow the instructions provided by the charger manufacturer and consult GFCI Protection guidelines to ensure safe installation.

Load Calculations for Safe Installation: Consult with a certified electrician to guarantee your panel can handle the charger and to perform load calculations for a safe installation.

A licensed electrician is necessary for high voltage installations to ensure safety and compliance with local codes.

Understanding Electrical Requirements

Tesla Wall Connectors operate at 240 volts and draw between 32 to 60 amps, with most models using 48 amps.

8 AWG THHN wire is commonly used and can handle up to 55 amps. For chargers drawing more than 55 amps, 6 AWG wire may be required.

The Tesla Wall Connector has a 24-foot cable length, which can be useful in determining the optimal placement of the charger.

A 240-volt, split-phase circuit is necessary for a Tesla charger. The charging process can be compared to Level 2 charging, which adds up to 52 miles of range per hour.

The panel must be able to handle the increased current draw. Assess the distance between the breaker panel and the charging location to avoid voltage drop. A 60-amp breaker is typically recommended for Tesla Wall Connectors.

The Determine Wire Size process is essential to ensure safe and efficient charging. Compliance with the National Electrical Code (NEC) is required for a Tesla charger installation. Use the right wire type, conduit, and follow safety protocols to prevent overheating and ensure a safe installation.

Choosing the Right Breaker

A Tesla Wall Connector can provide up to 11.5 kW / 48 amp output, which adapts to most home electrical systems using Power Management features for versatility.

A 60-amp breaker suits most Tesla Wall Connectors. However, if you have a lower electrical capacity, a 50-amp or 40-amp breaker might be more suitable.

Verify the breaker’s compatibility with your electrical panel and choose the correct wire size and type. It’s crucial to perform a Load Calculation to determine if the current electrical panel can handle the additional EV charger load.

For Teslas like the Model S, Model 3, Model Y, and Model X, a standard 11.5 kW charger requires a 48-amp output, which is often paired with a 60-amp breaker.

High-amperage chargers may need a larger breaker and potentially an upgraded electrical panel.

Choose the correct wire size and type, such as 6 AWG THHN for a 60-amp breaker.

Prioritize safety and consider professional installation to avoid electrical hazards and secure a seamless charging experience for your Tesla.

Installing the Breaker and Wire

shut off main power

Installing the Breaker and Wire for Your Tesla Charger

Turn off the main power to the panel and select a 60-amp double-pole breaker suitable for most Tesla Wall Connectors. A high-power charger like the Tesla Supercharger requires a significant electrical upgrade, including a 480V three-phase line, which is a substantial upgrade from the standard 240V single-phase residential line.

Remove a knockout from the panel and snap the breaker into place, ensuring a secure connection to the bus bar.

For local code requirements, verify the need for additional installations like a disconnect switch. To ensure safety and compliance, it is crucial to follow the General Rule for breaker sizing, rating the breaker for at least 125% of the EV charger’s maximum current.

Measure and cut the conduit to size, accounting for bends and fittings. Bend the conduit smoothly within code limits and install it securely to walls or ceilings.

Use fish tape to pull the wire through the conduit. For wire specifications, use 8 AWG THHN wire for runs under 100 feet or upgrade to 6 AWG for longer distances or higher amp draws.

Consider voltage drop and follow NEC guidelines for wire sizes and conduit fill capacities.

Connect the wires securely to the charger’s terminals, ensuring all connections are tight and safe.


Ready for more insights on Tesla charging? Explore our Ultimate Tesla Charging Guide for expert tips, in-depth comparisons, and proven strategies to streamline every aspect of powering up your EV.

Erwin Meyer
Erwin Meyer

A renowned Tesla enthusiast, and successful entrepreneur, enlightens global audiences through his compelling EV narratives. Discover more about his electric journey on his About Me page. Venture to read Erwin's incredible story that's reshaping the future of motoring. Want to spark a conversation with Erwin? Visit his Contact page, and let’s electrify the world together.