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Electric vehicles (EVs) are soaring in popularity as more environmentally conscious consumers seek greener transportation. With an EV in your driveway, you’ll want to install a home charger for faster, more convenient charging. However, many homeowners need to pay more attention to an important step - assessing if your existing electrical switchboard can handle the increased load from an EV charger.

Installing a home EV charger requires a 240-volt outlet wired to a 40-50 amp circuit. This draws significant power, often more than an older switchboard’s original design capacity. From undersized main fuses to dated circuit breakers, inadequate electrical panels can cause risks like blown fuses, tripped breakers, or even fires when adding an EV charger.

Before any EV charger installation, thoroughly evaluating your electrical system’s capacity is critical. More often than not, some switchboard upgrade is required to accommodate EV charging safely. In this article, we’ll cover how to assess your switchboard, when upgrades are needed, costs, and key steps for a smooth installation once your panel is EV-ready. Let’s switch on the path to electrified transportation!

Assessing Your Existing Electrical Capacity

The first step is to thoroughly evaluate your current electrical system capacity to determine if it can handle the addition of an EV charger’s power demands. The switchboard contains various RCD safety switches, circuit breakers, and fuses, reducing electricity overloading and possible fire and electrocution hazards. Start by looking at the main circuit breaker amperage rating - a service panel rated under 100 amps likely can’t support a 40-50 amp EV charger without tripping.

Charging Ev

Meticulously smart meter and calculate your home’s existing electrical loads to quantify spare capacity. An electrician can conduct detailed load calculations to confirm if there is adequate headroom for the steady draw from EV charging.

Older homes with outdated wiring, undersized services, and insufficient spare capacity will require switchboard upgrades to avoid hazardous overloading when adding an EV charger. Carefully examining the existing system is the only way to assess upgrade needs accurately.

When Switchboard Upgrades Are Necessary

For most homes, especially older ones, switchboard upgrades will be required to support EV charging. If you want to install solar power in your home, a lot of solar systems require newer switchboards to run effectively. If your home has an obsolete 60-100 amp main fuse panel, a new 200 amp service is recommended to handle the added load.

Even homes with 100-150 amp breaker panels may need upgrades to accommodate a 40-50 amp EV charger circuit. Full switchboard replacement is necessary when the amperage and number of available slots are insufficient.

For other homes, a more targeted upgrade of just the main breaker to 200 amps and installing a new dedicated circuit for the EV charger is sufficient. When detailed electrical load calculations show existing capacity is tapped out and unable to feed a new high-draw circuit, there’s no safe option besides upgrading the switchboard to meet modern demands. This may seem costly upfront, but it prevents hazardous issues down the road.

Safety Considerations

Commercial Ev Charging Station

Safety should be the top priority when upgrading your electrical service for an EV charger. All work should adhere to local codes and be performed by qualified electricians only. According to expert load calculations, the new service panel and breakers must provide sufficient amperage and circuits for the EV load and existing household needs.

The electrical installations also need to follow proper procedures to avoid hazards like electrocution or arc flashes. Correct wiring gauges that can handle the electrical current must also be used.

Other safety steps include installing surge protectors, and ground fault circuit interrupters and properly fusing all lines according to ampacity ratings. While seemingly complex, following safety best practices and using certified electricians ensures your upgraded switchboard and EV charger installation are compliant and risk-free.

How to Upgrade Your Switchboard for an EV Charger

Upgrading enables a more efficient power distribution, reducing energy wastage and lowering electricity bills. Once you’ve determined that a switchboard upgrade is required to support an EV charger, the next step is to plan out the scope of work. Upgrading a switchboard or meter box involves several key stages:

EV Charging

Load Calculations

A certified electrician should calculate your home’s electrical loads to right-size the new switchboard and components. All existing and planned circuits are factored in.


Building permits are usually required for service panel upgrades. The electrician will know the regulations and obtain proper permits.


The physical switchboard installation process involves shutting off power, removing old panels, installing new enclosures, running wiring, adding circuits, and integrating the main breaker.


Most areas require an inspection by the local building department to verify code compliance before reconnecting more power.

New Breakers

The electrician will install an appropriately sized main breaker and a dedicated 40-50 amp 240V circuit breaker for the EV charger.

Safety Checks

Verify proper grounding, polarity, and operation of all circuits. Install surge protection and GFCI as needed.

With the upgraded service panel correctly installed and safety verified, you’ll have sufficient higher capacity and the right circuit for your electrician to connect the wall-mounted or hardwired EV charger securely.

Installing Your EV Charger After Upgrade

Ev Vehicle Charger

Once your electrical service is upgraded to handle the demands of EV charging, you’re ready for the charger installation. Have a professional electrician install a dedicated 40-50 amp 240-volt circuit for the charger, terminating at a new outlet close to the parking spot.

Hardwired EV chargers are also an option. Carefully follow the manufacturer’s installation guidelines and only use recommended wiring components rated for the charger’s energy needs.

Program any safety features like ground fault protection on the new circuit breaker. With your upgraded service panel and properly installed circuit in place, you can plug in and reliably charge your EV without power issues or hazards.

Be sure to inspect and maintain your new EV charging setup periodically. The right switchboard capacity and charger circuit are key to safe, effective charging at home.

Powering Up for EV

Installing an EV charger at home is an exciting step toward sustainable transportation. But first, your electrical service must be ready to handle the increased load safely.

Upgrading an outdated switchboard should be the necessary initial investment when preparing your home for EV charging. Additional capacity for future upgrades such as solar panels or EV chargers.

By understanding your current electrical capacity, when upgrades are required, associated labour costs, and following essential safety steps, you can upgrade your switchboard appropriately before installing your charger. While it may seem daunting, having a qualified electrician assess your needs and perform the switchboard upgrade is well worth it for peace of mind.

For professional help and guidance on switchboard upgrades or any electrical service needs, contact the experts at Bright Force Electrical. Their master electricians will evaluate your home’s readiness for EV charging and make thoughtful recommendations tailored to your situation. Investing in the right electrical capacity will allow you to enjoy the convenience of home charging safely. Contact Bright Force today to get started!


How can my home’s electrical service handle an EV charger?

Have a licensed electrician inspect your current switchboard, noting the main breaker amp rating and number of available slots. They should also do load calculations to determine spare capacity. A switchboard upgrade is likely required if your system is outdated or undersized.

What amperage do I need for an EV charger circuit?

Most dedicated EV chargers require a 240V circuit with 40-50 amps. This provides sufficient power for faster single-phase level 2 charging. Modern houses with high-powered appliances like air conditioners, large stoves and pool pumps are already reaching the single phase’s capabilities. Single-phase has a low voltage of 230V, which could take a bit longer to charge your vehicle.

Can I install an EV charger without upgrading my 100 amp switchboard?

It’s generally not recommended. A 100-amp service is usually unable to power an additional high-draw circuit safely. Upgrading to a 200 amp panel is ideal for EV charging.

Should I upgrade the whole service or just install a subpanel?

Upgrading the main service panel is preferred to provide sufficient capacity for the EV charger and your entire home’s current and future needs.

What safety issues should I consider?

Use certified electricians, follow codes, size wiring correctly, install safety devices like GFCIs, and ensure adequate overall electrical capacity.

How do I maintain my EV charger after installation?

Periodically inspect the charger, wiring, and circuit breaker. Check for damage, overheating, and other warning signs. Keep connections clean.

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