Installing a Home EV Charger: What You Need to Know
If you own or plan to buy an electric vehicle, a dedicated home charger is usually the most convenient and safe way to charge. It is faster than a standard three-pin plug and designed for the long periods of high load that charging involves. Here is what to consider before you order one.
Why not just use a three-pin plug?
A standard socket can charge a car, but slowly, and it is not designed for hours of continuous high-current use. Older sockets and wiring may overheat. Manufacturers and safety bodies generally recommend a dedicated charge point installed by a qualified electrician.
Power ratings
Most UK homes with a single-phase supply use a charger rated at up to around 7 kW. That can add a substantial amount of range overnight, depending on the car. Higher-power home charging usually needs a three-phase supply, which is less common in homes. A faster charger is not always useful, because the car itself may limit the charging speed, and your home supply must be able to cope with the load.
Smart features
In Great Britain, regulations require most new home charge points to have smart functionality, including the ability to schedule charging and by default avoid charging at peak times. Smart chargers can connect with time-of-use tariffs and, in some cases, solar panels. Check what your chosen charger supports, such as scheduling, app control and solar integration.
Checks before installation
- Parking: where will the car park and where can the charger be mounted? Cable length and location matter.
- Electrical supply: the installer will check that your consumer unit and supply can handle the extra load. Upgrades may be needed.
- Earthing: the type of earthing in your home affects the installation requirements and safety measures.
- Wi-Fi or mobile signal at the charger, if it needs a connection.
- Permissions: if you rent or live in a flat or a leasehold property, you may need permission from your landlord or freeholder.
Choosing an installer
Choose a qualified electrician who is registered with a recognised competent person scheme and has experience with EV charge points. Get several written quotes that include the equipment, the cable run, any consumer unit changes and certification. Ask for a certificate on completion and keep the paperwork.
Cost and support
Installation costs vary with the charger, distance from the consumer unit and any upgrades needed. Grants have been available in the past for some renters and flat residents, and support schemes change, so check GOV.UK for current options. Some employers and local authorities also offer schemes.
Tethered or untethered?
A tethered charger has a cable permanently attached, which is convenient, while an untethered one uses your own cable and can suit households with different vehicles. Consider which fits your habits.
Running costs
Charger running costs depend on your tariff and charging habits. Read how much it costs to charge at home to work out your numbers, and consider an EV or time-of-use tariff to take advantage of cheaper rates.
Safety
Keep cables untangled and undamaged, do not use damaged equipment, and do not use extension leads for charging unless the charger manufacturer says it is safe. Follow the guidance of your vehicle and charger manufacturers.