How to charge your electric car at home

What is the wallbox grant?

To encourage drivers to switch to EV, the Government is offering financial incentives through its OZEV (Office of Zero Emissions Vehicles) department. If you buy a new EV, then you’ll currently qualify for a grant that pays for 75 percent of the price and installation cost of a wallbox, up to a maximum of £350. Currently you can apply for a grant for each EV you own, although this is limited to just two vehicles.

How to get an electric car charging point installed at home

The most straightforward way is to arrange the installation through the company selling the wallbox. The price of fitting is often included in the purchase price with the wallbox provider having its own approved installers. If you buy the unit on its own then you can choose your own technician, but they will need to have accreditation from the manufacturer of your chosen device.

It’s worth being aware that the fitter will probably need to check your preferred location for fitting and your home’s electrical circuitry before going ahead. And if you want the wallbox fitted a long way from your fuse box or your wiring needs upgrading, then be prepared to pay a bit more for installation.

What is a smart charger and do I need one?

A smart charger is a wallbox that uses wi-fi or Bluetooth to connect with various apps on your smartphone. In doing so it allows you to remotely tailor your car’s charging schedule, giving you the ability to select when charging happens and how much electricity to put into the battery. As a result, you can make sure you’re only charging when electricity is cheapest, or limit the amount of energy in the battery to 80 percent to avoid overheating the cells and improving longevity. Smart chargers cost more to buy than standard units, but bear in mind that the Government's OLEV subsidy only applies to this kind of equipment, meaning that in most circumstances they actually work out cheaper to buy.

What wattage wall charger should I buy?

The current that your charger can supply will be based both on your home wiring and your car’s on board charging adaptor. The lowest available is the 3kW slow charger, which even on something like a Nissan Leaf with a modest 40kWh battery will require 12 hours for a full charge, while larger models such as an Audi e-tron will need more than 24 hours.

Most wallboxes deliver 7kW fast charging, which reduces the time by about half compared to 3kW units. Almost all electric cars will be able to charge at this rate, which is ideal for home use when most charging is done overnight.

There are also 11kW and 22kW options, but these require a three-phase power supply, which is rare in domestic applications but often found in industrial or business premises. You can have your home upgraded, but it’s unlikely that the extra cost would justify the quicker charging times.

Can I plug my electric car into a regular socket?

The majority of electric cars come with a portable slow charger that can be used with a 3-pin plug in a domestic power socket. This charges at around 3kW, making it the slowest form of charging, with some larger EVs requiring more than 24 hours for a full charge. Most manufacturers now recommend that you get a wallbox installed for domestic charging, only using the 3-pin charger as an emergency back-up. It's also worth checking a cable is included as standard, as certain manufacturers don't include one.

How fast can you charge an electric car at home?

In most situations a 7kW fast charging wallbox offers the quickest method of charging at home. With this unit you can expect to full charge something like a MINI Electric in as little as three and a half hours, while a Nissan Leaf 40kWh will take closer to six hours.

For even faster charging you’ll need to upgrade your wiring to a three-phase system (domestic wiring is usually single-phase), which will allow 22kW charging. At this rate a Nissan Leaf with a 40kWh battery can be fully charged in as little as two hours.

How to check if you have a three-phase connection?

The best way to check whether your property has a three-phase electrical supply is to get a qualified electrical engineer to assess your home’s wiring. However, sometimes a quick visual inspection can reveal whether further investigation is necessary. Normally the best way is to locate your fuse box and meter, as this is where the electricity supply enters the house. With a single phase supply there will usually be a single large system fuse alongside the meter and fuse box containing circuit breakers for the various areas and appliances of the house. In three-phase supply there will be three of these larger system fuses, typically each rated at 100amps.

What’s the difference between an untethered or tethered charger?

This simply refers to the type of charging cable attached to the wallbox. A tethered unit features a permanently attached cable with either a Type 1 or Type 2 connector, and is the perfect choice if you have just one EV as it makes for simple charging - simply park-up and plug in.

With untethered units you use the charging cable provided with the car, which plugs into the charger at one end and EV at the other. This is a more flexible solution as it allows you to quickly swap between Type 1 and Type 2 cables if, say, you run two different EV models with different connectors, such as a Nissan Leaf and a Peugeot e-208.