Home EV charging explained: wallbox, costs, and installation

Why home charging changes everything

The single biggest variable in your EV running cost is where you charge. Home charging overnight typically costs between one third and one half of what public fast chargers charge per kWh. For most drivers, the ability to charge at home is what makes an EV genuinely cheaper to run than petrol.

Three-pin vs dedicated wallbox

You can charge an EV from a standard three-pin household socket, but it is slow — typically adding 8 to 15 km of range per hour depending on the car. A dedicated 7 kW wallbox charger adds around 35 to 50 km per hour, meaning most cars can top up overnight from nearly empty. For regular home charging, a wallbox is the right choice.

• Standard three-pin: ~2.3 kW, 8–15 km/hr of range — suitable for top-ups only
• 7 kW single-phase wallbox: 35–50 km/hr — fits most home electrical supplies
• 22 kW three-phase wallbox: 80–120 km/hr — requires a three-phase supply (uncommon in residential properties)

Wallbox installation cost

A 7 kW wallbox unit typically costs $300 to $700. Professional installation adds $400 to $1,200 depending on the distance from your consumer unit, whether the cable run is simple or complex, and your electrician's rates. Total installed cost is usually $700 to $1,800. Some governments subsidise home charger installation — check what is available in your country before getting quotes.

Off-peak electricity tariffs

Many energy providers offer time-of-use tariffs where power is cheaper overnight, often between 11 pm and 7 am. Overnight rates can be 30 to 50 percent cheaper than daytime peak rates. Setting your car or wallbox to charge on a schedule during these hours is one of the most effective ways to reduce your EV running costs.

Solar and home charging

If your home has solar panels, charging your EV during daylight hours when your panels are generating excess power can reduce your effective charging cost to near zero. Smart chargers can be configured to prioritise solar export for EV charging, maximising self-consumption and minimising grid draw.