How to Charge an Electric Car at Home: A Beginner’s Guide for UK Drivers

How to Charge an Electric Car at Home: A Beginner's Guide for UK Drivers

Last updated: 15 September 2026. Spectrum Energy Systems

How home charging works

A home EV charger, usually called a wallbox, is a fixed unit wired to your consumer unit on a dedicated circuit. It supplies alternating current and the car's onboard charger converts it to direct current for the battery, so charging speed is set by what the wallbox delivers and what the car accepts.

Kilowatts (kW) measure how fast electricity flows; kilowatt hours (kWh) measure how much is stored or used. Capacity divided by speed gives a rough time: 60kWh at 7kW is about eight and a half hours from empty, and hardly anyone charges from empty.

Miles per kWh is the electric version of miles per gallon. Most current EVs manage 3 to 4.5 miles per kWh in real driving, so this guide uses 3.5, which makes a 7kW charger worth roughly 26 miles an hour.

The three ways to charge at home

There are three ways to charge at home: a three-pin plug, a 7kW wallbox or a 22kW three-phase unit. For almost every UK house the 7kW wallbox is the answer.

Assumes 3.5 miles per kWh. Sources: Ofgem price cap for 1 October to 31 December 2026, Octopus Intelligent Go, Zapmap Price Index August 2026, government pump prices for 7 September 2026. Illustrative only.

The three-pin plug

Every EV can be charged from an ordinary socket with the lead often called a granny cable. Car makers limit it to 10A or less, about 2.3kW, so a 60kWh battery takes more than a day. Treat it as a fallback rather than a daily routine.

The 7kW wallbox

This is what most UK drivers end up with. It draws about 32A, so it needs its own circuit from the consumer unit. Six hours on a cheap overnight window puts about 42kWh in, roughly 145 miles.

The 22kW three-phase unit

A 22kW charger needs a three-phase supply, and most UK homes are single-phase. Many cars accept only 7kW or 11kW on AC anyway. 22kW belongs at work, which we cover on our workplace EV charge point page.

Tethered or untethered

A tethered wallbox has its cable permanently attached. An untethered wallbox has a socket and you plug in your own cable. Both use Type 2, the standard AC connector on new EVs sold in the UK.

What a home charger installation involves

The consumer unit is where the cost and the paperwork come from. A wallbox is a new circuit: a cable from the board to the parking spot, its own protective device, and on most UK supplies protection against a PEN conductor fault, which BS 7671 Section 722 requires for chargers on PME earthing. Modern chargers usually build that in. A current clamp on the incoming supply lets the charger throttle back when the house is busy, and is how a solar-aware charger sees your surplus.

• ConsentHomeowners need no one's permission. Renters and flat owners need the landlord or freeholder's written agreement, and the government grant for renters and flat owner-occupiers pays 75% of the cost up to £500 per socket until 31 March 2027, through an OZEV-authorised installer. Owners of houses are not eligible.
• The supplyA 7kW charger adds about 32A. Where maximum demand including the charger stays within 60A per phase, the installer fits it and notifies the network operator afterwards (National Grid Electricity Distribution across most of the East Midlands); above that the installer applies first, through the ENA Connect Direct portal.
• Space in the consumer unitSpare ways make it a short job. A full or outdated board means a sub-board or a replacement, which is one reason we never price a charger before the design.

Adding a circuit is notifiable work under Part P of the Building Regulations. An installer registered with a competent person scheme such as NICEIC or NAPIT certifies it and you receive an Electrical Installation Certificate and a compliance certificate; anyone else must notify building control first. Spectrum is NICEIC registered (3182878).

Every private charger sold in Great Britain since 30 June 2022 must be smart under the Electric Vehicles (Smart Charge Points) Regulations 2021: able to connect, schedule and meter what it delivers. It arrives with default charging hours that avoid the weekday peaks of 8am to 11am and 4pm to 10pm, plus a random delay of up to ten minutes before starting, and you can change or override both.

What home charging costs per mile

Per mile is the fair comparison. This section assumes 3.5 miles per kWh, a 60kWh battery and prices live in September 2026; every figure is illustrative.

Ofgem's price cap sets the average unit rate for 1 October to 31 December 2026 at 26.32p per kWh. That is about 7.5p a mile, and a 60kWh battery from empty costs about £15.80. On an EV tariff at around 8p per kWh the same charge is about £4.80, or 2.3p a mile. The Zapmap Price Index puts public rapid and ultra-rapid charging at 77p per kWh in August 2026, about 22p a mile and roughly £46 for 60kWh. A petrol car doing 40 mpg on unleaded at the government's 7 September 2026 average of 164.4p a litre costs about 19p a mile.

EV tariffs and the overnight window

An EV tariff is an electricity tariff with a block of cheap hours each night for people who charge at home. Octopus Intelligent Go, the widely used example, gives six hours between 11.30pm and 5.30am at about 8p per kWh, applies that rate to the whole house during the window, needs a compatible car or charger so the supplier can manage the session, and since 2026 caps the cheap smart charging at six hours a day. Other suppliers run similar windows; check the live tariff pages, as details change often.

Six hours at 7kW is 42kWh, roughly 145 miles. Set the charger's schedule to the window, or let the tariff's app do it, and the car is full by morning without touching the daytime rate.

Pairing a charger with solar and a battery

Solar-prioritised charging, sometimes called solar diversion, means the charger watches the current clamp on your supply and feeds the car only what the house would otherwise export. Most diverting chargers need around 1.4kW of surplus before they start, because 6A is the minimum charging current the EV standard allows. Above that they follow the sun.

Two facts about the East Midlands decide what that delivers. An array here typically generates 900 to 1,050 kWh per kWp a year, so a 5kWp roof gives roughly 4,500 to 5,000 kWh, most of it in summer. And the car has to be on the drive in daylight. A car at home by day can run a good share of its summer miles on sunshine; a car that is out all day will mostly charge overnight, and its surplus is better sent to the home battery or exported.

People often ask whether the home battery charges the car overnight. It does not. A domestic home battery is 10kWh or 16.1kWh on the Fogstar units we fit, and a single-phase hybrid inverter passes 3 to 6kW, so feeding a 60kWh car would empty it within a couple of hours and leave the house on peak-rate electricity all evening. The sensible arrangement runs the other way: car and battery both fill from the grid in the cheap window, and the battery covers the house through the day. An EV tariff does not control the battery; we schedule it in the Solis app to the same hours.

Bi-directional charging is the emerging option. Sigenergy's SigenStor EV DC module is a 12kW or 25kW DC charger with a CCS2 connector that can also send power from the car back into the house (vehicle-to-home) or the grid. It works only with cars whose makers allow it and sits within a Sigenergy system, so we quote it as an alternative to our standard Solis and Fogstar package.

If you are planning solar and a charger together, we size the array and battery to the house, plan the charger's circuit and clamp position at the same survey, check the board has room for both, and handle the network operator paperwork for both as one exercise. The charger is commissioned last, once the inverter is live, so it can be tested against real export. How many panels the car needs is a separate calculation, worked through in our guide on whether solar panels can charge an electric car.

Frequently asked questions

Spectrum Energy Systems has installed more than 1,000 solar and battery systems across the East Midlands since 2011 and fits home EV chargers alongside them with our own crews from Bulwell. MCS NIC200223, NICEIC 3182878, RECC 00080159.

Related reading

• Can solar panels charge an electric car? How many panels an EV needs and whether it pays
• How to charge an electric car at a public charging station