EV Charging Speeds Explained: Slow, Fast, Rapid

EV charging speeds fall into three broad tiers: slow charging from a 3-pin plug at around 2.3kW, fast AC charging from a home wallbox or public post at 7.4kW to 22kW, and rapid DC charging at 50kW to 350kW. Slow charging adds roughly 8 to 10 miles of range per hour, fast charging adds around 25 to 30 miles per hour at 7.4kW, and rapid charging is measured in minutes rather than hours. Which tier you can actually reach depends on your car, your cable, and the power supply. To match a cable to your car and speed, start with the cable finder by car.

At a glance: charging speed tiers

What is slow charging?

Slow charging means using a portable 3-pin charger, often called a granny charger, plugged into a standard domestic socket at around 2.3kW. It adds roughly 8 to 10 miles of range per hour, so a full charge can take a day or more on a larger battery. It is a useful backup or for low-mileage drivers, but too slow as an only solution for high-mileage use. Always plug it directly into a wall socket on its own circuit, never through an extension lead or multi-way adapter.

What is fast AC charging?

Fast charging covers AC charging from 7.4kW up to 22kW, the tier most home and public charging sits in. A 7.4kW connection is 32A single phase, the ceiling for a standard UK home, and adds around 25 to 30 miles per hour. Higher speeds of 11kW or 22kW need a three-phase supply and a car that can accept them, which is a minority. This is where your own Type 2 cable does the work, so its rating should suit both your supply and your car.

What is rapid DC charging?

Rapid charging supplies direct current straight to the battery at 50kW to 350kW, bypassing the car onboard charger that limits AC speed. This is why rapid charging is measured in minutes: a suitable car can add a large chunk of range during a coffee stop. Rapid chargers are always tethered, so you never bring your own cable. The trade-off is cost, often much dearer per unit than home charging, and the speed tapers as the battery fills.

Why does the slowest link set my speed?

A charging chain is only as fast as its weakest part: the supply, the cable, and the car onboard charger all have limits, and the lowest one wins. A 22kW cable on a single-phase home still delivers 7.4kW because the supply caps it. A car that accepts only 7.4kW AC will not go faster on a 22kW post. Understanding this saves money, because paying extra for a high-rated cable gives no benefit unless every other link supports it.

How do I pick the right speed for me?

Match the tier to how you drive.

• Low mileage, home parking: a 7.4kW home wallbox with a 5m cable covers most needs overnight.
• No off-street parking: a longer 7m to 10m cable plus public AC posts, with rapid stops for longer trips.
• Occasional backup only: keep a portable 3-pin charger for emergencies.
• Three-phase supply and capable car: a 22kW cable is worth it, otherwise stick with 7.4kW.

Overnight AC charging suits most drivers, with rapid used only on longer journeys.

Frequently asked questions

How many miles does 7.4kW add per hour?

As a rough guide, a 7.4kW connection adds around 25 to 30 miles of range per hour, so most cars charge comfortably overnight. The exact figure depends on the car efficiency and conditions, so treat it as a general benchmark rather than a fixed number. Cold weather and a nearly full battery both slow things down a little.

Is a 22kW cable faster than a 7.4kW one at home?

No. Most UK homes are single phase, which caps charging at 7.4kW no matter the cable rating. A 22kW cable only helps if you have a three-phase supply and a car that accepts higher AC speeds. For a typical home, a 7.4kW cable delivers the same speed for less weight and cost.

Why is rapid charging so much faster?

Rapid chargers supply DC straight to the battery, skipping the car onboard charger that limits AC speed. That lets them run at 50kW to 350kW, adding a large chunk of range in minutes rather than hours. The trade-off is higher cost per unit and a speed that tapers as the battery fills, so rapid charging suits journeys, not daily top-ups.

Can I rely on a 3-pin granny charger alone?

Only if you drive very few miles. At around 2.3kW it adds roughly 8 to 10 miles per hour, so a full charge can take over a day on a big battery. It is an excellent backup, but high-mileage drivers will find it too slow as their only method. A 7.4kW wallbox is a better everyday solution.

Does my car limit the charging speed?

Yes. Every car has an onboard charger that caps AC speed, commonly at 7.4kW or 11kW, with fewer models accepting 22kW. On rapid DC, the car has a separate maximum too. So even with a fast charger and cable, your car may set the ceiling. Check your car specification to know your real limit.

What speed do public chargers offer?

Public AC posts commonly offer 7.4kW to 22kW, while rapid hubs offer 50kW to 350kW. At untethered AC posts you use your own Type 2 cable, while rapid chargers are tethered. The speed you actually get still depends on your car limits and, for AC, whether the site is single or three phase.

To sum up, pick a charging tier that matches your mileage and parking, and remember the slowest link sets your real speed. Use the cable finder by car to get the right cable, or keep a portable charger as backup. For the next steps, read how long it takes to charge an EV and AC vs DC EV charging explained.