How Long Does It Take to Charge an EV on a 3-Pin Plug?

Charging an EV on a 3-pin plug adds around 8 to 10 miles of range per hour, so a full charge from low takes overnight for a small battery and a day or more for a large one. A 3-pin granny charger draws roughly 2.3kW, which is slow but perfectly usable for overnight top-ups and backup charging. The exact time depends on your battery size, how empty it is and your car's efficiency. If you want a suitable unit, see our portable EV chargers, and for higher daily mileage consider a faster home cable too.

At a glance: 3-pin charge times

These are rough guides at around 2.3kW. Actual times vary with car, temperature and how full the battery is.

How do you work out the charge time?

The quick method is to divide the energy you need by the charger's power. A 3-pin unit delivers around 2.3kW, so adding 20kWh takes roughly 20 divided by 2.3, about 9 hours. In range terms, at 8 to 10 miles per hour, replacing 80 miles takes around 8 to 10 hours. Charging is not perfectly linear and slows a little near full, and cold weather reduces efficiency, so treat any figure as an estimate and add a margin rather than assuming an exact finish time.

How long for a full charge?

A full charge on a 3-pin plug depends heavily on battery size. A small battery of around 20 to 30kWh can fill overnight, while a large 60kWh or bigger battery may need a day or more from low. Because of this, most drivers do not run flat to full on a 3-pin plug. Instead they top up the miles they used that day, which is usually a much shorter charge. For a large battery that needs regular full charges, a faster charger is the better fit.

Is a 3-pin plug fast enough for daily use?

For many drivers, yes. If you cover a moderate daily mileage and can leave the car plugged in overnight, a 3-pin plug can replace what you used comfortably. The average UK car covers well under 30 miles a day, which a 3-pin unit can add in a few overnight hours. High-mileage drivers or those with large batteries may find it cannot keep up, in which case a 7.4kW wallbox, which adds around 25 to 30 miles per hour, is the better everyday tool.

What affects how long it takes?

Several things move the real-world time:

• Battery size: bigger batteries take proportionally longer to fill.
• Starting charge: topping up is far quicker than a full charge.
• Temperature: cold weather reduces efficiency and can slow charging.
• Charger output: a 3kW unit is marginally quicker than 2.3kW.

Because charging can slow near full and losses vary, always allow a bit more time than the simple calculation suggests.

When should you choose a faster charger?

Choose a faster charger if you regularly drive more miles than a 3-pin plug can replace overnight, or if you have a large battery you often run low. A 7.4kW wallbox adds around three times the range per hour and usually fills a car overnight with room to spare. A 3-pin plug remains a sensible backup to keep in the boot for travel and occasional use, but as an only solution it can frustrate high-mileage drivers.

Quick tool: see realistic charge times for any car with our free EV charging time calculator (granny plug, 7kW, 22kW and rapid DC).

Frequently asked questions

How many miles per hour does a 3-pin plug add?

A 3-pin plug adds around 8 to 10 miles of range per hour at roughly 2.3kW. The exact figure depends on your car's efficiency and the temperature. This makes it ideal for overnight top-ups and low daily mileage, but slow for replacing a lot of range or filling a large battery from low.

How long to fully charge a 60kWh EV on a 3-pin plug?

Roughly 26 to 29 hours from near empty at around 2.3kW, so more than a full day. In practice, few drivers charge a large battery from flat to full on a 3-pin plug. Most top up the miles used that day, which is a much shorter charge, and use a faster charger when a full charge is needed.

Can I fully charge overnight on a 3-pin plug?

A small battery of around 20 to 30kWh can often fill overnight, but a large battery cannot from low. Overnight typically gives you 8 to 9 hours, enough to add roughly 70 to 90 miles. For most daily driving that is plenty as a top-up, even if a full charge from empty would take longer.

Does cold weather slow 3-pin charging?

Yes, a little. Cold weather reduces battery efficiency and some energy goes to keeping the battery at a working temperature, so charging can be slightly slower and less efficient in winter. Allow a bit more time in cold conditions, and where possible charge while the car is still warm from driving.

Is a 3-pin plug too slow to bother with?

Not at all. It is slow compared with a wallbox, but perfectly useful for overnight top-ups, low-mileage drivers, plug-in hybrids and as a backup. Many drivers rarely need more than it provides day to day. It only becomes a limitation for high mileage or large batteries that need frequent full charges.

Will a 3kW charger be much quicker than 2.3kW?

Only slightly. A 3kW unit adds a little more range per hour than a 2.3kW one, but the difference over a full charge is modest. Choose based on your socket and wiring rather than the small speed gain, and use adjustable current if your wiring is older or you are unsure.

How do I estimate my own charge time?

Divide the energy you need by the charger power. For a 3-pin unit at around 2.3kW, adding 20kWh takes about 9 hours. In range terms, at 8 to 10 miles per hour, replacing 80 miles takes roughly 8 to 10 hours. Add a margin, as charging slows near full and cold weather reduces efficiency.

The bottom line: a 3-pin plug is slow but dependable, adding about 8 to 10 miles per hour and best used for overnight top-ups. For more, read whether you can charge an EV from a normal socket and compare a granny charger versus a wallbox.