EV Charging Speeds and Times: 3kW, 7kW, 22kW and Rapid

How long it takes to charge an electric car has no single answer, but it has a short one: at home, hours; on the motorway, minutes. Official guidance from the Society of Motor Manufacturers and Traders puts fast chargers, delivering 7 to 22kW, at four to eight hours for a full battery, while rapid and ultra-rapid chargers reach 80% in 20 to 60 minutes¹. A 7kW home charger generally takes a car from 20% to 80% within six to 12 hours². At the top end, ultra-rapid chargers take many newer models from 20% to 80% in 20 to 30 minutes³.

The reason the ranges are so wide is that charging time is set by three things together, not by the charger alone: the power the charge point can deliver, the rate the car itself will accept, and how full and how warm the battery already is. A 22kW unit can charge one car three times faster than a 7kW unit and make no difference at all to another. This page explains each of those limits in turn, with the charging times published for real cars and real charge points in the UK.

Slow, fast, rapid and ultra-rapid: the four speed bands

UK charging is grouped into four bands, and the band matters more than any single number because it tells you what a charge point is for.

Slow charging runs at up to 3.6kW and takes six to twelve hours to charge a car fully⁶. These are the three-pin socket and the oldest public points. Electricity North West, the network operator for the North West of England, notes that a slow charger will normally fully charge a partly charged car in around four hours, but the band is really an overnight or all-day proposition⁸. The SMMT gives slow charging a wider window of 12 to 40 hours or sometimes more for a full charge, reflecting how small and how old some of these points are¹.

Fast charging covers 7kW to 22kW and is the band almost every home charge point sits in. Uswitch puts fast charging at four to six hours⁷; the SMMT says four to eight hours¹; Electricity North West says up to four hours⁸. A fast charge point can reduce charging time by up to 60% compared with a slow one⁹. This is the band designed for longer stays: parked at home, at work or at a destination, where the car sits for hours anyway.

Rapid charging starts at 43 to 50kW and takes 30 minutes to an hour⁶. Ultra-rapid chargepoints, rated at 150kW and over, are the fastest, at 10 minutes to one hour to reach 80%¹⁰. These are the motorway and en-route points, covered in detail further down the page.

How long each battery takes on a 7.4kW home unit

Battery size is the other half of the arithmetic: the same charger takes twice as long on a 100kWh car as on a 50kWh one. Energy Saving Trust publishes charging times at 7.4kW AC, assuming the car starts from 20% charged¹⁰:

The same guidance gives shorter times at 11kW AC: two hours for a 25kWh battery, 5h 15m for 50kWh, 6h 45m for 75kWh and nine hours for 100kWh, again from 20% charged¹⁰. Carwow's figures for a 7kW charger are close: roughly 14 hours for a 100kWh battery and seven hours for a 50kWh battery¹¹.

For a partial charge, which is what most households actually do, a 7kW charger will generally take a car from 20% to 80% within six to 12 hours². Zapmap's general guide gives low-power charging a wider band of six to 18 hours to reach 80%, reflecting the slowest points and the biggest batteries¹². In practice, a car that comes home partly charged and tops up overnight is doing far less work than these full-charge figures suggest, which is why overnight charging fits so easily around daily driving.

The onboard charger limits your AC charging rate

The most common reason a car charges slower than the charge point's rating is the car itself. On AC, whether from a home wallbox or a public fast point, the power is converted inside the car by its onboard charger, and that unit has a fixed maximum rate.

The Nissan LEAF is the clearest example: its maximum AC charging rate is 6.6kW². Plug a LEAF into a 7kW charger and it charges at 6.6kW. Plug it into a 22kW charger and it still charges at 6.6kW. The bigger unit makes no difference at all.

The same cap applies to cars with faster onboard chargers. Zapmap's charging-time guide uses the Kia EV6 Long Range as an example: on a 22kW AC charger it takes around eight hours to go from 20% to 80%, and on an 11kW charger it also takes approximately eight hours, because the vehicle's maximum AC charging rate is the limiting factor, not the charge point³. This is why the choice between a 7kW and a 22kW home charger is really a question about the car, not the unit.

The practical consequence for public charging is that a large share of the UK's network cannot be sped up by the car either. Which? reported in January 2025 that 57% of UK public chargers are between 3 and 8kW, which at best is slightly faster than an at-home charger and at worst would take nearly a full day⁵. A car's onboard charger and the charge point's rating act as two valves in series: the charge flows at the rate of the slower one.

Getting to 80% in 20 to 60 minutes with rapid points

Rapid charging is a different technology, not just a bigger version of home charging. Rapid and ultra-rapid points deliver DC directly to the battery, bypassing the car's onboard AC charger, which is why they can charge at 25kW to 100kW and beyond¹³. The SMMT's figures are that rapid and ultra-rapid chargers can charge EV batteries within 20 to 60 minutes, reaching 80% in that window, and that some can deliver enough charge for 200 miles of driving in just 15 to 30 minutes¹. Its EV facts page gives a typical charge time of 20 to 40 minutes¹⁴.

The independent figures cluster in the same place. Which ? advises allowing around 40 minutes to charge from 20% to 80% at a rapid or ultra-rapid station, such as at a motorway service station⁵. Carwow's rule of thumb is that a 45-minute rapid charge usually gets a car from about 20% to 80%, enough for most journeys, and that 20% to 80% should take between 30 and 90 minutes¹¹. Zapmap notes that depending on the make and model, a car could charge up to 80% in as little as 20 minutes at some of the higher-powered en-route charge points¹⁵, and that ultra-rapid chargers take many newer models from 20% to 80% in 20 to 30 minutes³. Energy Saving Trust puts rapid chargepoints, at 50kW to 149kW, at 15 minutes to one hour to 80%¹⁰.

Two things narrow those ranges on the day. First, the car's own DC maximum: a car rated at 46kW DC will never draw 150kW from a 150kW unit. Second, the charging curve: the rate falls as the battery fills, which is why nearly all these figures are quoted to 80% rather than to full. In some cases, it can take as long to charge from 80% to 100% as it does from 20% to 80%¹².

Overnight home charging and its advantages

Home charging is where the four bands collapse into one habit: plug in when you get home, unplug when you leave. Home chargers are designed to fully charge an electric car in a matter of hours, and most people charge overnight to take advantage of time-of-use EV tariffs⁶.

The evidence says that is exactly what owners do. Energy Systems Catapult's analysis of homes in its Living Lab found that peak charging occurs between midnight and 6am, consistent with behaviour optimising for current time-of-use tariffs¹⁶. The rewards are material. Zapmap notes that charging at home or at work overnight, when electricity is cheap, reduces overall fuel costs by more than 70%¹⁷. Energy Saving Trust adds that charging overnight is also better for the environment, saving on average up to 26% on carbon dioxide emissions per charge¹⁸.

For households without a charge point yet, the fallback is slower. A regular three-pin socket takes 6 to 8 hours to charge a vehicle⁹, and Energy Saving Trust classes low-speed chargepoints, below 3.7kW, as taking 12 to 15 hours for a full charge¹⁰. The SMMT's window for slow charging runs from 12 to 40 hours or sometimes more¹. More on the socket option is on charging an EV from a 3-pin socket.

The cost side is covered in full on EV charging running costs, but the headline figures belong here because they are what makes overnight charging worth planning around. A full charge at home for a car with a 50kWh battery costs approximately £17 on a standard tariff⁴; a 60kWh battery works out at £14.70⁹. With an off-peak tariff, it can cost less than £10 for a full charge⁵. A Nissan Leaf costs just over £15 to fully charge at home, based on an electricity rate of 24.5p per kWh¹³.

Effects of rapid charging on your battery

The honest answer on rapid charging and battery health is that it is a matter of degree, and the guidance is consistent about where the line sits. Energy Saving Trust's battery advice is explicit about the combination that extends battery life: only using rapid charging when you need to, not fully charging the battery, and not letting the battery get too low on charge¹⁹.

That is a habit guideline, not a warning that rapid chargers destroy batteries. Rapid charging exists precisely for those trips: rapid charging points can recharge an EV's battery to 80% capacity in less than half an hour²⁰, a rate no home unit can match.

What the guidance discourages is making rapid charging the routine. A battery that is repeatedly filled fast, filled to 100% and run down very low is working harder than one that sits between moderate charge levels and charges slowly overnight. The distinction matters for a household's charging plan: rapid charging as a weekly substitute for a home charge point costs more per kWh and works the battery harder than the same energy delivered overnight at 7kW. More detail is on EV batteries, charging habits and degradation.

The 20 to 80% rule, and the habits behind it

The single most repeated number in EV charging guidance is 80%, and it is repeated for two separate reasons.

The first is physics. Charging slows significantly after about 80% to protect the battery and prolong its lifespan, so charging up to 80% is generally the efficient choice¹¹. In some cases it can take as long to charge from 80% to 100% as it does from 20% to 80%¹². The last fifth of the battery is the slowest and, on a rapid charger, the most expensive per mile.

The second is battery care. Zapmap's driving tips say it is a good idea to keep a car charged to about 80% to keep the battery in a good state of health²¹. Energy Saving Trust advises only charging to 80%, especially in hot weather, because warmer weather tends to reduce charging times, but if the battery overheats, charging speed could decrease or stop altogether as a safety measure²². NAPIT, the electrical certification body, notes that most vehicle manufacturers recommend only topping up to 80% to preserve battery life²³.

The bottom of the range has a rule too: a good rule of thumb is to avoid letting the battery get to the 20% mark¹³. Between them, these habits define the everyday charging window most guidance converges on: keep the battery roughly between 20% and 80%, charge to 100% only before a long journey, and let the car sit at high charge levels as little as possible.

The caps explained through a Nissan LEAF

The Nissan LEAF is a useful worked example because it is one of the most common electric cars on UK roads and it shows every limit on this page in one car. Nissan sold around 28,000 zero-emission Leaf in the UK between 2010 and 2018, equivalent to around 825MWh of battery storage capacity²⁴.

The LEAF's battery has grown across generations: the first model had a 24kWh battery, a subsequent update raised it to 30kWh, and the Leaf MkII is available with a 40kWh battery, alongside rapid 50kW DC capability²⁴. Its official WLTP range is 168 miles, with a real-world range of 151 miles²⁴.

Against charge points, the caps bite as follows. On AC, the LEAF's maximum charging rate is 6.6kW², so a 7kW home charger delivers a 0% to 100% charge in approximately seven hours³, or 7.5 hours to 100% at 7kW²⁴. For the 40kWh version, a 7kW home charger provides an 80% charge in around six hours²⁵. On DC, the car's maximum is 46kW², so on a 50kW DC charger it takes approximately 43 minutes to charge from 20% to 80%³. Note that charging speed and range depend on the specific variant, as different models have different battery capacities².

For rapid charging, the LEAF uses the CHAdeMO connector, which is tethered to the charging unit²⁴. A few older models, such as the Nissan Leaf, still use CHAdeMO for rapid charging, but CCS has largely replaced it on newer cars¹¹, so LEAF drivers need to check a rapid point has the right connector before relying on it. The full picture is on Nissan LEAF charging times. The LEAF's own product guidance also recommends charging to 80% in order to protect the battery and maximise efficiency²⁴, which matches the general habit above.

Situations where quicker charging makes no difference

The final section is the one that saves households money: the situations in which paying for more power buys nothing.

The clearest case is the 22kW home charger paired with a car that cannot use it. The Kia EV6 Long Range takes around eight hours from 20% to 80% on a 22kW AC charger and approximately the same on an 11kW charger, because the car's maximum AC rate is the ceiling³. Most cars on UK driveways have an 11kW or 7kW onboard AC charger, and many, like the LEAF, are lower still. A three-phase 22kW unit also needs a three-phase electricity supply, which most UK homes do not have.

The second case is the public network's low-power tail. With 57% of UK public chargers between 3 and 8kW⁵, a car that accepts 11kW AC will spend much of its public charging time at 7kW or below regardless. At that speed, a car will take anywhere from six to 18 hours to charge to 80%¹². Typical on-street charge points generally take between six and 12 hours to recharge a car to 80% or above, depending on the EV model, the charger's power rating and the weather²⁶.

The third case is the battery itself. Above 80%, the charge rate falls away sharply¹¹, and the final 20% can take as long as the middle 60%¹². A 150kW ultra-rapid point will not change that, because the slowdown is the car protecting its own battery. The practical rule that falls out of all three cases: match the charger to the car and the dwell time. Hours parked overnight need only 7kW; a 30-minute stop on the motorway needs 50kW and up; and anything in between is usually paying for power the car cannot take.

For the wider picture of fitting charging around a home's energy use, see EV charging at home.