TL;DR:
- A 7kW home charger adds roughly 25–30 miles per hour of charge for most EVs — enough to top up overnight every night.
- 22kW AC chargers are only useful if your car supports three-phase charging; most EVs cap out at 7.4kW AC regardless.
- Rapid and ultra-rapid DC chargers (50kW–350kW) are for en-route top-ups, not daily use — frequent DC charging can accelerate battery degradation over time.
“How fast will it charge?” is the first question most people ask when they’re buying an EV or choosing a home charger. The answer is less straightforward than a single number suggests, because charging speed depends on three things interacting: the charger’s output, the car’s on-board charger, and the battery’s state of charge.
Here’s a practical breakdown of every speed tier you’ll encounter in the UK.
The Three-Way Constraint
Charging speed is always limited by the weakest link in the chain:
- The charging point’s rated output (what the infrastructure provides)
- The car’s on-board AC charger or DC charge acceptance rate (what the car can accept)
- The battery’s state of charge (charge acceptance drops as the battery fills)
A 22kW charger won’t charge your Nissan Leaf faster than 6.6kW, because that’s the Leaf’s on-board charger limit. A 150kW DC rapid charger won’t push 150kW into a Volkswagen ID.3 that only accepts up to 130kW DC. These ceilings matter when you’re choosing infrastructure.
Slow Charging: 3.7kW (Single-Phase 16A)
Where you find it: Older home installations, some workplace sockets, three-pin plug adaptors.
Real-world speed: Approximately 12–15 miles of range per hour of charging.
A 3.7kW charge on a typical 60–80kWh family EV (Kia EV6, Tesla Model 3) takes 16–22 hours for a full charge from empty. This is fine if you drive fewer than 100 miles a day and plug in every night — you’ll always wake up full. It’s a problem if you return home with 20% charge and need 80% in four hours.
Three-pin plug charging (which provides around 2.3kW) is slower still and should be treated as emergency backup, not a daily habit. The cables supplied with EVs for three-pin charging carry a warning for a reason: sustained high-current draw from a domestic socket creates heat at the plug.
Standard Home Charging: 7kW (Single-Phase 32A)
Where you find it: Dedicated home charge points (Ohme, Hypervolt, Zappi, etc.), workplace chargers, many destination chargers.
Real-world speed: Approximately 25–30 miles of range per hour.
This is the UK home EV charging standard and the right choice for most households. A 7kW charge point fills a 77kWh battery (e.g., BMW iX1, Hyundai Ioniq 6) in approximately 11 hours overnight. Most people drive 20–40 miles on an average day; a 7kW charger tops that up in an hour.
The practical ceiling for single-phase home supply in the UK is 7.4kW (32A at 230V). Some manufacturers market “7.4kW” chargers — the difference from 7kW is negligible for real-world use.
Smart charging: The main reason to invest in a proper 7kW charger rather than just relying on a slow charge socket is smart scheduling. Chargers from Ohme, Zappi, and Hypervolt integrate with smart electricity tariffs (Octopus Intelligent, Agile) to automatically shift charging to the cheapest or greenest periods, typically after midnight. Over a year, this alone can cut home charging costs by 40–60%.
Fast Charging: 22kW (Three-Phase)
Where you find it: Public car parks, some workplaces, hotels with commercial installations.
Real-world speed: Up to 80–100 miles per hour of charge — but only if the car supports it.
22kW requires three-phase AC power, which is standard in commercial settings but rare in UK homes. More importantly, most EVs sold in the UK cannot accept 22kW AC. They cap out at 7.4kW (single-phase) or 11kW (three-phase) on AC.
Cars that can use 22kW AC include: Renault Zoe (older models), some Peugeot e-208/e-2008 configurations, and a small number of commercial/fleet vehicles. The Tesla Model 3 and Model Y top out at 11kW AC. The Volkswagen ID family tops out at 11kW AC. Most Hyundai/Kia EVs: 10.5kW AC.
Unless you’re buying a car specifically because it supports 22kW AC, a 22kW public charger functions as an 11kW or 7.4kW charger for your vehicle.
Rapid DC Charging: 50kW–150kW
Where you find it: Motorway services (Gridserve, BP Pulse, Pod Point), major retail parks, purpose-built charging hubs.
Real-world speed: Approximately 200–500 miles per hour of charge (vehicle-dependent).
50kW is the most common rapid charger tier in the UK, particularly at older installations. At 50kW, a Tesla Model Y (75kWh battery) adds about 250 miles in an hour — more practically, 80% charge from 10% takes around 40–45 minutes.
At 50–10% state of charge, modern EVs accept DC at close to their rated maximum. As the battery approaches 80%, the charge rate tapers — this is intentional protection to prevent cell stress. Most navigation systems account for this taper and plan stops accordingly.
Real-world DC acceptance rates (manufacturer-rated maximums, actual rates vary):
- Tesla Model 3 Long Range: 250kW
- Kia EV6: 240kW
- Hyundai Ioniq 6: 240kW
- VW ID.4: 135kW (2024+), 100kW (older)
- Nissan Ariya: 130kW
- BMW iX: 200kW
- Nissan Leaf: 50kW (most variants)
Ultra-Rapid: 150kW–350kW
Where you find it: Gridserve Electric Forecourts, Shell Recharge premium sites, Tesla Supercharger V3 network, some motorway service hubs.
Real-world speed: 600–1,000+ miles per hour of charge (for compatible vehicles at peak acceptance).
Ultra-rapid sites use CCS connectors (the standard for most non-Tesla EVs) or Tesla’s NACS connector. In practice, the gap between a 150kW and a 350kW charger is only meaningful if your car can accept over 150kW — currently the Kia EV6, Hyundai Ioniq 5/6, Tesla Model 3/Y, Porsche Taycan, and Audi e-tron GT.
At these speeds, a 10–80% charge on a 77kWh battery takes 18–22 minutes in optimal conditions (warm battery, warm ambient temperature).
Does Frequent Rapid Charging Damage the Battery?
The short answer: regular DC fast charging does impose more thermal stress than AC charging, and over hundreds of thousands of charges the effect on long-term degradation is measurable. But for typical usage — AC at home every night, DC for longer journeys — the effect is minor and well within the warranty degradation thresholds.
The scenarios that accelerate degradation: repeatedly charging from very low (under 5%) to very high (above 95%), doing this with DC fast charging daily for years. Most EV owners driving sensibly won’t hit these patterns.
What Speed Do You Actually Need?
Daily commuters (under 40 miles/day): A 7kW home charger on a smart tariff is all you need. Public charging is for emergencies and longer trips.
Higher-mileage users (40–100 miles/day): 7kW home charging still covers you if you plug in every night. Look for a charger with load management if you have other high-draw appliances.
No home charging (flat, rental property): A 22kW or rapid public charger becomes your primary option. Budget for higher per-kWh costs (public charging costs 2–3x home rates) and factor this into your total cost of ownership calculations.
Long-distance regular travellers: Home 7kW for daily top-ups, plus a car with a high DC acceptance rate (100kW+) to keep motorway stops under 25 minutes.
The charging infrastructure in the UK has expanded significantly — reliable rapid charging on major A-roads and motorways is now routine. The main variable is cost, not availability. At current public rapid charging rates (typically 60–85p/kWh), a 50kWh top-up costs £30–42. Smart home charging at off-peak rates runs 6–8p/kWh for the same energy.