We often hear drivers ask, 'How long will it take to charge my EV with a fast charger?' While the answer is usually a matter of minutes, the result depends on a few factors.
The key to getting the most out of fast charging is understanding that it's about more than just the peak power someone tells you a charger can deliver (e.g., 300 kW, 400 kW, etc.). The best results are only possible when the network, charger, and EV work in harmony, as using a fast charger alone will not guarantee that your EV will draw the maximum amount of power.
Charging networks like IONITY are designed to support the fastest real-world charging speeds, and we want to ensure all drivers can charge as fast as possible. In this blog post, we will share what true fast charging is, how it works and some tips for achieving the fastest charging speeds for your EV.
What is ultra-fast EV charging?
Ultra-fast EV charging (also known as High Power Charging and ultra-rapid charging) refers to chargers capable of delivering 150 kW or more, enabling the fastest charging speeds available today.
However, true ultra-fast charging is about more than a headline power rating. The most efficient charging sessions combine high peak power, the ability to sustain that power over time, and minimal slowdown when other drivers plug in.
It’s also important not to confuse ultra-fast charging (sometimes called ultra-rapid charging) with rapid charging, which typically delivers 50-149 kW. While rapid chargers are widely available, many newer EVs can charge significantly faster when connected to an ultra-fast charger delivering 350, 400, or even 600 kW.
That said, the charger itself is only one part of the equation. Read on to learn how your EV, the charging network, and the conditions all work together to help you achieve the fastest possible charging speeds at IONITY Locations and beyond.
1. Know your EV’s charging sweet spot
One of the easiest ways to find your EV’s fast-charging sweet spot is by understanding its charging architecture, which controls how your vehicle manages incoming electricity and determines the power it can accept. In some EVs, especially models with 400V architecture, this can limit charging speeds to below 100 kW, even when using a more powerful charger.
As charging technology has evolved, newer EVs such as the BMW iX3 and Porsche Cayenne Electric have adopted 800V charging architectures, allowing them to accept much higher power from ultra-fast chargers. In the real world, this means they can add over 300 km of range in just 10 minutes when connected to a 400 kW charger.
As this comparison demonstrates, the primary difference between 800V and 400V architecture is the amount of power the EV can accept from the charger.
800V architecture
- Used by many newer EVs
- Designed to handle much higher power levels
- Enables faster charging for longer
- Makes full use of ultra-fast chargers rated at 300 kW and above
400V architecture
- Found in many earlier and entry-level EVs
- Typically peaks at around 100-150 kW
- Still benefits from ultra-fast chargers, but won’t reach their maximum output
You can check your own EV’s charging architecture by visiting EV Database, scrolling to Battery, and looking for the “Architecture” field. To see how much power your EV can accept, scroll to Charging and check “Charge Power (Max)”.
2. Choose a network built to sustain high power
Finding the right charger is key to charging quickly. To achieve the best results, choose a network built to consistently sustain high power, as charging speed depends as much on the quality of the infrastructure as it does on the headline power rating.
The fastest charger is also the one that stays fast when others plug in. That’s because at some charging sites, the available power is shared across multiple stalls, meaning charging speeds can drop significantly as more EVs connect - even if the headline figure on the charger is 300 or 400 kW. True fast charging depends on a network’s ability to deliver high power consistently, not just in perfect conditions, which comes down to infrastructure quality, site design, and strong grid connections.
IONITY is the only charging network with a pure 800V charging infrastructure, built to support both current and future EVs. We enable the fastest real-world charging speeds with 350 kW chargers that can deliver full power when charging multiple EVs, and 400 kW chargers that share power but still deliver up to 200 kW per vehicle when two EVs are charging - more than enough for most modern EVs. In addition, we are testing charging speeds of up to 600 kW.
3. Arrive ready: battery level and preconditioning matter
Preconditioning your EV before you arrive at the charging station is one of the simplest ways to achieve the fastest possible charging speeds, and a key term to understand here is State of Charge (SoC), which is a percentage that represents the charge level of your EV’s battery.
Most EVs charge fastest when they arrive at a charger with a SoC of around 10-20%, making this an ideal starting point for an ultra-fast charging session. Even if your EV can accept the maximum power a charger can deliver, charging speed (kW) will naturally reduce over time to protect the battery as the SoC increases.
Battery temperature also plays an important role. Preheating your battery, or planning your charging stop later in your journey, helps ensure the battery is warm enough to charge efficiently. In colder conditions, this can take longer, but many EVs offer a winter mode or automatically precondition the battery when you select a charging stop in the navigation system.
Ultra-fast charging in the real world
True ultra-fast charging isn’t just about the power a charger can deliver, but the conditions that enable the fastest charging speed your EV can accept. When your car is in its fast-charging sweet spot, the network can sustain high power, and you have a preconditioned battery, fast charging becomes reliable and convenient rather than confusing. That’s why networks like IONITY are designed to remove the bottlenecks that slow charging down, so when your EV is ready, the infrastructure is too - even when multiple drivers are charging at the same time.
IONITY builds and operates Europe’s leading ultra-fast charging network for Electric Vehicles (EVs). With High Power Charging (HPC) of up to 600 kW, IONITY recharges EVs within minutes. Totalling over 800 charging sites across 24 countries, the IONITY network is supplied exclusively from 100% renewable sources.
En savoir plus
Achieving the fastest charging speed for your EV is easy when you know how all the pieces of the charging ecosystem fit together.
Planifiez vos trajets hivernaux en VE en toute simplicité en suivant des conseils pratiques pour optimiser l'efficacité de la recharge et la commodité. De la mise à jour de votre logiciel de VE à la préchauffe de votre voiture en passant par l'optimisation des arrêts de recharge, IONITY garantit des trajets fluides et fiables même par temps froid.