The charge speed is expressed in 'kW'.
You can find different chargers at our stations: 50 kW chargers and 150+ kW chargers (soon we will even upgrade some of these to 350 kW). The charge speed is determined by the vehicle and depends on multiple factors.
Influence of battery % on charge speed
The graph underneath shows an example of a charge curve. It shows the charge speed (vertical axis, expressed in kW) depending on how full the battery is (horizontal axis).
In this example, the charge speed start to slowly drop when the battery is about 70% full. The drop is steeper when the battery reaches 80%, and at 90% the charge speed is already reduced very significantly. The reason is that as the battery gets more full, it has to be charged more slowly. In this example, fast charging above 80 to 90% of the battery is less useful, since charging will get progressively slower.
The charge curve of each vehicle is different and depends on the design choices made by the vehicle manufacturer. In our support articles for each vehicle model, we provide more information on the charge curve for each model.
Influence temperature on charge speed
Another factor that can have a significant influence on charge speed is the temperature of the battery. A battery works optimally if the temperature is not too high and not too low. In practice, this is usually between 20 °C and 30 °C, although some cars function best with a battery around 40 °C.
In winter, a battery can get very cold, for example if the vehicle is parked outside. This can cause charging to be (much) slower. Conversely, a battery can become very warm during a hot summer day, and this can also cause charging to go slower.
The influence of the temperature on the charge speed is different for each vehicle model. Some models are equipped with thermal management for the battery. This way the battery can be cooled or heated depending on the circumstances. However, on a cold day, it can take a while before a battery pack is completely heated up.
Fast charging is also an effective way to heat up your battery.
Will driving for a long time warm up my battery?
Driving itself only has a minimal effect on the battery's temperature, so you will probably not notice the difference in your charge speed.
What can I do to improve my charge speed?
The impact of cooler temperatures on charge speeds can vary per vehicle brand and whether your battery is able to pre-heat before charging. Regardless of the weather, charge speeds are always faster on an emptier battery and will slow down gradually. Besides this, fast charging will (for most EV’s) heat up the battery, which can, in turn, slightly improve the charge speed.