Fast chargers, all of which are AC, are typically rated at either 7 kW (32A, single-phase) or 22 kW (32A, three-phase). Charging times vary depending on the vehicle, but a 7 kW charger will recharge a compatible EV with a 30 kWh battery in 3-5 hours, and 1-2 hours for a 22 kW charger.
Charging rates when using a fast charger will depend on the car’s on-board charger, with not all models able to accept 7 kW or more. These models can still be plugged in to the charge point, but will only draw the maximum power accepted by the on-board charger. For example, a Nissan Leaf with standard 3.3 kW on-board charger will only draw a maximum of 3.3 kW, even if the fast charger is 7 kW or 22 kW.
The majority of fast chargers are 7 kW and untethered, though some home and workplace based units have cables attached. The latter units mean only those vehicles that can use that connector will be able to charge on them; in contrast to the more common use of a driver’s own connector cable. Untethered units are therefore more flexible and can be used by any EV with their own cable.