Charging time = EV Battery capacity / Output power of the EV charger.

Example

EV battery:50kWh,

Output power of EV charger: 7kWh,

The charging time is 7.14h (50/7).

The AC charging time is determined by the OBC

charging speed of the car.

If the EV supports AC charger of max. 11kWh, while you

use 22kw AC charger to charge it, the charging speed is

still 11kWh.