The hardware for wireless charging consists of an inductive charging station (GroundPad), which can be installed both in a garage and outdoors, and a vehicle component (CarPad) mounted on the vehicle underbody. The contactless transmission of energy between the GroundPad and CarPad takes place over a distance of eight centimetres. The GroundPad generates a magnetic field. A current is induced in the CarPad which charges the high-voltage battery. The ground pad is continuously monitored for foreign objects; as soon as such a foreign object is detected, the system switches off the charging process.
The system has a charging capacity of 3.2 kW. This means that the high-voltage batteries in the BMW 530e iPerformance can be fully charged in around three and a half hours. At around 85%, the efficiency of the overall system is already close to the level for charging with cables, where around 92% is currently achieved. When the parking position is reached, the charging process is automatically initiated as soon as the driver has switched off the engine.