Wireless EV charging hits 90% efficiency in Swiss real-world trials

A Swiss real-world trial led by Empa researchers and supported by the Swiss Federal Office of Energy and local cantons has demonstrated that wireless electric vehicle (EV) charging can achieve up to 90% efficiency, comparable to conventional cable-based systems. The INLADE project tested inductive charging technology under everyday conditions, including adverse weather and slight parking misalignments, confirming its reliability and efficiency. The system uses a ground-embedded transmitter coil to transfer energy wirelessly to a receiver coil in the car, with an in-vehicle display guiding optimal parking and safety checks to prevent charging if obstacles or living beings are detected between coils. Beyond convenience—allowing drivers to charge simply by parking without cables or connectors—the researchers highlight the potential for EVs to become mobile energy storage units. By automatically linking vehicles to the grid whenever parked, this technology could facilitate bidirectional charging and help stabilize power systems, supporting the energy transition. The project included retrofitting existing EVs with receiver coils and ensuring electromagnetic compatibility