Bidirectional charging concept: The electric car as a flexible energy storage unit
The idea is as simple as it is genius: The high-voltage battery of the electric car not only is charged via the wall box at home but can also supply energy back to the house as a decentralized storage medium.
If the customer has a photovoltaic system, the electric car serves as a temporary storage medium for the domestically generated eco-electricity.
When the sun is no longer shining, the vehicle can supply the stored electricity back to the house. Bidirectional charging at home – also known as Vehicle to Home (V2H) – has great potential to reduce the home owner’s electricity costs and increase network stability.
As a further expansion stage in combination with a home storage unit, it is possible to achieve near-complete energy independence and increased security of supply in the event of a blackout.
“Using the battery of electric vehicles to contribute to climate protection while lowering electricity costs at the same time is a vision that we have found fascinating since the very beginning. And we have found an ideal partner in Audi,” explains Ulrich Reiner, project manager at Hager Group.
As the number of registered electric cars increases, the number of mobile energy storage units also rises. This offers great potential, provided that the storage capacity can be used intelligently, Audi noted.
“Electric mobility is bringing the automotive industry and the energy sector closer together. The battery of an Audi e-tron could supply a single-family home with energy for around one week independently. Looking ahead, we want to make this potential accessible and make the electric car part of the energy transition as an energy storage device on four wheels,” says Martin Dehm, technical project manager for bidirectional charging at Audi.