Audi, Hager team for bidirectional charging

July 27, 2020 //By Christoph Hammerschmidt
Audi tests bidirectional charging
The integration of the electric car into the domestic power grid using bidirectional charging is the core of an innovative research project by carmaker Audi and electrical solutions supplier Hager Group. Especially in combination with a photovoltaic system, this could increase grid stability, reduce electricity costs and contribute to climate protection. Surplus PV energy can be stored temporarily and released when needed.

The number of mobile energy storage units is increasing with the rising number of electric car registrations. A great potential - if the storage capacity is made intelligently usable. For this reason, Audi and the Hager Group have jointly developed a solution approach that creates financial incentives and offers increased security of supply: bidirectional charging. "The battery of an Audi e-tron could supply a single-family home with energy for around a week on its own. In the future, we would like to exploit this potential and make the e-car part of the energy turnaround as a power storage device on four wheels," says Martin Dehm, technical project manager for bi-directional charging at Audi.

The electric car's high-voltage battery can be used as a decentralized storage medium to deliver energy to the home. If the customer operates a private photovoltaic system on the roof of his house, the electric car serves as a temporary storage facility for the green electricity he generates himself. If the sun is not shining, the vehicle can then release the stored electricity back to the house. Bidirectional charging at home - also known as Vehicle to Home (V2H) - has great potential to reduce the homeowner's electricity costs and increase grid stability. As a further expansion stage, almost complete energy self-sufficiency and increased supply security in the event of a blackout is possible in combination with a home storage system.

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