Thin-film solar cells in panoramic glass roofs of Audi models: Audi and Alta Devices, a subsidiary of the Chinese solar-cell specialist, Hanergy, are working together on this development project. With this cooperation, the partners aim to generate solar energy to increase the range of electric vehicles.
Photo courtesy Audi AG.

Audi today announced a plan to increase the range of the company’s electric vehicles by generating onboard solar energy using thin-film solar cells. Audi and its partner, California-based Alta Devices, a subsidiary of the Chinese solar-cell specialist Hanergy, are taking an incremental approach and will first integrate Alta’s efficient, thin, and flexible mobile power technology into panoramic glass roofs. A prototype is expected by the end of this year.

Recognizing that drivers demand maximum range from their electric vehicles, and also responding to ever more stringent fuel economy requirements around the globe, Audi and other vehicle manufacturers are going to great lengths to maximize every opportunity to increase overall efficiency as well as replace liquid fuels with electricity. Consistent with this effort, Audi’s next step after integrating solar into glass panels will be to cover almost the entire roof with solar cells.

By generating onboard and clean renewable power for systems such as air-conditioning and seat heaters, the solar cells will reduce the demand on an all-electric vehicle’s main battery, thereby providing a longer range for driving. But solar cells also can improve fuel efficiency in mild-hybrid vehicles by making the gasoline or diesel engine’s output more fully available for moving the vehicle instead of producing electricity for in-cabin use. Eventually, Audi and Alta envision solar energy directly charging a fully-electric vehicle’s main battery. “That would be a milestone along the way to achieving sustainable, emission-free mobility,” said Bernd Martens, Audi’s Board of Management Member for Procurement.

The partnership with premier automaker Audi is a high-profile opportunity for Alta, holder of multiple world records for energy conversion efficiency. “This partnership with Audi is Alta Devices’ first cooperation with a high-end auto brand. By combining Alta’s continuing breakthroughs in solar technology and Audi’s drive toward a sustainable mobility of the future, we will shape the solar car of the future,” said Alta CEO Ding Jian.

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Audi to Introduce Solar Roofs, Improve Fuel Efficiency and EV Range