BMW-backed solar EV can harvest more energy in a day than it uses for driving
Developed by Clemson University in collaboration with BMW, Deep Orange 17 shows just how far an EV’s energy consumption can be reduced through low mass, careful aerodynamics and solar cells integrated into the bodywork. According to simulations, the 550 kg prototype can cover a 20 km daily commute using solar energy alone and, on average, still harvest enough surplus energy for a further 50 km of driving.
More than 1,700 solar cells keep working while the car is parked
In autumn 2024, BMW posed a question to graduate students in Clemson University’s Deep Orange programme: could an electric car generate more energy over a typical day of urban use than it consumes for driving? Their answer was Deep Orange 17, also known as Luminetta, a two-door electric coupé. BMW’s research and development team worked alongside the Clemson students, with BMW serving as the project’s principal sponsor.
More than 1,700 photovoltaic cells are integrated into the car’s exterior surfaces, allowing it to harvest energy both on the move and while parked. The solar system was developed in collaboration with Germany’s Fraunhofer Institute for Solar Energy Systems ISE. Its design allows the array to continue generating power even when parts of the panels are shaded.
The developers modelled sunlight availability and environmental conditions in Greenville, Frankfurt, Madrid and Mumbai. Assuming 20 km of driving per day, the vehicle generated enough solar energy, averaged across the four locations, to offset the energy consumed on that daily journey and still leave a surplus equivalent to roughly another 50 km of driving.
In other words, the simulation indicates that a day’s solar harvest can replace the energy used over 20 km and still provide the equivalent of around 50 km of additional driving range. Crucially, these figures come from simulations rather than real-world road tests carried out in the four cities.
Frankfurt is an especially interesting inclusion from a European perspective, as it shows that the system was not assessed only in exceptionally sunny climates. Even so, the Frankfurt result cannot simply be extrapolated to northern European conditions: solar irradiation, season and parking conditions all have a major influence on energy yield.
A 550 kg mass changes the energy equation
Solar panels alone would not be enough to achieve figures like these. Deep Orange 17 weighs just 550 kg, meaning it requires dramatically less energy to accelerate and keep moving than a modern two-tonne EV.
Its multi-material chassis combines structural steel, aluminium, carbon-fibre structural members and 3D-printed metal joints. Steel is used primarily to protect and reinforce the passenger cell, while lighter materials help minimise overall mass.
For the body, the team also drew inspiration from the aerodynamic characteristics of the boxfish, whose streamlined shape reduces drag while preserving interior volume. Regenerative braking, intelligent torque distribution and optimised drivetrain controls further improve energy efficiency.
That 550 kg mass is what makes the project particularly compelling. Deep Orange 17 does not rely on a single technological silver bullet to achieve low energy consumption. Its solar cells, low mass, aerodynamics and control systems work together to reduce the amount of electricity the car needs from the grid.
Battery and motor specifications remain under wraps
The material published by BMW and Clemson does not specify the traction battery’s capacity, electric-motor output, torque, maximum charging power or conventional driving range. That makes direct comparisons with production EVs on acceleration or WLTP range of limited value. The project is intended to demonstrate the potential for energy-positive everyday mobility rather than set performance or range records.
This is also where it differs fundamentally from today’s European electric cars. Manufacturers typically rely on large batteries to deliver long range, whereas Deep Orange 17 approaches the problem from the opposite direction: first minimise the vehicle’s energy demand, then generate part of the electricity it needs on board.
This is not a preview of a new BMW
There is no indication that Deep Orange 17 previews a future BMW production model. It is a fully functioning research prototype from Clemson’s Deep Orange programme, developed with the involvement of BMW’s research and development team. Clemson will continue research on the prototype at the Clemson University International Center for Automotive Research (CU-ICAR), and the car is scheduled to appear at CES 2027 in Las Vegas.
The project’s real value therefore lies in the idea behind it. Solar power can be more than a token supplement in an electric car, but its contribution only becomes significant when the vehicle itself is exceptionally energy-efficient. With its remarkably low mass and extensive solar-integrated bodywork, Deep Orange 17 demonstrates that principle in particularly striking fashion.
