A lightweight electric coupe developed by Clemson University students and BMW is testing whether solar power, extreme weight reduction and intelligent controls can make an electric vehicle energy-positive during everyday driving.
Clemson University has unveiled Deep Orange 17, a fully functional electric vehicle prototype designed to generate more energy than it consumes during a typical urban commute.
The two-door coupe, nicknamed Luminetta, was developed by 16 graduate students in Clemson’s Deep Orange automotive engineering program in collaboration with BMW’s research and development team. The project began in fall 2024 after BMW challenged the students to rethink vehicle efficiency and explore whether a car could produce more energy than it uses in ordinary driving.
The prototype combines more than 1,700 photovoltaic cells, an exceptionally lightweight chassis, aerodynamic design, regenerative braking and intelligent drivetrain controls.
Clemson said the vehicle is a research prototype rather than a production-ready electric car. However, the project demonstrates how multiple efficiency technologies could work together to reduce an EV’s reliance on external charging.
One of the central ideas behind Deep Orange 17 is that cars spend most of their time sitting still.
Rather than treating solar power as a supplemental feature, the students incorporated photovoltaic cells throughout the vehicle’s exterior so the car can collect sunlight while parked and while driving.
The more than 1,700 solar cells were developed with Germany’s Fraunhofer Institute for Solar Energy Systems ISE. According to Clemson, the solar system can continue generating electricity even when portions of the panels are shaded.
A protective outer film covers the cells and incorporates a distinctive color produced through a laser manufacturing process.
The students modeled the vehicle under different environmental and solar conditions in four cities: Greenville, South Carolina; Frankfurt, Germany; Madrid, Spain; and Mumbai, India.
Using a hypothetical daily commute of 12 miles, or about 20 kilometers, the researchers found that the vehicle could generate enough surplus solar energy to provide an average of 31 additional miles, or roughly 50 kilometers, of driving range across the four locations.
That figure is an average based on the project’s modeling, rather than a claim that the prototype will add exactly 31 miles of range every day in real-world use.
Solar panels alone would not be enough to make the vehicle energy positive. The Clemson team also focused heavily on reducing the amount of energy required to move the car.
Deep Orange 17 weighs just 1,212 pounds, or 550 kilograms. Clemson says that is approximately one-quarter the weight of many similarly sized production vehicles.
The vehicle uses a multi-material chassis combining structural steel, aluminum, carbon fiber, and 3D-printed metal joints. The combination was designed to maintain structural strength while reducing weight.
The exterior was inspired in part by the boxfish, whose shape offers aerodynamic characteristics that can reduce drag while maintaining interior volume.
Other efficiency technologies include regenerative braking, intelligent torque distribution and optimized drivetrain controls.
Together, those features reduce energy consumption while recovering some energy that would otherwise be lost during braking.
The project represents a different approach from simply installing a small solar panel on an electric vehicle to power accessories.
For Deep Orange 17, solar generation is integrated into the vehicle’s overall energy strategy.
“Rather than serving as an auxiliary feature, solar power is a core part of the vehicle’s propulsion strategy,” the Clemson project team said in a news release.
BMW challenged the students to determine whether the vehicle could become energy-positive based on how people actually use cars rather than relying exclusively on standardized driving cycles.
That distinction is important because a vehicle that spends hours outdoors between trips has significant opportunities to collect solar energy while it is not being driven.
“This is a project we’ve wanted to pursue for years,” said Stephan Augustin, project manager of research and new technologies at BMW. “It’s incredibly rewarding to see this group of students come together over the last two years, overcome so many technical challenges and constraints, and bring an energy-positive vehicle to life.”
The project was not intended to be a purely functional efficiency exercise.
BMW also challenged the students to demonstrate that reducing energy consumption did not require abandoning an appealing vehicle design.
The result is a two-door coupe influenced by BMW’s design heritage while incorporating a modern interpretation.
Inside, the prototype features a custom human-machine interface that provides real-time vehicle telemetry. It also includes Apple CarPlay and Android Auto.
Clemson has not disclosed conventional performance specifications such as horsepower or torque. Instead, the project focuses on energy consumption, solar generation and efficiency.
Deep Orange 17 is also an educational experiment.
Clemson’s Deep Orange program gives graduate automotive engineering students experience with the complete vehicle development process. Students conduct market research, establish customer requirements, develop concepts, engineer vehicle systems, manufacture components and validate the finished prototype.
They also work within real-world budgets, schedules and technical limitations while collaborating with industry engineers.
“It’s rare for a master’s student to have the opportunity to experience the complete process of developing a prototype vehicle,” said Anshul Karn, Deep Orange project manager.
The 16 students who developed Deep Orange 17 graduated with Master of Science degrees in Automotive Engineering on August 7.
Deep Orange Program Director Dr. Greg Mocko said the experience gives students an opportunity to understand how much they have developed as engineers and as a team during the project.
Deep Orange 17 does not demonstrate that conventional electric vehicles can simply be covered with solar cells and generate more energy than they consume.
Its energy-positive performance depends on several unusual characteristics working together, including its extremely low weight, integrated solar collection, aerodynamic design and energy-efficient drivetrain systems.
The prototype nevertheless provides Clemson and its research partners with a platform for studying how those technologies can be integrated into a single vehicle.
The research is expected to continue at the Clemson University International Center for Automotive Research in Greenville, South Carolina, where Deep Orange 17 will be used for additional work on sustainable mobility.
The vehicle is also scheduled to be displayed at the 2027 Consumer Electronics Show in Las Vegas.
The experiment ultimately raises a broader question about electric transportation: Could future vehicles rely less on charging infrastructure by producing some of their own electricity?
For today’s mass-market EVs, the answer remains limited by factors such as available surface area for solar cells, weather, sunlight intensity, vehicle efficiency, battery capacity and manufacturing costs.
Deep Orange 17 takes those constraints to an extreme by combining a lightweight structure with solar generation and efficiency-focused controls.
The result is less a blueprint for an immediate production vehicle than a demonstration of what might be possible when engineers design an automobile around energy generation and consumption from the beginning.
As research continues, Clemson’s Luminetta will offer students and industry partners an opportunity to explore whether that approach can become a practical part of the next generation of electric mobility.
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