Aptera Motors Corp. (Nasdaq: SEV) recorded more than 4 kilowatt-hours of usable solar energy into its vehicle’s battery pack on each of three test days measured independently by TÜV Rheinland, peaking at 4.75 kWh. The testing ran over three consecutive days in July at Aptera’s final assembly facility in Carlsbad, California, with TÜV Rheinland solar expert Dr. Giorgio Bardizza on site measuring from sunrise to sunset using the organization’s own calibrated instruments. Aptera and TÜV Rheinland have published the complete test report covering methodology, instrumentation, and the full data set, alongside a video documenting the testing.
Highlights
- 4.23 kWh delivered to the battery with the vehicle parked in a fixed position, hatch closed, and left untouched for the full day
- 4.75 kWh recorded with the rear hatch raised and angled toward the sun — achieved on the day with the least available sunlight of the three
- 4.0 kWh was the benchmark measured against, matching Aptera’s stated daily solar target of roughly 40 miles at 100 watt-hours per mile
- Three test days in Southern California in July, each testing a different scenario at Aptera’s request
What Did TÜV Rheinland Actually Measure?
The bar was 4.0 kWh of usable energy delivered to the battery in a single calendar day. Critically, the energy was measured where it entered the battery — after conversion losses — rather than at the panels, which removes the gap between generated and stored energy that often flatters solar figures.
Each of the three days tested a different scenario at Aptera’s request. Solar range figures below are calculated from the measured energy against Aptera’s targeted 100 watt-hours per mile vehicle efficiency, a figure the company has not yet demonstrated in a production vehicle.
| Test scenario | Energy to battery | Estimated solar range |
|---|---|---|
| Parked in fixed position, hatch closed, untouched all day | 4.23 kWh | ~42 miles |
| Repositioned once at solar noon | 4.40 kWh | ~44 miles |
| Rear hatch raised and angled toward the sun through the day | 4.75 kWh | ~47 miles |
Even without any repositioning, the measured energy exceeded the stated daily target. Each additional condition widened the margin. Aptera notes that the results reflect clear July conditions in Southern California, and that actual daily solar contribution will vary with weather, geographic location, parking orientation, and season.
Who Is TÜV Rheinland?
Founded in Germany in 1872, TÜV Rheinland operates from roughly 500 locations in more than 50 countries and has tested and certified solar technology since 1982. Its findings are relied upon across the global solar industry by investors, lenders, and buyers.
“When American innovation turns sunlight into miles, independent testing helps turn that promise into confidence,” said Jonathan Kotrba, Vice President of Products at TÜV Rheinland North America. “TÜV Rheinland is proud to help advance the next generation of solar technology.”
An In-House Solar Stack
The tested system is Aptera’s own work end to end, spanning the compound-curved panel architecture, a proprietary multi-channel solar charge controller with custom firmware, and the vehicle’s power distribution architecture. According to the company, that full-stack ownership is what allowed the system to be optimized and verified as a complete power production unit.
“The most exciting result is the day we simply parked the vehicle in the sun and let it do the work,” said Steve Fambro, Co-Founder and Co-CEO of Aptera. “We built this system because we believed the sun could do this much work, and now an independent lab has measured it. Solar mobility is here.”
What Comes Next
Aptera’s validation program continues, with further independent validation work planned across a range of vehicle performance metrics.
“A technology that can reshape how the world moves has now been independently verified,” said Chris Anthony, Co-Founder and Co-CEO of Aptera. “For drivers in sunny climates, that means everyday driving powered by the sun instead of fuel or the grid. This is the high standard we’re holding ourselves to as we move toward production.”
