On one hand, I see where you are coming from. The vast majority of people overestimate the ability of solar to generate power. It requires a lot of surface area

On one hand, I see where you are coming from. The vast majority of people overestimate the ability of solar to generate power. It requires a lot of surface area with good orientation to generate "meaningful" power, where "meaningful" is enough to power a typical house, a typical car, etc... But it is also possible to attack the problem from the other end. Instead of making more energy, make things more efficient. For example, my e-bike is incredibly efficient. A 100 watt solar panel with good orientation and exposure is likely sufficient to charge my e-bike for my (previous) 14 mile round trip commute (since covid I am WFH though). But that same panel would probably get you 1-2 miles in a Tesla (more likely 0 as you couldn't even push enough power to initiate a charge on the massive batteries). Seems like Aptera is coming at this from the efficiency end. There is an annual collegiate solar car competition and based on previous results you can get a pretty good upper bound of how many miles a "car-like" machine can travel on solar alone[1]. Based on those numbers, it looks like the multi occupant vehicles can get into the 80 miles per day range. This is on a track, going ~30 mph, so definitely not real world conditions. But one doesn't have to stretch their imagination too far to see how adding a few more creature comforts (i.e. vehicle weight, cabin and trunk space) and taking into account real world driving conditions, but also investing more time in aerodynamics and solar panels (the college kids in the solar comp are on a much lower budget) could result in a 40 mile/day estimate. I would probably guess that is on the high side, as Aptera has an incentive to push the numbers in their favor. But I couldn't certainly see how the numbers could be possible. Aptera has a somewhat checkered history, which is another issue entirely. But just from a quick gut check, nothing they are promising seems to be out right impossible. [1] https://www.americansolarchallenge.org/the-competition/2021-american-solar-challenge/formula-sun-grand-prix-2021/ https://www.americansolarchallenge.org/the-competition/2021-...