For a beta, I don’t see this work well, if at all.<p>Firstly, you’d have to park in the sun a lot of the time. That may be doable, but is certainly challenging in many cities, where I would think most cars get parked during daylight hours (and many cars parked at home could just be connected to a larger rooftop solar array that, likely, catches more sunlight per m² than a car parked near to a house)<p>Then, you’d be willing to unfold and fold it whenever you park. “Only a minute” each, I fear, is too long for most drivers especially on relatively short stops such as those people make during lunch time in the USA.<p>Also, this contraption kills the carefully designed streamline of your car. A roof rack impacts performance by at least 5%. I don’t see this being better.<p>The site should, at least, mention range loss due to driving with this.