[Schroedingersat]

The aptera has 750W of solar panels, so you're pretty close.

It also has about 40% less Cd, half the frontal area, much less powerful motors nd a fraction of the weight. Which is how you get from 8 hours of sunlight to 5.

Real world it's probbably more like 20-30mi

The most likely reason it won't become common is it's legally a motorcycle to get the weight down to something sensible (or has no legal category in some areas) because cars are a regulatory captured nightmare and we're literally not even allowed to have a sane sized vehicle.

The lightyear and sion are much closer to vaporware and their marketing departments are doing the concept a great disservice, but they have over a kW of panels and you could reasonably expect them to be mostly self charging if your commute is short or it's just for errands.