My personal opinion is that solar panels on vehicles don't make any sense, and probably won't _ever_ make sense. There are two concept cars I know of that can

My personal opinion is that solar panels on vehicles don't make any sense, and probably won't _ever_ make sense. There are two concept cars I know of that can actually get enough power from the solar panels on them to be useful. One of them is the Aptera, which is a no-compromise low energy vehicle. It's tear drop shaped and can only hold two people, so it's going to be a bit niche. The second is the Lightyear solar electric vehicle, which is shaped a bit more like a standard car but is going to cost luxury car money for an ultra lightweight (read: no soundproofing) car. And to what advantage? Charge per year doesn't matter, since you're recharging multiple times per year anyway there's no difference between the panels being on the car vs the ground, other than panels on the ground can be directed more optimally and don't add to the weight of the car. Charge per day matters, and taking a 500 mile trip up to maybe 600 miles (on a perfect sunny day) isn't that big an improvement in practical terms.