I think a lot of people here are missing one of the benefits. When you have an EV there are two potential issues with charge. One is actually charging the car

I think a lot of people here are missing one of the benefits. When you have an EV there are two potential issues with charge. One is actually charging the car to get more miles to drive, which a solar panel (of reasonable size/weight) isn't going to contribute enough to. The other issue is not losing charge when parked for long periods of time if not plugged in. If you don't have home or work charging then a 10 mile per day ambient battery drain is going to contribute a lot to how often you need to charge the car. I think having at least some charging would be a nice peace of mind if you are doing something like parking the car in an airport parking lot for a couple of weeks. As a bonus you could use that energy for things like running the fan to keep the cabin from becoming melting hot in direct sun.