Depends on the use case. I have a house and garage where I can park and charge my car, and use the car primarily in town, so it makes more sense to put the sola

Depends on the use case. I have a house and garage where I can park and charge my car, and use the car primarily in town, so it makes more sense to put the solar panels on the house (with a battery if needed) than on the car. The car doesn't have to lug them around everywhere (decreasing efficiency), I can use the electricity for multiple purposes, and the panels will likely outlive the car itself. On the other hand, if you live in an apartment and park somewhere that doesn't provide charging, then panels could extend your range such that you only have to use a public charger every couple of weeks rather than a couple of times per week. If you do a lot of long out of town trips, the extra range might out-weight the loss in range from extra weight of the panels. Hard to say. However, in no case are the benefits worth the $250k cost.