You're assuming something like 24 hours a day of having the car parked in full sunlight, which is not realistic (even ignoring that night exists). For it to mak

You're assuming something like 24 hours a day of having the car parked in full sunlight, which is not realistic (even ignoring that night exists). For it to make sense, you'd need the solar arrays on the car to provide a reasonable percentage of the energy needed during driving. If this isn't the case, you're way better off putting the solar panels somewhere other than the car (where they can work much better), and charging the car when it's not driving.