>but Toyota just made a Prius demo You mean in 2019. >or dashboard which they say adds 25miles of range per day. They made a prototype. They didn't say how m

>but Toyota just made a Prius demo You mean in 2019. >or dashboard which they say adds 25miles of range per day. They made a prototype. They didn't say how much extra cost it would add to the car (and how it affects reliability, maintenance and safety). The cost of those panels has to be balanced by the fact that 25 miles is 30-60 min charge from your mains vs a day of charging from solar? They also made a point to state this wasn't for range extension - i.e. when you're driving, that solar panel isn't contributing meaningfully to your range. >Their design doesn’t look practical, but 5kW/day in sunny areas seem to be a reasonable real world goal. You and I have different definition of 'reasonable'. Like I said, there's a cost to putting these panels on the car and the benefit is so effin small (even sunny areas have cloudy days and/or your car is frequently parked in the shade or indoors) that it's much more reasonable just to plug the darn thing into your mains and charge that way.