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If solar is cheap, light and robust enough to apply to the roof of an EV - why not? It can help keep the car cool in summer, it can prevent bricking the battery when the car isn't used for a long time. But it won't have a big effect on range.
Yet, any help, however small, is a benefit.
Stella Vie is super light and has a gigantic solar panel. Therefore it can potentially run hundreds of miles a day on solar alone. If your car has 4 times the drag and a quarter of the area at half the PV efficiency, only about 10 added miles remain.
The better batteries get, the less reason to mount PV panels on cars.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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