Typical EV uses about 1/3KWhr per mile.. So 8KWhr for "a full day in the sunshine" is about 24 miles or 0.6 gallon of gasoline. That's OK -- but its no freaking solution.. Particularly if you cant park in direct sunshine for 6 or 8 hours a day.. Even ANGLE of incidence and partial shade will destroy that advantage.
Cute -- but I don't think it does anything to overcome the issues of range or cost. Particularly for URBAN driving..
Yeah, makes me wonder how it would do in Portland, Seattle, or other places with heavy cloud covers.