6/6     Solar Prius!
        http://www.solarelectricalvehicles.com
        It also has solar modules for Highlander Hybrid, RAV4 EV, Ford Escape
        Hybrid and Dodge Sprinter Hybrid, although those panels don't look as
        cool as the Prius one.  Too bad it doesn't support Camry Hybrid.
        \_ The claim that you get 20 miles from a full day's sun seems really
           fishy.  That sounds more like the maximum distance the battery will
           propel the car, which you could charge from a home solar panel
           array, but not from the tiny set of panels on the roof of the
           car.  In fact I would be surprised that, after taking into account
           the extra weight required for the solar componentry, you would get
           much benefit at all.
           \_ It says the panel outputs 215W.  This is probably the maximum
              output when the sun is directly above.  Say 12 hours of sunshine
              is about the same as 6 hours of sunshine directly above.  Then
              the output of the panel per day is 215 * 6 = 1.29kWh.  Let's say
              it takes 20 minutes to drive 20 miles.  For the claim to be true,
              the power consumption needs to be below 1.29 / (20/60) = 3.87kW,
              or 5.2hp.  So the question becomes: does it take 5.2hp to propel
              a Prius at 60mph?  I don't know the answer.  If someone knows
              how much energy the ICE can generate from one gallon of gasoline,
              one can calculate the required horsepower from the highway MPG
              rating. -- OP
              how much kinetic energy the ICE can generate from one gallon of
              gasoline, one can calculate the required horsepower from the
              highway MPG rating. -- OP
              \_ Your calculations neglect to take into count that the power
                 consumption of driving, especially in a city, is hardly
                 constant.  Maybe for non-traffic highway driving.  However
                 5hp for continuous-speed highway driving is not unreasonable.
                 \_ But for the Prius, city driving uses less energy per mile
                    on avertage than highway driving.  So I was using highway
                    condition in the calculation as the worse case of the two.
                    on average than highway driving.  So I was using highway
                    condition as the worse case of the two. -- OP
        \_ Why don't they also put a panel over the front hood?  That'll
           increase the output by about 50%.  Do solar panels die when heated
           by the engine below?