Solar/plug-in 12V system, alternator optional

[GasSavers_Ryland]

I compleatly lost the information on it, but a few years back I saw a product that replaced your alternator with a perminent magent motor/generator that monitored you battery, to run free when not needed, charge the battery when needed, and had an extra deep cycle battery I belive that it drew from when you needed more power... basicly a bolt on hybrid drive... yes slightly off topic I know.
solar charging your battery so you could remove your alternator is a fine idea, but not one that I would put out to the world at large, to many people have cars that never see sun, pull out of the garage early in the morning, park in a parking ramp, drive back in the evening.