Not sure what voltage solar sunroof panel outputs but you will need some kind of DC-DC charger that can take variable voltage from the solar panel and supply constant voltage to the battery. Example here http://www.powerstream.com/pv-control.htm
Having a switch so that you can choose weather you want battery charged or fan running would be a good idea too.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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