Yea I have the solar Moonroof option on my Audi A6. It just powers an Aux fan to ventilate the inside cabin when the temperature reaches over 90*. There are two sensors, one inside the cabin and one outside.

For you to use it to keep a battery topped up, i dont see as beneficial. Just too much work imho. I think the wiring would be too complex and a nightmare to rig up to the pano roof.

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2011 E70 50i M Sport