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The extra layer of glass is going to cut down on the output, I'm not sure where the 2 watt figure came from because the solar panels that come with VW's as they are shipped from Germany are 5-10 watts depending on the version you can find.
If you want to get the greatest affect then I think charging a 24v battery pack then stepping that down to 13.8v so the alternator sees the battery as fully charged and shuts down.
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