I built an expandable solar roof for my Tesla
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This type of solution could be pretty great if you don't drive your car everyday.
Generous of the designer to release it all for free! Directly downloadable from their site:
Cool! I actually did a similar project this year, though not expandable:
That's neat, though why do the two metal rails stick out over the windshield?
Also, dcsm is compelling.. are you located in The Bay by chance?