A very long time ago, Elon had stated that Solar on Model S makes no sense. It's cost and weight vs. the energy it generates make it totally not worth it as a primary charging source. Okay, I feel it's time to reconsider that stance. Why? - It is a known fact that Tesla puts a lot of strain on it's 12v battery. Solar will eliminate a big portion of that. - Solar cells are a lot cheaper and better now. - And yes while I agree that Solar on your car as a primary charging source is impractical, it will eliminate vampire drain. Imagine leaving your car at the airport, and not coming back to a dead battery - but instead finding an extra 10 miles. - And it may just get you out of a bind to the next charging spot when you are completely out of options. - Plus, if it can keep your battery and interiors at a certain temp, it will eliminate the initial 1000wh/mi drain when you first start driving your car. Thoughts?