Who are these people who keep their phones outdoors on tables, and not in their pocket? This is impractical and costly, and nobody will make a phone like this. If anyone does, it will be Samsung, since it's a silly gimmicky idea which nobody needs or will use (which is kind of their thing).
No, there won't be a solar car. The only way we could have a solar car is if a) solar cells get extraordinarily efficient, b) crash safety regulations are largely eliminated (could come when we near 100% self-driving cars) AND c) the public completely rethinks what a car is (single occupancy, self driving, drafting, prone seating position, tiny tires, swoopy shape, lower speed/performance, no city use, etc.). Or d) the sun goes nova, thus drastically increasing solar radiation per square foot, because until that happens we have to work with what they have - which just isn't enough to power a large fast metal machine with a bunch of people in it.
And etching vertical surfaces with solar won't do anything, since vertical surfaces don't get sun, horizontal surfaces do.
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While your demand numbers are interesting, you're suggesting a profit margin of 150%. That's not going to happen.
By the way, Goldman's report talked about what they think stationary storage will be worth. Perhaps you will think these are not-optimistic-enough, but here you are:
Dropbox - 213091911-Tsla-Goldman.pdf
They say it's worth $20/share as of when the report was written. It's a good report btw, I think people should read it all the way through if they haven't.
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Well, this will definitely happen, as anyone who's seen the cost curves of solar over the last decades can tell you. And it will happen soon. It's already happened in some places (with lots of sun and above-average electricity costs)