My thoughts on the solar roof announcement:
1) The stock will not surge upwards after this announcement. It just won't. I dread the 500 posts that will speculate on that front. These product announcements simply never move the stock.
2) I am puzzled by this talk of a "solar roof". Elon explained it wasn't something you put on a roof, but the roof itself. Fine... but the thing is there is no such product as a non-solar "roof" now. He isn't adding solar to some existing product, therefore improving its value proposition. He is inventing "roof" as a product. Color me skeptical but there is a reason for that. No two custom built house are the same so roofs are built custom per house. Inefficient and expensive yes, but that is a construction reality. So, let's say he is making a sort of sandwhich material product like SIP's, with solar on top, insulation, and sheathing on the bottom. Ok, but one wouldn't make the whole roof with a solar surface, there will always be places with tree shading or something. So presumably this product includes an option for some dummy surface, metal say. So the whole thing reduces to avoiding the cost of some metal roof directly under the active solar part of the roof. So, like 500 square feet of metal... On it's face it doesn't seem like an enormous savings and optimizing the wrong thing. I eagerly away Elon proving me wrong.