You can use their calculator to edit any of the assumptions, and the math is fairly transparent.
The question of installation is a straightforward challenge that's easily testable, presumably they have a solution that works or they wouldn't announce yet. It's pretty obvious to see if it's going to work or not: just send a team out to put on a test roof and see how much work it is.
The question of installation is a straightforward challenge that's easily testable, presumably they have a solution that works or they wouldn't announce yet. It's pretty obvious to see if it's going to work or not: just send a team out to put on a test roof and see how much work it is.
[0] https://www.tesla.com/solarroof