If you watch the video, 9.6 years to payoff and 25 years to replacement in this particular case.
My solar roof (not Tesla, of course) is meanwhile 21 years old, and works almost like on day 1. Since I dont expect a sudden failure in 4 years, my guess it that it will last another 10-20 years.
>Since I dont expect a sudden failure in 4 years, my guess it that it will last another 10-20 years.
Oh, you're just guessing.
Turns out that (a) the 10 year warranty actually meant "generating at least 90% of rated capacity in full sun after 10 years, but pro-rated across 10 years if not" and (b) they fell under this level after less than 5 years.