Using 30 years as a lifetime for solar panels is risky as there are no solar panels running for 30 years, not even close. Never mind the lifetime of the power wall battery and the inverters.
I bought a 40 year "premium" asphalt roof. It barely made it to 20. A regular asphalt roof, perhaps 10 years. Now I have a metal roof.
Using 30 years as a lifetime for solar panels is risky as there are no solar panels running for 30 years, not even close. Never mind the lifetime of the power wall battery and the inverters.
I bought a 40 year "premium" asphalt roof. It barely made it to 20. A regular asphalt roof, perhaps 10 years. Now I have a metal roof.