[WalterBright]

An asphalt shingle roof lasts about 20 years, and that's for the "40 year" premium shingles.

Source: my experience

Roofers also tend to regularly close their businesses and open under a new name, so they don't have to honor any longevity warranties.

[fc417fc802]

If we accept what you say then the roof would need to be replaced 4 times instead of 3. Surely you agree that the situation is broadly similar?

Worrying about the longevity of properly installed solar is quite silly.

[WalterBright]

> silly

30 years ago was 1996. No 30 year panels have lasted anywhere near 30 years yet.

[fc417fc802]

And your point is?

How long would you say a properly installed panel from 2000 made it in practice? How long would the modern equivalent installed in 2025 be expected to make it? And how many replacement events does each of those make for over the course of your life?

Do you contest my earlier claim that solar is roughly equivalent to wood siding or an asphalt shingle roof?

[WalterBright]

> And your point is?

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.

[Timon3]

> Using 30 years as a lifetime for solar panels is risky as there are no solar panels running for 30 years, not even close.

Are you sure about that? https://www.chemistryworld.com/news/30-year-old-solar-panels...

All the results I've seen indicate that solar panels will keep producing electricity long after those 30 years, just at a reduced rate (but seemingly still >50%).

[amanaplanacanal]

The article you linked to says at that age they are still producing over 80%.

[WalterBright]

How is generating only half the power going to work out?

[djanogo]

30 year roof will get replaced the same year if it gets hit by hail in southern states.