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Typically they’re warranted to keep supplying something like 80% at the 20 year mark. They’ll actually keep producing a lot longer than that.

They can however fail like any piece of electronics (source: I owned a panel that failed due to cell foil contact separation).

So I assume the panel was replaced under warranty? Was everything pretty much covered, or maybe you had to pay for some installer labor?

I did not know that. Thanks!

The panels I will be installing guarantee 90% output after 25 years.

Europe's oldest grid-connected PV system is 35 years old, and still running. Inverters had to be replaced 5 times though.

The life span of the inverter also needs to be considered