this is far from the truth. NREL have great reports and ongoing research into how often solar panels fail. You are correct in that it isn't every couple of year

this is far from the truth. NREL have great reports and ongoing research into how often solar panels fail. You are correct in that it isn't every couple of years but it is not as long as 20 years. The number of solar PV panels that have been around that long, let alone survived that long is small.