Nobody really seems to know how long domestic dollar installs will last all the guarantees seems to be based around them still being ~90% after 20-25 years but even after that it doesn’t mean you have to replace them they will still seemingly carry on generating power for ever just at an ever decreasing rate. Assuming the decay is roughly linear you are talking 80% after 50 years which is still going to be a decent amount of power. The real question is in 20-30 years will the tech have improved enough that we want to upgrade?On solar panels themselves, the Jinko tiger series mentioned before look like they maybe good value for money just need to find an installer for them and compare prices.
I'm also interested in REC alpha as a potential more premium option. They have very good ratings close to LG and sunpower but meant to be cheaper.
Longi himo4m are another option similar to the Jinko. Generally an upper midrange brand. Produce huge amounts of quality panels.
Futurasun silk pro look pretty good but I can't really find any pricing info but are Italian based and have good performance guarantee 87% after 25 years and over 20% efficiency.
Thing is most solar panels are guaranteed for 25 years. This doesn't mean they are crap over night. There are many thoughts out there believing they will go on for 35-40 years. Of course with degredation continuing. This is the main reason the REC alpha panels are getting my attention as their performance guarantee is 92% after 25 years as long as they are a good price of course.