Lots of electrics and electronics undergoing thermal cycling, not exactly lasting forever either. Some expensive pieces of the setup have much shorter warranty than panels themselves, and then there is cleaning and such, necessary in some setups and areas.
One interesting way we can see how it's all about the virtue signalling and carbon credit schemes is that no one cares about pushing solar energy on tropical countries and instead it's the more virtue signalling prone northwestern countries buying up ridiculous amounts of the hardware for themselves, instead of doing a sort of exchange and getting oil and gas that third world countries would normally use instead (in rather low tech power plants at that).
After all, solar panels placed there would deliver several times more electricity over their lifetime, while for climate modeling it doesn't really matter where exactly the CO2 was released. But it does matter for subsidy schemes and bragging about which country lowered its emissions...
