b/c solar cells will be around for a long time Are you sure about that? It's something I always wondered. The efficiency of today's solar panels is 15%-20%. Ac

b/c solar cells will be around for a long time Are you sure about that? It's something I always wondered. The efficiency of today's solar panels is 15%-20%. According to a short google search, researchers have already shown panels with 44%. It seems certain that over time the efficiency of commercial panels is going up and prices are going down. If you have only limited space (e.g. your roof), doesn't it make economic sense to replace your old panels with more efficient and possibly also cheaper panels at some point?