Soldato
Its also for me to know if they are worth it also.‘We should install solar, we will save X over 8 years. It costs Y, our bill is Z. after that it’s free electricity.
As long as X is greater than Y and you can afford it the discussion moves away from logic and to the feels.
You are on your own with the latter. We can’t help you if she comes back and says she doesn’t want them because they look ugly (not that a standard concrete tile roof looks dashing mind).