I bought a $15k system in 2013, and if current trends continue it will have paid itself off 7 years after installation. I was interested in solar purely as a me

I bought a $15k system in 2013, and if current trends continue it will have paid itself off 7 years after installation. I was interested in solar purely as a means of reducing my carbon footprint; I was surprised to learn that it had already become such a good investment, too. I'm glad to hear that the numbers have continued to improve. (I could have gone bigger and come close to covering all of my household power needs, whereas the current system gets maybe 60% or so, but I'd have had to cut down the big old cedar tree which shades part of my roof, and that just seemed like it would be missing the point somehow.)