We have several Gentlemen (defined as people who benefitted greatly from a large software company in the Seatle WA area) who have installed full solar systems. The price tag each of them paid was in excess of $50K. I have on several occasions looked into this myself. Unfortunately each time I looked, I discovered that it would cost me an order of magnitude more than the status quo.
The most important class I took in college was "Engineering Economics". For some reason it seems that these Environmental Activists never took a similar course.