Sure. I can do that now. The math works out so that I'll break even on the expense in 25 years even when I include government incentives... right about the end

Sure. I can do that now. The math works out so that I'll break even on the expense in 25 years even when I include government incentives... right about the end of life for the solar cells. If I lived closer to the equator, my break even point would be sooner, but right now for many people it's a huge up-front outlay for zero benefit.