I've done the math on several applications. As far back as the Ontario gov't boondoggle of rooftop FIT solar paying $0.78 kw/h to recent builds. In the best case scenario, you are pre-paying for your electricity for the next 15 years. About the same lifespan of current solar panels. And that does not include even minor repairs or replacement of charge controllers, bad panels, etc.
Until there is a quantum leap in materials science (or return to the gov't paying $0.78 kw/h, personal solar does not make economic sense except in off-grid applications.
Yes, solar is very important and 'we' , as a society, have to continue to invest in deploying solar so that the technology can continue to develop. But buying, installing, maintaining and depreciating personal solar systems is currently a bad financial investment.