Interesting. It worked out for us. Our cost was $29,200 and we received about $10,000 back as a tax credit. This was in 2018. Based on the electrical rates at the time of installation my memory is that the calculations were that we would recover all we had invested in about five years. I would have to go back and check to be sure. But electrical rates went up quite a bit, and so a while back I recalculated with the current rates (i.e. figuring out what our bill would be today without solar) and we actually had recouped all we had paid for it in under four years. So, now our electricity is free. This is in central California foothills. And now I think the tax credit is less, and maybe gone.