> Max rebate = payback in 8 years
> No rebate = payback in 13 years
What discount rate did you use in those calculations?
The ones in the article.
My apologies. I didn't see the "13 years" cited in this article. I was going off other estimates I've seen that say actual payback, without subsidies, can be much more than that (as much as 25 years--which exceeds the expected life of the solar unit altogether).