It’s a logical question, you’re speaking with a representative of a solar company and you start doing the math in your head: “If this is an investment on my home, will I see the return on that investment when I sell my house?”
Like most things pertaining to home improvements and their relation to the home’s value, there’s no exact figure a seller can rely on every time. There is a large enough sample size that we can reasonably estimate that a kitchen or bathroom remodel will likely yield a return close to its cost, but there are exceptions.