That’s seems ridiculous: where are you? Are you sure that’s just solar, or would it also include batteries, maybe a “solar roof”, instead of solar on the roof? As far as I know, most of the systems (in us at least) are designed for shingled roofs: do you have tiles or slate, or something?
Where I live in the northeast us, it’s typically $20-30k for solar panels on my roof, only. I don’t need batteries because I’d stay grid-tied and my roof is pretty new. That’s still ridiculously expensive and beyond any reasonable payback but state incentives make it much more reasonable. They claim 4-7 years payback but since I can’t follow their math, it goes into the bin with the rest of advertising hogwash