Is that really such a big thing? And even if it is, it's not like roof tile panels are impossible to know about. For starters, they're not actually completely invisible - you can usually still tell. But more importantly, there will still be construction that your neighbours will ask you about ("hey, whacha building, neighbour?" "oh, not much, I'm just replacing my roof with solar tiles. Y'know, for the environment!") and you can surely subtly brag about it. Word travels fast so everyone around would quickly know and I'd imagine rich people would be far more impressed by someone with a beautiful roof and high-tech solar tiles, than someone installing the same ugly panels everyone and their dog have had since the early 2000s - same level of environmental signaling, but far more impressive.