I have a solar array on my roof. If I find my house in OSM, there’s a lightning bolt icon indicating there’s a solar array present. Not only that, but the exact layout of the panels in my roof is shown. I never submitted this info to anyone, Google Maps Satellite view doesn’t show them. I’m really curious where OSM got such detailed data.
Did you self-install the solar or could the company that did the install (or one of their installers) have added it? Also, I know it sounds crazy, but have you checked Bing maps? It’s been years since I did much with OSM, but I do recall one of the easier OSM editing tools using Bing maps due to licensing reasons, and sometimes their aerial/satellite view is more up to date in sone areas than Google.
I highly doubt the company added it. Most installers don’t even bother to configure the system correctly, let alone create a layout of the panels that were installed