There are! This is outside US (Sorry, page is in Japanese) https://www.ichijo.co.jp/technology/energy/solar/ https://www.ichijo.co.jp/technology/energy/solar/ T

There are! This is outside US (Sorry, page is in Japanese) https://www.ichijo.co.jp/technology/energy/solar/ https://www.ichijo.co.jp/technology/energy/solar/ They are famous for integrating their supply chain, controlling all of the build. If it is possible to make it work financially, they should be able to do it