Wonder whether it is intended that every building with solar panels be mapped as power generator?

Looking at https://wiki.openstreetmap.org/wiki/Tag:power%3Dgenerator and https://wiki.openstreetmap.org/wiki/Tag:power%3Dgenerator understand the key is intended for infrastructure where the main purpose of the structure is power generation / distribution; 

In some areas one finds solar panels on almost every building; as an analogy: we do not tag garage-doors? 