Since most folks seeking advice on solar are searching for answers to rather simple questions (at least in the technical aspects), a search window lists all the pertinent information across all of the Forum and therefore, a separate section for just solar doesn't make much sense, IMO.
If the administration followed the lead that the OP advises, there would be separate sections for converters, inverters, 12V systems, generators, etc. That is just too much organization.
Anyone wishing to find information about solar can post in the "Tech Issues" section of the Forum and there are many enthusiastic users of solar that can offer even the most minute details or links to where that information resides.
FYI, CA traveller has comprised a thread of Forum member's solar installations:
Member's solar installations