I am not aware of any good solar punk wiki projects. There are however several other great wiki projects online that we can link and and contribute to. Here are a few wiki projects related to the environment, sustainability, and various diy technologies

Hacker | Solar - A knowledge repository on all subjects related to the practical application and praxis within the Solarpunk movement

Appropedia.org - The sustainability wiki

Energypedia.info - A wiki for renewable energy, energy access, and energy efficiency topics in developing countries

Open Source Ecology.org - A wiki for the Global Village Construction Set (GVCS) – a set of the 50 most important machines that it takes for modern life to exist – everything from a tractor, to an oven, to a circuit maker

Localwiki.org - A wiki for anyone, anywhere to be able to learn about where they live — their local government, the history of their neighborhoods, streets, social movements, noteworthy local figures, social services, schools — every facet of life in their community.

On the topic of high quality information of the commons, I think what we really need is a decentralized federated wiki technology, like lemmy but for wikis. One that uses some combination of consensus based peer review, version control, and author accreditation. As far as I know, nothing like this even remotely exists - yet.

Edit 01 - Added Hacker | Solar! There are some good articles, not alot of activity in the past year
Edit 02 - I just saw the post talking about the official slrpnk.net wiki! Great work folks!