Revit gives us a lot of standard functionality to perform solar analysis. But the developers can never create a tool set that is a 100% solution for everybody. One of the big advantages of Dynamo is that we can tailor the software. Within Dynamo we can also install addins or packages. In the past we already got from the Autodesk team a package wirh Solar Analysis nodes, but it expired some time ago.
Now I see that yesterday they’ve published a new version in the Dynamo package manager: