MAy be my first post, but here it goes, since I deal with solar constantly.
Basic badge can easily involve a lot of that.. 12 volt single battary, why you want a charge controller, the wattage of your panel and battery sizes and usefulness.
More advanced, using different voltage batteries, 3v, 6v, 12v... Stuff to learn why its better to advance to the more intricate charge controllers, why the lower voltage gives you a better reserve to fall back on for battery life.
Extremely advanced. MPPT handling, diversion/dump loads so you dont "nuke" your batteries? In all stages like Mike mentioned, why you want to solder, sizing everything to your load and distance the load must carry is a given.
Easily able to get a Bronze/Silver/Gold setup right away with that idea.
Further, helper sub badge? helping set up and train others to understand HOW to wire their battery banks and Panels to achieve the voltages needed for the power changes?
Distant... Panel setup to capture maximum amounts of power, moving solar panel holders so they can always get maximum direct sunlight, the pro's and cons of the setups?
Hopefully I helped add a bit more idea and insight.
Both the starter, post, and I gotta give credit to Mike..some excelent ideas, all a matter to admins and all on how to run it.
