I'm sure I'm preaching to the choir here, but I read the manual for my car (it's next to my toilet) and have navigated through every configuration menu in the various consoles.

Even then I still had to watch a few videos to figure out how to change my charging rate. It was hidden behind a number of hard-to-find settings and is disabled (silently) in many car modes (basically you can only change it when you're in "car on but motors not running and not charging")