Perhaps this of interest:
AM Solar "RV Solar Education" pages.
Yes, it's one company's perspective, and obviously has promotional content, but still good info about terminology, components, and total system possibilities presented in a logical manner, IMO.
After becoming familiar with the components and nomenclature from the above I'd recommend forum member Jon Vermilye's blog pages which share a tremendous amount of real-world experience about his Escape trailer solar upgrades and performance, here's a good starting page, follow the links to more:
Lithium Battery project
Just for your consideration, Have Fun