All good answers.
My RV came standard with a single 100w panel and a 10A in-line fuse. I had it upgraded at the factory to 3 100w panels, but someone forgot to change the fuse so I was constantly having to replace it. I contacted the factory and they confirmed the fuse should have been a 30A with the extra panels they had installed. (It is already wired for the optional panels.)
Since the fuse is located in an inconvenient place, I replaced it with a Bussman CB221-30 (from Amazon) which trips on over-current, then after a period of time, resets itself. Haven't have a problem with solar since then.