Hello. Please, in simple terms and explicit direction tell me how to install the Victron Orion 12 I 12-30 unit. The manual seems to assume I should know what I am doing but I don’t. What connects to what. How is it to be connected? The diagrams all indicate the alternator and the starter battery. Is that necessary? Then what? The little boxes for the wiring are square. Do I need to find a casing for the wire? Please provide idiot proof step by step instructions as I can do the mechanics but the electronics are well out of my league.