All three systems would have their own independent cabling run throughout. The 230v system would also have super safe 30mA circuit breakers covering each and every plug socket outlet. One thing that had annoyed me when viewing other barges running 24 and 12 Volt lighting systems, was that as soon as any second light, pump or toilet was used, lights flickered and dimmed everywhere else. Some barges were more like discotheques than floating homes! To me this wasn't good enough. At a not inconsiderable expense, I ran separate, thick, over spec. cables to every section of the ship that would require 24 & 12v appliances and doing so has totally eliminated the dimming. Less power being carried through each cable also means less heat which resultantly lowers the risk of fires that can be caused by overloaded and over heated low voltage electrical systems. The main panel had to be built in the saloon but be done in such a way that all the pieces could be disassembled and rebuilt in the engine room. To move the heavy batteries I built a little trolley and series of ramps enabling me to roll and slide each of the cells between locations.