I am going to be installing a whole new setup for my power supply. First I am going to install 2 high capacity batteries that will be dedicated to the stereo, the third will be a battery just for the boat. The charge for the motors will be split via the battery isolating relay. Then I am going to install a onboard 3 bank 4 stage battery charger. I want to be able to simply plug my boat in to an external socket that's permanently on the boat that the cord plugs into. I think it is commonly called Ship-to-shore or Shore-to-ship. Has anyone done anything like this? Whee do you find parts to do this this stuff?