2 AWG Battery Cable 2 Pcs, 5.9 Inch Battery Cables with M8 Ring Terminals, Marine Battery Cables Pure Copper, Battery Ground Cable for Motorcycle, Car, Truck, Rv, Boat

Yeah, some people over complicate their setup, and some are very dangerous, they have the negative and positive busbars too close, if you notice on a battery the posts are far apart to prevent contact, the same should be for busbars. Anyway my setup wouldn't change much for additional batteries or panels. To add a battery, I would just use a short negative and positive wire to connect the battery. Like this. https://a.co/d/03goe0Z3 To add a panel, I would use a splitter to connect the panels, I would also add a breaker to the wire coming in from solar panel to solar controller, I do have one coming in tomorrow. I will be adding this type breaker tomorrow. https://a.co/d/029Rw09H Splitter for additional solar panel. https://a.co/d/0ff2YdkU