Since you don't seem to have any training or real knowledge of electrical systems I would highly recommend you seek the advice of a qualified electrical person. I'm talking about someone that knows how to design and understands electrical systems not some Joe's electrical and plumbing service.
This is not a system that can just be thrown together, it has to be safe and designed properly. Your life might depend on it. You need an electrical schematic that shows each connection as well as wire sizes, fuses, breakers etc. You also need to know what type of connections to use for each system, 12v/120v.
Good luck with your build, I hope you do it the right way and not rely on this web site.
