Currently I'm building the electric part in my converted RV. I got all components that I need and want to start to wire them now. But my biggest lack of understanding is the grounding part.
The power inverter needs to be grounded, that's for sure, and is mentioned in the manual. Grounding the AC breaker box is for sure, just because it's 120V and needs to be grounded. But I'm unsure about grounding the battery bank. I asked an electrician and he told me that I don't need to ground my battery bank. But after a lot of research I found many diagrams online where the battery bank is grounded.
So my questions:
Do I need to ground my battery bank? (2x 12V GEL Batteries connected in parallel)
When doing this, will I have problems with the lights, heater etc. of my RV? Everything is just connected with a plus wire and grounded to the metal frame. My starter batteries are grounded to the frame as well.
When doing this, which cable size should I choose? Mostly all other components are wired with short 4 AWG cables. But the grounding wire will have a length of 7 feet.
Can I ground the AC breaker box on the same metal frame as the other components? For my understanding I've the 12V minus and 120V grounding connected on the same place. Is this possible?!
The manual of my solar charger mentioned that the charger is positive grounded and when I have a negative grounding system I shouldn't ground it. So I don't need to ground it? I attached a screenshot of the manual.
I'll appreciate your help.