I am installing a 2nd 12v battery into my van to run eletronic devices. The 2nd battery is a bank of 2x LiFePO4 12v 120Ah connected in parallel.
My three questions are surrounding the circuit diagram pictured below:
- Is running a ground from the negative pole of Lithium 2 to the negative pole of the starter battery sufficient to earth the system?
- Is the green Inverter ground wire earthed if I connect to the negative BusBar (going to negative of battery bank), and what should the rating of the negative BusBar be?
- What should the amp rating of the positive BusBar be?
I understand cable needs to thick enough to carry the amps in that circuit, e.g. the circuit with fuse block needs to include wire rated for 100A. What about the interconnecting batteries? Should this be rated for the largest circuit, i.e. the 550A from one of the positive BusBars?.