Re: wiring diagram and questions
MS has already spoken to the shunt on the wrong side.
I'd add at least a 4 terminal buss bar (150amp rated) to the neg side, maybe to the positive as well depending.
It just makes hooking up all the cables easier and neater.
The positive side should have either a 100 or 150 amp fuse on it as close to the battery as possible.
After the MPPT you should have a fuse rated at 150% of output of the MPPT (for example I have a 30 amp after my 20amp BS 2125 (HV) controller- ditto on the wind gen, put a fuse on it (positive side for both).
Lessons learned are opportunities earned.