Same here as I didn’t want to cook my alternator. Your multi plus does have a 4 amp trickle charger for the starter battery. Single positive wire from the charger to a positive post at the starter battery. Fuse this wire at the battery.
Staubli connectors are the best and you should not mix brands. Equally important is to use the proper crimping tool. There was/is a video online used to certify installers using Staubli connectors. You can also buy PV cable with connectors already installed. PV cable comes in different strand...
The green ground wire is a bond wire for the inverted AC. It should be attached to the frame of the Moho somewhere. You may find it attached to the frame along side the bond wire from the gen set and main electrical panel. Hard to see in the picture but where is the second ground?
Did you put bigger calipers (more pistons) on your car? Just searching for a reason although air in the system does strange things. High points in the system that would trap air?
When you say you have good pressure on one caliper is it actually clamping or just moving the pistons? Brake pedal is firm when this happens? Is the master higher than the calipers when bleeding?