Hello everyone :D,
please check my schematich below. Feel free to criticize the schematich.
Here are some side notes:
This PV schematich is intended to be installed in Germany on a camper van. 80% of the time it is off grid and 20% on grid. Since I have not a GND connection on the DC side, I want to protect the postive side as well as the negative side, as it also proclaims the German Law. 3 x Pylontech US2000 batteries are used. The PE is connected in our case to a grounding strap for cars, which touches the surface of the asphalt.
Here are some short things, where I am unsure:
Should I connect the PEoff the Grid to the PE from the van. The MCCB at the Multiplus is really obsolete in my opinion, beacause all supply lines (which go to the multiplus) are protected. Unsure about the ESS, because it is actually only for on grid applications, maybe a HUB2v2 is a better option, but no one is using it.