The power interconnect that joins the battery enclosure to the power systems was a big deal for me to get right.
I used two large conduit runs for the cabling. One run carries the negative conductors and the other the positive. The 4/0 cable is the 200 Amp power bus, and the 2/0 cable is the 100 Amp power bus. They’re seperated out by positive cables in one conduit, and negative cables in the other conduit.
The negative conduit also carries some data cables and the E-Stop circuit.