My lynx setup connects a MPII w/SCC, 2 Orions, and the DC load center. It's a bit of a compromise and you need to size wires and fusing carefully when doubling up on single fuses. The wire used to each orion was big enough to work with the 100a fuse that covers the combined circuit. The scc and 12v load is more of a compromise because you potentially have power from the SCC running to the DC load side unfused (since that is all downstream of the fuse), but the SCC has short circuit shutoff built in. Again, it's a compromise, but I didn't think it was worth adding a separate fuse. I went with 2 x 2/0 runs to the multi because it worked out perfect with spools of 2/0 that I bought for battery runs also. It would have been fine running 4/0, it's just that much harder to work with and more expensive compared to 2x 2/0. 2 x 2/0 also supports more amps at less v drop compared to single 4/0.