Now the solar wiring is in the interior of the van, I still have to attach it to the breaker box and solar charge controller.

The #8 AWG wire transitions to a #6 AWG wire at the breaker box, to minimize voltage drop, and continues to the bus bars. Meanwhile, I clean up the wiring with cable ties.

I add a 12 count fuse block and connect the wiring to the bus bars. Then the roof vent is connected to the fuse block with a 16 gauge wire. The roof vent allows me to fully test this 12V system.

This minimal setup is now ready for the batteries, which is shown in the next video.