With the low-voltage disconnect, I'm hoping for much longer battery life going forward -- and lights that stay on longer. The low voltage disconnect will prevent the battery voltage from going below 12.1 volts when I leave the inverter or lights well into the evening.

8 gauge wire with a 60 amp fuse now brings power back to the truck cap. While right now I only have a 20-amp load, I wanted to have options to add additional accessories in the truck cap, and have as little line drop as possible in my truck cap.

From top to bottom --

Wire for power to CB Radio, Dashboard Camera, Smartphone.
800 watt Inverter
Low voltage disconnect
Low voltage disconnect remote (small module to right)
Fuse to Rear Truck Cap Power
Solar Controller (to be hooked to Solar Panel when using it)

Yes, I need to vacuum out my truck.