Circuit Breaker vs Maxi Fuse

Here is an updated schematic

1WzTrQO.jpg

Why the fuse/breaker in the charge line? If you are using the CD, what purpose does the charge line protection provide?

Master disconnect side, think along the lines of a river and smaller tributaries that drop off of it. The main line needs a large fuse feeding the system. Each smaller stream needs a smaller fuse to protect the equipment at the end of the line. You have to think about where you want pull power for big draw items like headlights, elec fans, heater blower motors, etc.