Yes , thanks, it does help. The power pack is temporary for this summer and the electrical build will follow . A 20 amp fuse, and that is on the black, power wire .You want to fuse anything that has power closest to the power source. If the wire shorts out along the way you will want it to pop the fuse instead of causing a potential fire. When I installed mine I didnt read the directions, the black wire is the power and white wire is ground. Hooked it up backwards and the fuse popped at the fuse panel I have.
Best to add a fuse panel that you can expand upon. I have both fans in mine hooked up to the fuse panel I installed with, from my memory, a 20amp fuse. If one of the lines shorts it should pop the fuse. The whole fuse panel is then hooked to my aux battery with a breaker fuse, so power can be killed instantly to the panel and if tripped it can be reset once the problem is found. I believe I bought a 100amp breaker fuse.
Hope that helps.
That's a lot of build. Thanks for the information and photos.Here is my Google photo album of my adventures of building the van out: https://goo.gl/photos/VvnBRkEWzJcWJwm5A
Here is one of my temporary fuse panel setup: https://goo.gl/photos/VkzizgrFDVudzrrn7
Single fuse on the left goes to my 45amp air compressor in that back. All other 12 volt accessories go through the Blue Sea Systems ST Blade ATO/ATC Fuse Blocks - https://www.amazon.com/gp/product/B000THQ0CQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Hope this helps.