I was not sure if this was better suited for Automotive Stack Exchange, but here goes. I'm tying to redo the fuse panel in my Airstream and I have some questions about the best way to wire it. The current panel is wired like this. The system has two batteries that are connected in parallel, and fused across each battery. Currently there is no off switch other than to disconnect the battery. I'm looking to replace with modern components like this fuse block but also potentially ad a duel battery switch like this one. My question is this, what is my optimal setup, if the batteries are matching batteries, do I need to fuse them both, and do i need to do that on both the negative and the positive side like the current configuration?
The three configurations I envisioned are below, not sure what is overkill. Also, thought on using ANL, vs Maxi, VS AGO fuses for the bigger fuses ? the ANL fuses take up allot of space and as you can see from the photo space is limited.