|Panels mounted between fuel hose runs|
Why fuse the '-' lead?
It comes from amateur radio where it is "common practice" to fuse both leads. The reason: lightning does not discriminate the '+' from the '-' wire, it can just as easily strike the non-fused side and fry your battery and/or equipment. In a SSB installation on a fiberglass sailboat, it is common to tie all large metal items together with the ground system in order to get the best radio performance. This includes: life lines, standing rigging, masts, tanks, engine blocks, etc. which turns the boat into one big lightning rod. Anything you want protected from a lightning strike, like batteries, should be behind a (fast acting) fuse. Now lightning strikes are not common around here, but are more likely to happen in tropical areas. Protecting sailboats from lightning strikes, with their big lightning rod sticking up from the middle, is not an exact science. So, it is all down to how paranoid do I wanna be?
Like I said, I am undecided, and I got time. Which ever way I choose, I could always change it later with little effort.