So the OP asked if he could do it, not whether it was a good thing. He can do it, and it is not a good thing.
Some poster correctly posted that the fuse protects the WIRE itself, which if not protected can become hot enough to cause fires anywhere along its length.
In fact a fuse (or breaker) also may protect the item(s) at the end of the wire from catching fire.
In the 80s I worked for a super computer manufacturer. The computers
were fed by these mongo power supplies capable of providing enormous currents. One day we came in to work to discover a machine shut down. On investigation we discovered a board inside the machine where the ground plane and +5V plane had shorted. Because the power supply had to be able to supply so much current, it did not even hesitate in supplying enough current to feed this short. The short melted the board itself (and set the fiberglass
on fire in the process), creating a bigger and bigger circular short around the ever growing hole in the board. Eventually a smoke detector went off and turned off the power to the whole room.
I have to admit I personally had never before seen a circuit board with a board burned to a crisp by a power supply that refused to current limit. We eventually installed a smoke detector inside of the computer's cabinet to detect such an occurrence and went about our business.
The battery bank should have a single ground lead and a single hot lead brought out to a distribution panel. There should be a fuse between that panel and the battery. After that there should be individual circuits, with a hot and ground lead going off to things like lights, electronics
etc. Each of those circuits should be fused at levels appropriate to the intended load.
And yes, a fuse should be in the hot lead. Fuses
should always be sized for the wire that the fuse is protecting. Wires have current ratings and the fuse (IIRC) should be determined by that rating.