The reason for a fuse between the battery bank and the controller (which should be close to the battery) is to prevent a catastrophic failure. I.E. a short in the wire. Don't forget batteries were at one time used for welding.
In other words the fuse has nothing to do with protecting the controller.
Optimistic Paranoid wrote:
If you run the controller directly to the battery, through it's own fuse, pretty much the only way that fuse can blow is if something has gone wrong with the controller. In other words, most likely the controller is ALREADY toast by the time the fuse blows, and you're just keeping the wire from overheating and starting a fire.
