I've made a few small changes to my plan - the battery sets are about two feet from each other and will be connected by 4awg wire.
I'm not sure what size fuses, though. I have 3 100w panels (but I'll probably add a 4th) that are connected with 10awg. The run is fairly short - about 6 feet. The controller, a 40 amp Renogy, is connected to the batteries with 4awg wire. The run is maybe 30 inches.
All connections are crimped, soldered and wrapped because I love using my torch. I so rarely get to play with it.
So I'm thinking 30amp fuse on the panels and 40amp fuse on the batteries. Does that sound right?