The inverter should be next to the largest battery bank or attached to an off location standalone bank. If you look in your manual, the DC wiring section should give an appx location of the inverter is its a factory install.
You should have three fuse locations... when I say fuse, it could be an actual inline fuse or a breaker in the breaker box panel.
Fuse 1: AC in (ie: Breaker in box that says Inverter) -- Maybe 20-30amp
Fuse 2: AC out (ie: Inverter breaker sub panel) -- Same as Fuse 1
Fuse 3: DC between battery and inverter which is could be as high as 250amps
Note: You will probably have a 4th breaker from the sub panel to the outlet breaker(s) which would probably be a 15amp
Fuses are based on wire size and not really inverter power. The inverter will usually trip or reset on its own if you try to pull too much power (watts/amps)
More then likely the AC fuse(s) should be a 15-20 amp AC fuse and the DC should be based on the DC battery wires which could be something as small as a 100amp DC fuse for 2 AWG or 250amps for a 2/0 AWG cabled (2000watt inverter). Plenty of fuse wire sizes charts on the net.
In my 4600 it "would" have been here... by the table or where maybe where the black/fresh water tanks are.