Check the installation manuals , you'll find ; wiring gauge and fuses ; requirements are different .
Now , just between us
, if you never use more than 1,000 watts , current wiring and fuses will suffice. If you push the new inverter to it's limit; well that's another story.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.