I have had better luck finding the electrical connectors and wire I needed for high amp usage at West Marine or other discount marine stores. I live right next to a Home Depot so I start there for the basics but I prefer the marine heat shrink tubes and butt connectors(preglued). Marine terminal boxes, switches, buss bars, etc are pricey but choices run from 30amp up to 600amp (DC). Ours also has a wire section where you can use their cutter and crimper for the really big stuff ( 2-4 "0").
Jan and Rocky
Volunteers USFWS. 8500 hrs each, 28 refuges. 04 Allegro 30DA, WH 8.1, Banks, 2012 Jeep Liberty , Brake Buddy Adv Select, 300watts Solar,
"Philippians 4:11-13 KJV"