Cables can make all the difference. I once helped a guy jump his car. Someone else with a big new Dodge truck tried jumping him, but it wouldn't go. He was using the cheap skinny jumper cables he bought at the "parts store".

I had the set my dad had made from Welding cable. They were 2 gauge I think. The guy's car cranked over without a whimper.

Can't push much power through a skinny conduit.