I kept firing up the torches at the back of the car this afternoon, and every time I did I thought, "wait! gasoline fumes!"
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I don't think the cables will melt. Unless I really misunderstand what's going on, the 4/0 is WAAY overkill. The internal wiring inside the motor itself is more like 2/0 size. That's what I'm more concerned about melting...
In further "misunderstanding what's going on" news, today was the first time since the start of the project I mistakenly shorted out pack voltage. Freshly charged, too. !!!ZORCH!!! I vapourized the end of a 2/0 lug. :O