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I was recently using some "anti corona" or something cable that was very flexible, and used in my job's transformers. It was stranded 11 gauge, and had a working voltage of 5000v I think. I also used some 15,000v wire. It felt flexible, but when I would strip the black insulation, it was like it used to be stranded, but looked welded together. Strange. Oh well. I don't know the cost of it, but it was off of a 5000 foot roll I think. I would look to companies that make components for PDUs for high voltage parts. (power distribution units). My company recently made an on/off switch that's rated for like 100,000v. There's a whole world out there where high voltage is no impediment. So, I know you could reliably get a 800v or whatever controller safely working in a car.
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