[MPaulHolmes]

I think the soliton1 used to have the peak current set to 1400amp. I'm not sure though. Now the current is 1000 peak and continuous. They use the same cap, but I don't know about the IGBTs.
EDIT:
"It can work air cooled by programming lower power demands. For NEVDRA racers it can be programmed up to 1400Amps (EVnetics approval racing warranty must be agreed to in writing)."

Maybe that's for 1/4 mile drag races? I got the 600v 600amp igbts from Tesseract on Ebay. They were from 2010 and 2011, and I imagine he uses newer ones with lower losses, but all that makes me guess that 1400amp peak for around 10 seconds would maybe be OK if you figured out a way to have good cooling. The aluminum plate isn't going to be sufficient. But you are also not running it near 350v either, so there won't be as much heat generated as that case.

I'm curious to see how the copper sheets work out. There are no large bus bars attached. It's 16 ounce copper, which is 4 times as thick as the 500amp power board. I know the power board doesn't vaporize at 600amp, as people have run their controllers at that level. If you double the current, you multiply the heat loss by 4, so 1200amp would probably be OK. I really have no idea, and am interested in seeing what happens.