Ok, I'll post the drive board schematics in a couple of different versions (PDF, Design Spark).
I was a dummy and bought LEM HASS 500-S sensors. It turns out I should have bought 200 or 300A sensors. The 200A sensor is only good to 600A and I will be using 600A transistors so maybe I should go up to a 300A just for safety. Then again, one should never run a transistor right up to it's limit so the 200A sensor might be OK and then shut down the system if the current goes over 500A or so.
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