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All 3 controllers now have IGBTs with freewheel diode matched voltage drop of +/- 0.001v under a load. I had some nichrome wire and batteries, and it made for a good constant current test. It's supposed to be within 0.05 according to an application note on paralleling them. The differences in drop from the IGBTs turning on should be small, but it won't matter, since each M+ cable will correct for that difference.
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