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I've ordered some parts finally to test the "1000amp" again. The 5 seconds at solder temperature approach to soldering the backs of the mosfets seems to work. Well, at least it is working well with the IGBTs in the AC controller. But I'm going to test 2 mosfets, 2 diodes at around 160 amps and if that works OK, then it's a go ahead to do 12 of each again. I really think it was the soldering method that messed things up last time.
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