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well I wasnent sure, but I thought it was very heavy so ill give it a try, besides it was the right price, free is always the right price. the ac is still going strong, allthought it hasent been getting used latly. I think the problem with the IGBTs is operator error, iv been diong some reading and, maybe it gate memory, but it seems like the gate keeps sticking turning the igbt on all the time, may be its just the circuit im using, its 324 based with current limit and uses a 4421 igbt driver to drive the gates, iv paralelled two 500 amp mosfets and it has happend twice. while im talking to you jack, in an earlier post about IGBTs you said you were using something like mg400qus41 and that you could use the diode in it as a freewheel diode, i would like to know how to do that, I put seperate diodes on mine for freewheel diodes, ill look for that post and read it again.
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