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Originally Posted by duncan
On the way back I sort of gave it full welly at about 50Kph - spun both back tires and nearly crashed the thing
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I believe that this sort of thing is a real problem. When you have that much power on tap, you sort of need traction control to keep you on the road!
Quote:
That did reveal a problem - it seemed to weld the Chevy contactors together,
I'm most disappointed it was only about three times the Chevy current
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That *IS* weird. At 3X rated current, it should not weld for 20 minutes or more.
The contactor rating should matter when you are switching ... Like if you close the contactor without precharging the capacitors, or the contactor tries to open when you are drawing high amps on acceleration.
Is it possible that the voltage sagged badly and the contactor did try to open .. and welded itself shut? I have had the contactors drop out when the 12V supply drops to 8V or 9V and the DC/DC converter output drops .. not sure how far it drops.
*EDIT* read a bit further up the thread and now know this is an IGBT build