Quote:
Originally Posted by johnsiddle
Just out of interest how do you switch the high voltage off when parked, you just cant put 500amps thro an ignition switch.
Is that why I was looking for contactors yesterday Woodsmith????
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Yes, that is what the contactors would have been for.
The ignition switch would control the 12V coil on the contactor and the contactor would make/break the pack voltage.
There would be a precharge resistor across the contacts to allow the capacitors in the controller to charge up first, for a few seconds, before the contacts are closed and so the huge inrush of current is avoided when the contacts close.
This is where the cost of these contactors become a small issue as cheap relays cannot handle the continuous current capacity not can they break high DC voltage without arcing and burning.
The ones I have on the tractor are 200A 80V contacts. They are fine for the 48V I have but I shouldn't open them under full load, 400A, as the contacts aren't rated to handle that. Once, or twice, I might get away with it in an emergency but in an emergency I might find they cannot.
Look up
Kilovac.
Which is best?
Linear Mode
