1. When paralleling any kind of switch, it is necessary to arrange for equal sharing of current, otherwise you risk one switch carrying too much current and becoming smoke!
2. When paralleling pulse width modulated controllers, it would be unwise to simply parallel the complete controllers. You need to assure break before make for some of the switching cycles or else some current may be driven backwards through some of the FETs, thereby increasing the forward current the the other FETs that are in the conducting state ... again overloading them.
3. For applying an overvoltage to your electric motor (not wise unless it is force cooled with water or air), why not simply disconnect your controller and directly connect the motor to your battery string. You could use a marine switch designed for high DC current that in one position connects the Controller to your motor and in the other position connects your battery to your motor. That switch should break one circuit before closing in the other circuit.
HAVE FUN, but do so safely.
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Posted by: jcelrock@hotmail.com
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