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Originally Posted by TurnNBurn
If I got the 96v contactor, would that work for the 72v until I expand it? Or would it be a bad idea?
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Depends on the coil windings. Is the coil made for 72V? My contactor is a 12V coil that switches basically any voltage on the contact side. A coil designed for 72V cannot be powered by 96V - it will overheat and fail.
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Also. Pre-charge resistor. Recommended? Or just skip it?
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YIKES!!! Absolutely mandatory.
Without it you will have a HUMUNGOUS inrush of current filling the many caps in your controller when the contactor closes. The result (maybe over time) will be damaged contactor contacts, and controller failure.