Quote:
Originally Posted by mechman600
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.
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. |
I was wondering about the other way around. Can a 96v contactor work for a 72v system, which will at a later date be upgraded to 96v?
As for the pre-charge resistor, what ohm is recommended for a small setup like a 72v motorcycle? What goes into determining what ohm rating to choose? I know what ohms are and I now what pre-charging does, but how does the ohm resistance matter?