How to choose a hub motor voltage

Start with the battery you will ship. A 48V pack wants a 48V winding. Mixing a 36V motor into a 48V pack raises speed and heat. Changdida lists 24V, 36V and 48V on the CDD-C, CDD-A and CDD-W lines so the motor follows the pack, not the other way around. Send the continuous current of your controller with the inquiry.