My limited experience with the type of battery protection circuits you're dealing with in that bike battery is consistent with Matt's. Calling it a BMS is overly generous, in my view, since it really only provides the functionality of an auto-resetting circuit protector. When you're charging, it cuts off the charger flow when one of the cells reaching High Voltage Cutoff, and when you're discharging, it cuts off the flow when it reaches Low Voltage Cutoff or Maximum Current. Depending on the design the over-current reset may indeed be quick as Matt describes.
Given your application, I'm inclined to agree with Matt on skipping the fuse or breaker at this point in your system development. As you continue to develop your configuration, you might also want to track down the ABYC standards for electrical work, storage batteries, and electric propulsion just to stay on the safe side. Just a thought.
[-tv]
Tom VanderMeulen
"Grace O'Malley"
Cape Dory 27
Monroe, Michigan
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