Dan, your Sevcon will normally try its best to make the motor turn as it's commanded so it could indeed cause an overload of the discharge C-rating and potentially damage the cells. I wouldn't try to protect them with a fuse because it could fail right when you need it. Consider increasing the available C-rating (big cells, paralleled cells or higher C-rated cells). Alternatively (but more complex) would be an active current monitor (shunt + microcontroller) that would monitor battery current and (first) sound an alarm and then (second) disconnect the contactor before damage could occur. This approach would allow an emergency override so the you could sacrifice your batteries to save the boat if the situation demanded it. I'm following this approach in my build using ESP32-based microcontrollers.
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