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I've had my controller down to -25C multiple times. Heatsink gets barely to zero celcius even after 20km of driving. I've had few sudden power downs during the winter but it was always quickly solved by restarting the controller. I suspect it was a bad throttle pot causing that issue though. It caused some jerky starts too. I've replaced the pot but haven't had a chance to drive using it yet. I had other issues with my controller lately and am waiting for new power PCB to arrive, hehe.
Does controller shut down if throttle goes way out of range during drive?
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