Does anyone know at what ambient temperature the Clarity must be plugged in? Mine recently failed to start and gave numerous error messages on the dash...none of which were true. I plugged in the car and the next day...all good. The battery was nearly fully charged before I plugged it in. My worry is not being able to plug in anywhere and having to leave it outside in the cold. By the way, this happened in my garage. The temperature was still above freezing. Any thoughts or facts??