A vehicle air-conditioning system, including: a DC-to-AC inverter, for supplying alternating current to the alternator of the vehicle from a battery, for rotating the wheel of the alternator; mechanical connection between the alternator wheel and a wheel of the air-conditioner of the vehicle; and an operating element, for user-operating the DC-to-AC inverter and the clutch of the mechanical connection, thereby operating the air-conditioner without power of the engine wheel.