No it will not damages: Actually this charger is rated up to 260 volts with an auto range of 100 volts. (100 volts to 260volt auto adjustment) Also Amperage is automatic as well; as it is requested from car’s computer it adjusts automatically from 4 amps to 16 amps , and connecting to a 30amp outlet is fine (minimum of 20 amps is required, so an outlet from 20 to 30amp rating is perfect)