According to specs on the company webpage, the 12 volt unit draws 5 amps. The sales rep at Arctic Air said the smaller units draw about 4.5 amps so you may be able to get by with what you have. If you want one of the bigger units, the current draw would be higher.
Usually electric motors draw more during initial start so if decide on a small unit and your cigarette lighter is protected by a 5 amp circuit breaker or fuse, you’ll need to check to see if the wire gauge is large enough to handle a larger than 5 amp starting surge. If the wire is large enough you may need to install a larger CB or fuse (8 amps).
