Wire size wire for...4 Ice chrgrs-20 feet from 12v battery

[BrianG]

That is true! I just assumed the vehicle would be running so the Alternator will be helping out.

If you can get a power supply that can output a solid 14.4v (typical car voltage with vehicle running), it will pull less current for the same amount of power. From my example, 58.8A @ 12v would be the same power output as 49A at 14.4v.