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

I would say no to charging that many at the same time on just one 12v car battery. Only cause Ive tried it on a ( New) fairly beefy van battery and it didn't like it. Its fine for about 15mins then it just went under voltage.

I now use a 750w Jenny to juice up a power supply. and it only cost a little more than a new 12v car battery......just my 2 cent

[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.