On top of that, 2/0 welding cable is typically smaller than 2/0 CA power wire on the big brands. 1/0 Knu, Kicker, RF, AT are all very oversized and closer to 2/0. You wouldn't be gaining much, I would dare say not worth it unless you could sell off your old wire to cover the cost and/or you are at absolute max current potential on the 1/0 as stated by an-i-no
Originally Posted by Supergumby5000
You would need a serious charging system to need anything larger than 0awg.
Yep, remember 1/0 will carry all of the current a ~300A alt can put out.