I am trying to make a diagram for caravan electric system.As a part of it I have to recharge my batteries from shore/main current. I am thinking of using 230Ah AGM batteries. I will use a 30A 12V charger to charge my batteries from shore current. But I am not understanding which cable should I use to connect the batteries with the charger?
I have been searching a bit and found that most people use 16mm cable which are 110amp - to charge their 110amp batteries. so from there I get the idea that I need same amp of cable as my batteries.
But then again when I search for 230amp battery cables then search results come up with cables rating with awg.
So, how do I decide on the cable? there are awg, amp, mm for cables.