1/0 is used in small 6 and 8 cylinder cars for the primary battery cables, 2/0 for diesel engines and 3/0 to 4/0 for heavy equipment engines.
When I had a new 2500 watt inverter installed in a previous motorhome, they used 00 gauge wire (also written 2/0) which has a diameter of 0.57". Larger diameter wire will result in less voltage loss over a longer distance.
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