What charge controller are you referring to? Not a Renogy 60 amp model. I cannot imagine any situation where you would need 2/0 wire coming into or out of a controller Here's a page from the renogy manual. It clearly states the max wire at the terminals is 4 awg.
Mechanical Parameters
Model Commander 60A MPPT Overall Dimension 449mm x 208mm x 107mm | 17.7in x 8.2in x 4.2in Mounting 430mm x 180mm | 16.9in x 7.1in Max Terminal 4 AWG Net Weight 5.5 kg | 12.1 lbs. Mounting Holes
Mechanical Parameters
Model Commander 60A MPPT Overall Dimension 449mm x 208mm x 107mm | 17.7in x 8.2in x 4.2in Mounting 430mm x 180mm | 16.9in x 7.1in Max Terminal 4 AWG Net Weight 5.5 kg | 12.1 lbs. Mounting Holes
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