BOC retail 50mm2 cable for $17.10 per metre in a 10m length. $19 a metre for 3m length.When I built solar arrays for lighthouses in the 90’s we’d buy welding cable also. The thought didn’t occur to me this time round. It was about $35/m at battery world but they also crimped the terminations for me.
I found that the counter staff will knock 10% off retail if you sign up for their loyalty scheme for free.
I have my own big crimp tool, so didn't need anyone to do the connectors for me.