What wire gauge and insulation rating should I use for connections?
Use only copper wire with a minimum 75°C insulation rating. The wire gauge should be between 10 AWG (5.2 mm²) and 14 AWG (2.1 mm²). Terminal connector lugs are provided for spade-type terminals and each terminal screw should be tightened to 20 inch-pounds of torque. (Pages 4, 39)
From the official Upgraded 30A Solar Charge Controller manual, page 39
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