Ninerbikes- what's the advantage of higher volts when the amps are maxed out either way? If I did change the cables, the ones from the panels are 1.5mm or 15 wag to the controller. The controller can only take up to 12awg wire. The 15' cable is also 1.5mm (15awg) from the controller to the battery hookup. The battery hookup is 12awg for the 2 feet. I did make up an extension of 2-10awg tray cable that's 18 feet long. Really stiff stuff.