[jetskier]

10awg would work from the panels to the controller if you run half the panels in series and tie them in parallel at the combiner. If you're doing a full parallel system, you will need the larger size. 2 or 4 awg from the controller to the batteries is optimal for the 100a controller output at 13-14 volts

My 855w array operates at around 50-55v at 17 amps in peak conditions feeding the controller. Well within the permitted current limit of 10awg wire (30amps).