Help with off grid solar Systems

[Gforce686]

Hi I am a Nubia to this sight . Not sure if I am in the correct location. I live in Newfoundland Canada. I have 45 years in the Electrical and Electronic field . I just got interested in solar power . I am going to build my first solar system . I would love to get as much advice as I can get. The very first question I will ask is between the PV and the controller. I have 6 100w panels and I wanted to use 2/ 40A MPPT EPEVER Tracer An Series charger controllers (1) should I run all 12 AWG wires down to the controllers this would be 6/12 AWG pair of wires to the controllers and use a combiner box near the controllers . Or Should I use the combiner box near the PV and run 2 pair of 2 AWG wire to the controllers