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Not an expert here, but working on the same issue. The longer your run, the heavier the wire should be due to voltage drop. Most non-custom systems come with or recommend #10 wire. #10 is ok from your panel(s) to your entry point. From the entry point to the controller should be heavier wire (#4 - #8). You can then splice in a short #10 to make the connections to your controller. But the heavier wire on the long run will reduce your voltage drop, which is an absolute must if you are going to get the needed voltage out of your panels to charge your batteries and power your stuff. Even heavier cables should be used between your controller and your batteries (#2) and from your batteries to your inverter.
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