Panel to Solar Controller Wire Size
As some of you already know, I'm piecing together a solar system. Controller is a Morningstar 45A PWM. Panels will be two 12V 150W wired in parallel. I'm going to be using a combiner box on the roof, ...
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This is what I used to parallel my panels coupler with the 2 #10 in one side and the #4 out the other side and covered in heat shrink. You could use it just before yout controller if the wire is too big. I really like those reducers mentioned above but most times there isn't room for them in the panel... But trimming some strands will work just fine too. Actually my controller lugs were not rated for #4 but I was able to squeeze it in them anyway.
