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Combine cables by panels or pull separate cables ?
With the 3s4p array, I wouldn't be happy with the 4x 7.67A = ~30.7A in 6mm2 cable, it's going to run pretty warm.
If you get a cold clear good sun day you can get more than the NOCT current sustained. Good idea to have some margin.

(09-23-2020, 12:26 PM)donnib Wrote: Now i just need to find out whether i want to combine using Y, MC4 connector the strings before running the cable to the MPPT charger or combine things in a terminal block  Undecided

I'd use terminal blocks in good UV rated boxes with proper cable glands. Water gets into everything.
Also MC4 connectors are only rated for max 20A.
Cheap 4-life likes this post
Running off solar, DIY & electronics fan :-)

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