9 x 270 w solar panels in 3S 3p
Max 42v - 9a
I generally use 10awg (2,5mm) solar panel cables . This system has 9 panels in 3 series of 3.
If i wire and use Y MC4 (without a combiner box), I could have only 1 pair of solar panels cables from the roof to the MPPT which is 90 feet away.
This pair will roughly support 120 v and 27a at max. I am a bit worried with the size of the cables .
Would you think 10awg is large enough for this ? Or would you consider preferably:
1/ a combiner box close to the roof and then a larger cable to the MPPT ? May be 6 mm.
2/ or leave 3 pairs so each will be 120v/9a which is more acceptable for this size of cable ?
Thanks for your input.