I have 4-Canadian SC6P-220w Panels with the following spec's, Pmax=220W Voc =36.60V ISC =8.09A VMP =29.30V Imp =7.52A Voc-coef =0.1281V/C Noct =45.00C 15A fuse rating/series Per actual meas...
Using the Y connector means that you will double the amps on that 10' section of wire resulting in higher loss. You may be OK with that approach.
I would either use a combiner on the roof and say 8 gauge wire to the CC or just run the 4 10 gauge wires to the CC. So 20' of 8 gauge plus combiner vs 40' of 10 gauge.
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