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The measurement at the panel connector was done when disconnected from the controller. Not sure if that affects the PV output measurement, assumed it did not.

Thank you, I'll try it with a larger load and swap out the branch connectors too, in that order. Cheers.

I have a 2S2P array and have tested all four panels (CS6K 300MS) individually and they were all within specs for VoC (32.5) and Imp (9.24). I use a renogy MC4 branch connector to connect the two series into parallel to the controller and expected the Voltage to be 2X Voc and the Amperage to be...