What you found was AC voltage on the PV lines which is what Adam had on the 6500ex which also ties to what @HighTechLab mentioned.Do you mean that you had a pv conductor connected to the box itself - not just to breakers inside it? That would certainly explain part of the picture - especially that you had trouble once you connected the combiner box to ground as well. Maybe I'm misinterpreting what you mean.
I know in the manual for the 6000XP, the only thing it says about grounding the array is "Do not ground negative PV lines, only solar panel frames".
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