Hello, for my rooftop PV system I will have 2 series on the east side and 1 series on the west side of my roof. I've seen/heard of system that all have a dedicated, separate grounding wire for each series. I've also heard of people grounding the series together so there is only 1 ground needing to work through EMT conduit to the inverter.....any strong POVs out there either way?