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This is exactly the concern I had and could not see the point of even using a polarized DC breaker since instead of improving safety it actually introduces new risk and complexity (ganging balance of breakers as you mentioned) in paralleled string setups, even if wired correctly. Since PV...

Don't know if still useful but for anyone interested, grounding of PV systems has been a contentious issue since 1994. See this article article.pdf . According to this article ungrounded Class II PV systems (no system grounding but frames etc. grounded) seems to be the safest option but it...

As a side note, the matter of Ground Fault Protection remains a bit of a predicament for me. I am using Victron SmartSolar MPPT's and as such no system grounding i.e. neither of the PV cables are grounded only the frames. I am not comfortable with the scenario of ground faults causing ground...