>I'm guessing it has to be a case of code inspectors not particularly caring or knowing about the DC side?
I'm inclined to agree with this. US electrical code, especially in recent years, is pretty robust and has gotten to the point where people groan about excessive safety features(tamper resistant outlets required in all new dwelling spaces, arc fault circuit breakers, whole home surge protection all make wiring a house significantly more expensive than 15 years ago). Inspectors are pretty good at catching grounding and other issues. That said we don't yet have generational knowledge of PV and battery systems. A lot of installers are still learning by doing, it feels.
Are you sure it wasn't just DIY un-permitted work, though?
I'm inclined to agree with this. US electrical code, especially in recent years, is pretty robust and has gotten to the point where people groan about excessive safety features(tamper resistant outlets required in all new dwelling spaces, arc fault circuit breakers, whole home surge protection all make wiring a house significantly more expensive than 15 years ago). Inspectors are pretty good at catching grounding and other issues. That said we don't yet have generational knowledge of PV and battery systems. A lot of installers are still learning by doing, it feels.
Are you sure it wasn't just DIY un-permitted work, though?