Residential transformerless inverters that aren't grounded to neutral have been the standard for a decade. No need for confusing language in the code. Grounded and ungrounded transformer inverters still have their place, but referencing to them isn't necessary. Keep up the good work.

What about when the array is on a the roof of a separate building more than 20 meters away from the main building? How do we install SPD devices in such configuration? If the cable trace is that long wouldn't it be inefficient to install the SPD at the box in the main building only? Wouldn't in such case a separate grounding rod and SPD at the separate building with the array be a preferred option?

I work in solar and I got in an argument with the "electrician" that ground rods are Required by code for ground mount array, even though the metal support was driven in the ground 8 feet. And on top of that he said we need 2. So am I right that they ARE NOT required?

Same here. We were doing small cell 5G sites with 8x8x 12 foot deep concrete encased steel reinforced pole bases with a #2 tinned copper wire attached to the rebar out of the concrete. Ole inspector walks up and says "Wheres your ground rod? gotta have a ground rod". I said really? You think that a 5/8x 8 foot ground rod is required and is gonna do anything? Non educated is what they are.

What about grounding requirements for a stand-alone (off-grid) PV system installed in a floating boathouse (covered metal dock on plastic floats, not a houseboat)? There is no utility connection with a grounded service disconnect. What do I need to do to provide a compliant ground for panels, inverter, stand-alone load center, etc.?

now, get the ahj to agree with this

What about a line tap pv system. It does not have a ground conductor. Where do you pick up the grounding?

now explain how to adapt this too a GROUND-MOUNT Arrays 300' from the House Wiring SYSTEM ... ...