ungrounded Rosie?

[BlackwaterPark]

Anything metal in your system should be grounded. You are totally off-grid if I remember right.  When you installed the main CB panel for the house, that panel has, or should have, a ground lug.  I would either start there, or your main power source if it's not co-located, I.e. your inverter, start with the ground lug on that. Whichever is easiest to get to an outside ground bar.  From that point, you simply run a ground wire to any metal box connected to the system.  Ensure the size of the grounding wire is appropriate for the largest size of the wire you are using in your system.

yes, completely off grid, not near any poles at all actually. Question...if your objective is to connect every piece of metal to a ground bar, why can't you locate the ground bar indoors near your gear and then run a single lead to the rod?  Wouldn't this save on copper and time? Also, the thickest wire in my system is OO for the battery leads (oversized for sure).... surely I wouldn't need a grounding lead of that heft...?

I would suggest reading the Rosie manual it goes into great detail on system grounding and equipment grounding, starting on page 22:

https://www.midnitesolar.com/pdfs/10-432-1_Rev_C_(MNROSIE7048_Manual)_22MAR2024.pdf

So, part of this manual ended up causing even more confusion for me. They state in Fig 8, page 25, that the easiest way and what they appear to recommend involves a "DC dedicated grounding electrode", which i'm taking to mean a ground rod to which ONLY the DC side connects to. Is this correct? Because literally everything what i've read, from  chatgpt to google results and various other sources say that nec code requires both the AC AND DC to connect to the same grounding system so that they share the same voltage reference point. What am i missing here?

[ClassicCrazy]

yeah a bit confusing - from manual at various places
I don't have a Rosie but was looking at this to try and figure out if I have my system grounding properly
It seems like it says you only need one 6 gauge ground wire from grounding busbar  to a grounding rod ? As long as all the other interconnecting grounds are properly sized.
The pictorial is a bit confusing since there is a line that is showing the earth ( like in dirt )  but it almost looks like a conductor.
The green dotted line is not a conductor but just drawing a box around all the grounding points.   So if you look at label #8 it shows the actual conductor going to ground rod . Some of the grounds in system pictorial  are in black and some are in green . I didn't study it long enough to determine if that signifies internal grounds and external grounds in system .
Larry

MNROSIE7048 MANUAL

• The Rosie has two separate electrical systems – AC and DC; therefore, each electrical
system is required to be connected to a permanent, common, ground or earth reference

The easiest way to wire your ground system, and one that the NEC allows the smallest size
of GEC, is shown in Figure 10 below.
o Notice the single GEC-DC conductor (#8) – one connection in this entire system to
the ground rod

#8 – #6 AWG. Grounding Electrode Conductor (GEC-DC). Because the grounding system
has a common ground busbar (in the DC panel) and all EGCs, SBJs, and GECs are connected
to that ground busbar, and the system has only one GEC (the GEC-DC) to the ground rod,
the NEC allows for #6 AWG wire

[BlackwaterPark]

yeah a bit confusing - from manual at various places
I don't have a Rosie but was looking at this to try and figure out if I have my system grounding properly
It seems like it says you only need one 6 gauge ground wire from grounding busbar  to a grounding rod ? As long as all the other interconnecting grounds are properly sized.
The pictorial is a bit confusing since there is a line that is showing the earth ( like in dirt )  but it almost looks like a conductor.
The green dotted line is not a conductor but just drawing a box around all the grounding points.   So if you look at label #8 it shows the actual conductor going to ground rod . Some of the grounds in system pictorial  are in black and some are in green . I didn't study it long enough to determine if that signifies internal grounds and external grounds in system .
Larry

MNROSIE7048 MANUAL

• The Rosie has two separate electrical systems – AC and DC; therefore, each electrical
system is required to be connected to a permanent, common, ground or earth reference

The easiest way to wire your ground system, and one that the NEC allows the smallest size
of GEC, is shown in Figure 10 below.
o Notice the single GEC-DC conductor (#8) – one connection in this entire system to
the ground rod

#8 – #6 AWG. Grounding Electrode Conductor (GEC-DC). Because the grounding system
has a common ground busbar (in the DC panel) and all EGCs, SBJs, and GECs are connected
to that ground busbar, and the system has only one GEC (the GEC-DC) to the ground rod,
the NEC allows for #6 AWG wire

I have been getting the strong sense that no one really knows, lol. I turned to AI to get an additional grasp of things, and chatgpt and google AI turn out to be at odds on several points too...but considering both protocols are drawn from the same pool of human knowledge, I suppose it only makes sense that this would be the case.

In particular, I asked chatgpt if I could use a single ground bus bar to ground ALL grounds, both ac and dc, which then run in a single lead to my two newly driven and bonded together earth rods. It said yes, and that was a good and efficient way of doing it.
When I asked google AI the same exact question, it told me most definitely not to do it that way, insisting that the dc and ac should always be on their own ground busses, but in the step by step instructions it then tells me to bond the dc ground bus TO the ac bring bus which then goes out to the rod. So I have to ask... of they are bonded directly anyway, why the hell can't they just share the same bus bar??

so very confusing.