newtosolar11
New Member
I plan on having an electrician make a subpanel with some breakers moved over. The 12000XP would use PV and Battery to power these loads most of the time at 12000W/240V/50A (L1-L2) or 6000W/120V/50A (L1-N, L2-N). If the 12000XP cannot power the subpanel in case amp draw is too high or batteries are depleted, it will go into grid bypass mode, which can pass through 100 amps to the subpanel from the main panel. No transfer switch as the 12000XP will function as the transfer switch. Excess power will go to waste and not be sold back to the grid as that's too much extra paperwork for very little gain (PG&E, California).
Grounding Question
The 12000XP can either have N-G bond enabled or disabled but cannot be dynamic. Assume that the 12000XP's internal N-G bond is always disabled. The subpanel N-G is also never connected.
"N-N" means neutral-neutral wire and "G-G" means ground-ground wire. "N-G" means neutral-ground wire bond.
Which configuration is correct?
Configuration A
Configuration B (difference from A emboldened)
Configuration C (differences from A emboldened)
I've seen some YouTube videos and read as many manuals as I can. I'm not sure I've seen it explained anywhere, so help would be appreciated!
Bonus question: Can I connect an LED to the metal frame of the 12000XP in order to see if the case has been energized due to an unresolved ground fault? I know it has its own indicator light, but just to be safe.
Grounding Question
The 12000XP can either have N-G bond enabled or disabled but cannot be dynamic. Assume that the 12000XP's internal N-G bond is always disabled. The subpanel N-G is also never connected.
"N-N" means neutral-neutral wire and "G-G" means ground-ground wire. "N-G" means neutral-ground wire bond.
Which configuration is correct?
Configuration A
- Between Subpanel and Main Panel: N-N and G-G
- Between 12000XP and Subpanel: N-N and G-G
- Between 12000XP and Main Panel: does not have N-N or G-G
- When the 12000XP is in grid bypass mode, pulling 100A from the Main Panel and sending it to the Subpanel, the Subpanel to Main Panel N-N and G-G connection will function as the 12000XP's connection to the Main Panel's neutral and ground.
- When the 12000XP is in Battery/PV mode, the Subpanel to Main Panel N-N is nonfunctional because there is no power coming from the Main Panel. In Battery/PV mode, N-N between the 12000XP and Subpanel function to complete the circuit.
- In either grid bypass or Battery/PV modes, if the 12000XP or Batteries have a ground fault, excess power will travel from the 12000XP to the Subpanel through its G-G bond. Then that excess power will travel from the Subpanel to the Main panel through its G-G bond.
Configuration B (difference from A emboldened)
- Between Subpanel and Main Panel: N-N and G-G
- Between 12000XP and Subpanel: N-N and G-G
- Between 12000XP and Main Panel: N-N and G-G
Configuration C (differences from A emboldened)
- Between Subpanel and Main Panel: does not have N-N and G-G
- Between 12000XP and Subpanel: N-N and G-G
- Between 12000XP and Main Panel: N-N and G-G
I've seen some YouTube videos and read as many manuals as I can. I'm not sure I've seen it explained anywhere, so help would be appreciated!
Bonus question: Can I connect an LED to the metal frame of the 12000XP in order to see if the case has been energized due to an unresolved ground fault? I know it has its own indicator light, but just to be safe.