Verify Neutral-Earth Bonding Scheme and Install Earthing Rod

Proper earth connection and Neutral-to-Physical Earth (N-PE) bonding is required for safe operation of the Powerwall system and for compliance with local code requirements. The correct Neutral-to-Earth bonding scheme must be maintained even when the system is disconnected from the grid.

To meet local regulations, the Neutral must be disconnected in off-grid operation. For typical supply arrangements, disconnecting the Neutral means that the N-PE bond will be lost when off-grid. With the Switched Earth (N-PE) Jumper installed, the Backup Gateway's internal contactor will re-bond Neutral to Earth locally when the Line and Neutral contacts are open.

Figure 1. Neutral Re-bonded to Earth During Off-Grid Operation with Switched Earth (N-PE) Jumper
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
To ensure safe operation, a local earth connection must be present on the site such as by earth rod or ground electrode. During a grid fault it cannot be assumed that the DNO's Earth or Protective Earth Neutral (PEN) conductors are intact. Installation of earth rod must comply with local codes.
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
Incorrect earthing or Neutral-to-Protective Earth (N-PE) bonding presents a risk of electrical shock or damage to equipment. Verify that the system is properly earthed and that the correct Neutral-to-Earth bonding scheme meets regional and local requirements.

See Situations in Which Powerwall 3 Stops Grid Forming for additional information on earthing and fault protection.