2024-11-26

Install Powerwall and Generation Breakers in the Backup Gateway

  1. Install the Powerwall and generation circuit breakers on the DIN rail, and connect using an appropriately rated DIN rail circuit breaker busbar.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    Warning
    All Powerwalls in the system must be installed on the 'Backup' ('Home') side of the Backup Gateway's relay.
  2. Connect the line conductors from the bussed generation circuit breakers to the Backup Gateway’s Backup terminals (see the figure in Residual Current Devices (RCDs) / Residual Current Circuit Breakers with Overcurrent Protection (RCBOs)). These conductors must be appropriately rated to carry the current of the main supply fuse.
  3. Connect Neutral and Protective Earth conductors from Powerwall and generation circuits to the Neutral and Protective Earth wiring bars, respectively.
  4. Connect the Powerwall AC power conductors to its breaker in the Backup Gateway.

    Design Considerations

    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    If installing greater than 100 A of generation, a separate overcurrent protection (such as a generation sub-board) is required to maintain maximum current rating of the Backup Gateway.

    The Backup Gateway 2 can accommodate up to nine (9) 1-pole MCB slots on the DIN rail for generation circuits and fuse carrier(s).

    The Powerwall connection to the Backup Gateway requires a circuit breaker. This breaker serves as circuit protection for the Powerwall, and must be wired in accordance with local wiring codes and regulations. Refer to the Required Supplies section to select the appropriate Powerwall 3 breaker size depending on the desired power output (configured in the Tesla One app during commissioning).

    Some regions may require use of an external Residual Current Devices (RCD) / Residual Current Circuit Breakers with Overcurrent Protection (RCBO) on the solar PV inverter and/or Powerwall circuits. Refer to Residual Current Devices (RCDs) / Residual Current Circuit Breakers with Overcurrent Protection (RCBOs) for additional guidance.

    Informational PurposesAn informational icon, calling your attention
    Note
    Powerwall is a current-limited device. In event of a fault of negligible impedance between a live conductor and protective conductor or exposed-conductive-part while operating off-grid, Powerwall senses the corresponding voltage change and immediately shuts off. Voltage is reduced to a safe level within the required time per IEC 60364-4-41 / BS EN 7671 section 419. Thus, an RCD / RCBO is not required at the AC output terminals of the Powerwall to meet requirements of automatic disconnection.