Add Follower Powerwall 3 and/or Expansion Units

Designate the Powerwall 3 Leader

The Powerwall 3 connected to the Backup Gateway over 12V/CAN wiring is designated as the Leader Powerwall 3. Before connecting to any Powerwall 3, note which unit is the Leader; any other unit(s) are Followers.

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Note
As described in the following procedures, only commission and register the Leader Powerwall 3. Do not attempt to commission or register any Follower units.
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Note
As shown below, Expansion units must be connected to the Leader Powerwall 3. They will not function if connected to a Follower unit.

Connect to Leader and "Scan for Devices" to Pair Follower(s) and/or Expansion Units

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Note
Before you pair a Follower unit, ensure that each Powerwall 3 is on software version 24.20 or later. See Launch Device Setup in Tesla One and Update Powerwall 3 Software to find the software version. If a Powerwall 3 is on an earlier version, update the software, and do not perform any other commissioning steps on any Follower unit.
  1. Connect to the Leader Powerwall 3 in the Tesla One Device Setup interface. See Launch Device Setup in Tesla One for instructions.
  2. On the landing page, select Stop System.
  3. Select System > Scan for Devices.
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    Note
    Confirm all Follower units appear before proceeding. A green checkmark indicates the device has successfully paired.
  4. If the system has Expansion units:
    1. Confirm the Expansion units appear in the Devices tab.
    2. Confirm the Expansion serial numbers in Tesla One match those on the installed units (found on left side of unit).
    3. Select Update Expansions.
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      Note
      It should take a few minutes to update each Expansion.
    4. Confirm the aggregate Battery State of Charge (SOC) for Powerwall 3 and Expansion units is healthy (>10%).
      • If the SOC is <10%, ensure Device Setup has been successfully completed. If Device Setup could not be completed, turn the Powerwall 3 switch OFF and leave the Powerwall 3 breaker closed to enable charging.
  5. While connected to the Leader Powerwall 3, return to the landing page and select Start System.
  6. Wait for all device firmware updates to complete (to view progress, select System then review the Devices tab).
  7. If the system includes Expansion units, Calibration will automatically begin, with the system calibrating (1) Expansion unit at a time. Within approximately one minute, Tesla One will display Calibration in Progress.
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    Note
    Expansion units have an internal relay that is initially opened. To close the relay, the voltage of each Expansion unit must be the same as the other units. The calibration process charges OR discharges the Powerwall 3 to match voltages across the units.
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    Note
    No installer action is necessary during calibration; as it may take from a few minutes to a few hours, it is not necessary to remain at the site until calibration is completed.
  8. Confirm there are no alerts and both solar and battery are operating for all Powerwall 3 units.
  9. Perform Backup Test to confirm the system is operating as expected. See Perform Backup Test for instructions.
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    Note
    The Backup Test is required and can be performed during calibration.
  10. Select Registration and register the system to the customer.
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    Note
    This will register the Leader Powerwall 3 and any Follower(s) to the customer.