Powerwall 3 Expansion Units

Figure 1. Powerwall 3 with Expansion Unit Mounted Side-by-Side
1 Powerwall 3
2 Powerwall 3 Expansion
3 Expansion Harness
Expansion units offer additional storage for Powerwall 3 systems. Key points about Expansion units include:
  • Function: An Expansion unit does not include an inverter; it is only additional storage (kWh)
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    Note
    Expansion units do not have an LED. Wall-mounted Expansion units are installed with the same glass front cover as Powerwall 3, but the logo on the front will never light because there is no LED in the unit.
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    Note
    Expansion units are not field serviceable.
  • Dimensions: The Expansion enclosure is the same height and width as Powerwall 3, but is 1 inch (25 mm) slimmer than Powerwall 3 (see diagram)
  • Mounting: Expansion units can be mounted individually
  • Expansion Connection: Expansion units can only be connected to Powerwall 3 or other Expansion units via the Expansion Harness. Each unit (Powerwall 3 and Expansion) has (2) Expansion ports, one on each side of the enclosure
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    Note
    The Expansion units are electrically paralleled with a Powerwall 3.
  • System Size: Up to (3) Expansion units can be connected to the Leader Powerwall 3
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    Note
    Expansion units can only be connected to the Leader Powerwall 3 (the unit connected to the Backup Gateway 2 / Backup Switch / Gateway 3 via 12V / CAN wiring; a system can only have (1) Leader). Expansion units connected to Follower Powerwall 3 units (any Powerwall 3 other than the Leader) will not function. The total maximum system size is (7) units - up to (4) Powerwall 3 units with up to (3) Expansion units.
  • Compatible Powerwall 3 Versions: Powerwall 3 units with Tesla P/N 1707000-xx-J or greater are compatible with Expansion units
  • Flexibility:
    • The Expansion Harness can be plugged in on either side of a Powerwall 3 or an Expansion unit
    • Powerwall 3 can be installed at either end of a chain of Expansion units
    • Powerwall 3 can be installed in the middle of a chain of Expansion units
Figure 2. Powerwall 3 Dimensions Compared with Expansion Unit Dimensions
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Note
Powerwall 3 and the Expansion unit are both 43.5 in (1105 mm) tall when the glass front cover is installed.