Install Expansion Units with Powerwall 3

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 (see 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
  • 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.

Expansion Harness

The Tesla Expansion Harness is a non-metallic sheathed hard-use appliance cable assembly rated for indoor or outdoor installations. The cable uses an extruded TPE jacket, is moisture, flame and UV resistant, and has a temperature rating of -40°C to 105°C. The harness is a listed component of the Powerwall 3 and Expansion UL 9540 certifications and is required for electrical connection between the ESS units. Field wiring of the Expansion unit, alteration of the Expansion Harness (e.g. splicing), and/or routing the Expansion Harness through a wall or partition are prohibited by the listing.

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Warning
Do not modify the Expansion Harness in any way. Doing so would result in product damage that could void the product warranty.
1 Sealing gasket
2 DC jaws
3 Communication ports
4 Grounding spikes (4)
5 Harness screw (T40)
6 Etched part number
7 Harness length identifier in part number
Table 1. Expansion Harness Options
Expansion Harness* Expansion Harness Part Number Color ID
1 ft Harness Tesla P/N 1875157-05-x N/A
5 ft Harness Tesla P/N 1875157-20-x Blue
7 ft Harness Tesla P/N 1875157-25-x White
9 ft Harness Tesla P/N 1875157-30-x Yellow
12 ft Harness Tesla P/N 1875157-40-x Green

*Harness length in feet is approximate.

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Note
Expansion harnesses can be plugged into both the left and right ports on the Leader Powerwall 3. The maximum combined length of Expansion harnesses plugged into the left OR right port is 12 ft. See Wall Mount an Expansion Unit for a table of all harness combinations that, when added together, are less than or equal to 12 ft.
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CAUTION
The Expansion Harness ships in protective packaging from the factory.
  • Do not remove the protective packaging until ready to plug the Expansion Harness into the Expansion port
  • If the Expansion Harness is unplugged and needs to be set aside, place it back in the protective packaging
  • If the Expansion Harness is dropped or otherwise damaged, or if dust / debris enter its DC jaws and/or communication ports, do not use that Expansion Harness. Recycle it and use a new Expansion Harness

Expansion Mounting Configurations

Wall-Mounted Configuration
Kit P/N Tesla P/N 1978069-00-A
Included Accessories
  • Mounting bracket (Tesla P/N 1738120-xx-y)
  • Glass front cover (Tesla P/N 1763418-xx-y)
  • (6) M6 fasteners for front cover (Tesla P/N 1857363-00-A)
  • (9) Bridgeport US-6171 straps for Expansion Harness cable management (Tesla P/N 1730711-00-A)
Expansion Harness (ordered separately, see Expansion Harness for part number location) 1 ft Harness (Tesla P/N 1875157-05-x)
5 ft Harness (Blue tag) (Tesla P/N 1875157-20-x)
7 ft Harness (White tag) (Tesla P/N 1875157-25-x)
9 ft Harness (Yellow tag) (Tesla P/N 1875157-30-x)
12 ft Harness (Green tag) (Tesla P/N 1875157-40-x)
Expansion Harness Straps Bridgeport US-6171 strap (Tesla P/N 1730711-00-A, some are included in accessory bag but additional straps can be ordered)
Installation Instructions Wall Mount an Expansion Unit

*Expansion harnesses can be plugged into both the left and right ports on the Leader Powerwall 3. The maximum combined length of Expansion harnesses plugged into the left OR right port is 12 ft. See Wall Mount an Expansion Unit for a table of all harness combinations that, when added together, are less than or equal to 12 ft.