STEP 6: Make AC Power Connections

  1. Disconnect the AC circuit breaker of the main service disconnect and secure it against reconnection.
  2. Connect the Powerwall+ AC power conductors to the overcurrent protection device in the main panel or sub panel according to the electrical service type.
    Informational PurposesAn informational icon, calling your attention
    Note
    Each Powerwall+ requires a 50 A overcurrent protection device. This device serves as the disconnect for Powerwall+ and must be wired in accordance with local wiring codes and regulations.
    Informational PurposesAn informational icon, calling your attention
    Note
    Tesla recommends a 50 A circuit breaker for overcurrent protection, as a circuit breaker can easily be reset by the homeowner if needed. As such, the required overcurrent protection device is referred to as the Powerwall+ circuit breaker throughout this manual. Alternative overcurrent protection devices, such as a fused disconnect, may be used and may result in a poor customer experience if the homeowner cannot reset the system in the unlikely event of a trip.
  3. (Conduit installations only) Run conduit as needed and attach the conduit fitting to the solar assembly AC wiring knockout.
  4. Run the AC power conductors and the equipment grounding conductor from the main panel through the conduit or cable gland and pull them into the solar assembly wiring compartment.
    Informational PurposesAn informational icon, calling your attention
    Note
    See Mount the Solar Assembly for a labeled diagram of the solar assembly knockouts.
  5. Connect the Powerwall+ equipment grounding conductor to an equipment grounding terminal in the solar assembly.
    Figure 1. Equipment Grounding Conductor
  6. For each AC conductor:
    1. Strip the conductor insulation up to 10 mm (0.39 in). If the conductor is finely stranded, provide it with a ferrule.
    2. Insert a cabinet tip or electronics tip slotted screwdriver (up to 3.2 mm or 1/8-inch) into the actuation shaft to open the terminal.
    3. Insert the conductor as far as possible into the terminal and remove the screwdriver from the actuation shaft to close the terminal.
    4. Perform a pull test to ensure the conductor is fully seated in the terminal.
      Warning IconA warning icon, calling your attention to a possibly risky situation
      Warning
      A neutral is required.
      Figure 2. Powerwall+ AC Wiring
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
Inserting conductors into the actuation shafts rather than the terminals can result in fire. Ensure conductors are inserted in the terminals.
  • Ensure the conductors are inserted into the terminal points (round openings) as far as they will go and not into the actuation shafts (rectangular openings)
  • Ensure that the terminal points are allocated to the correct conductors
  • Ensure that the conductors are plugged completely into the terminal points up to the insulation