Install Multiple Powerwall 3 Units

Figure 1. Multi-Powerwall 3 System with up to Four Powerwall 3 Units and up to Three Expansion Units


Leader to Follower Communication	Ethernet (see Prepare Ethernet Wiring with RJ45 Connectors)
Internet Connection for Multiple Units	Option 1: The Leader Powerwall 3 is connected to customer router over Wi-Fi
Internet Connection for Multiple Units	Option 2: Either the first or last Powerwall 3 (can be Leader or Follower) in the chain is connected to customer router via Ethernet Note Only connect the router to a Powerwall 3 at either end of the chain; do not connect it in the middle of the chain (see Connecting Powerwall 3 Units via Ethernet for example diagrams).
Maximum Wire Length Between Units	See Plan Cable Length Between Components
Overcurrent Protection Devices	Each Powerwall 3 requires its own circuit breaker
Splitting PV Production Between Multiple Powerwall 3 Units	Splitting PV production (strings) equally between the Powerwall 3 units is preferred but not required
System Shutdown Switch with Multiple Units	Where a System Shutdown Switch is required, each Powerwall 3 unit must be wired to a dedicated switching pole of the switch. Ensure the installed System Shutdown Switch has enough switching poles for the number of units installed. See STEP 8: Install System Shutdown Switch Where Required for switch requirements and additional information Note For Expansion units, all wiring terminations (including the System Shutdown Switch) are made by the Expansion Harness.

System Shutdown Switch with Multiple Powerwall 3 Units

The System Shutdown Switch initiates Rapid Shutdown (RSD) (see STEP 8: Install System Shutdown Switch Where Required for details). Where a System Shutdown Switch is required, each Powerwall 3 must be wired to a dedicated switching pole of the switch. Ensure the installed System Shutdown Switch has enough switching poles for the number of units installed.

Note

As depicted in the system diagram above, Expansion units are not connected to the System Shutdown Switch. They are connected to Powerwall 3 via the Expansion Harness, and they will also shut down when the System Shutdown Switch is pushed.

Figure 2. 4-Pole System Shutdown Switch with Four Powerwall 3 Units

In the event multiple System Shutdown Switches are required to accommodate the number of Powerwall 3 units installed, simply install multiple switches, placing them physically near each other and following all local codes and requirements.

Figure 3. Two 3-Pole System Shutdown Switches with Four Powerwall 3 Units

Connecting Powerwall 3 Units via Ethernet

All Powerwall 3 units must be connected via Ethernet. The units can be connected in any order, so long as each unit is connected to at least one other unit.

Figure 4. Option 1: Leader Powerwall 3 Connected to Customer Router via Wi-Fi (Leader at Start of Chain)

Figure 5. Option 2: Leader Powerwall 3 Connected to Customer Router via Wi-Fi (Leader in Middle of Chain)

Figure 6. Option 3: Leader Powerwall 3 Connected to Customer Router via Ethernet

Note

If connecting the system to the customer router via Ethernet, connect the router to either the first or last Powerwall 3 in the chain. Do NOT connect the router in the middle of the chain.

Commissioning Multi-Powerwall 3 Systems

For instructions to commission a multi-Powerwall 3 system, as well as for troubleshooting steps for common issues, see the Powerwall 3 Device Setup Guide.