Appendix G: Installations with Multiple Powerwall 3 Units


Maximum Number of Powerwall 3 Units	Up to (4X)Powerwall 3 units Note The maximum number of Powerwall 3 units per installation may vary by market.
Overcurrent Protection Devices	Each Powerwall 3 requires its own 60 A circuit breaker
Site Leader	The Powerwall 3 connected to the Backup Switch is designated as the Leader Powerwall 3 Note The system is commissioned by connecting to the Leader Powerwall 3.
Follower Unit	Any Powerwall 3not connected to the Backup Switch is designated as a Follower unit
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 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).
Allowable Mounting Configuration	Side-by-side (front-to-back stacking is not supported for multiple Powerwall 3 units)
Maximum Wire Length Between Units	See Plan Cable Length Between Components
Splitting PV Production Between Multiple Units	Split PV production [strings] equally between the Powerwall 3 units
System Shutdown Switch with Multiple Units	Where a single System Shutdown Switch is required, each 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

Figure 1. Multi-Powerwall 3 System with Backup Gateway 2

System Shutdown Switch with Multiple Powerwall 3 Units

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.

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. Example 1: Leader Powerwall 3 at Start of Chain, Connected to Customer Router via Wi-Fi

Figure 5. Example 2: Leader Powerwall 3 at Start of Chain, Connected to Customer Router via Ethernet

Figure 6. Example 3: Leader Powerwall 3 in Middle of Chain, Connected to Customer Router via Wi-Fi

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.