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
Gateway
3 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 Gateway 3 is designated as a Follower unit |
Leader to Follower Communication | Ethernet (see Prepare Ethernet Wiring with RJ45 Connectors) |
Internet Connection for Multiple Units |
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 |
![](GUID-14178F81-252C-4676-B1D5-A8D763C01C6D-online-en-US.png)
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.
![](GUID-C24D4B6D-748D-4341-9365-D1B92018A17B-online-en-US.png)
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.
![](GUID-7CFACA15-8570-4C78-A194-EA798884BC97-online-en-US.png)
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.
![](GUID-AD0B3627-B9DE-4C27-98D1-0632765D065D-online-en-US.png)
![](GUID-9998897B-BB01-4B0C-9019-4DE77F4C91CD-online-en-US.png)
![](GUID-46F6BD6D-B1BF-46A6-A004-776748A3551D-online-en-US.png)
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.