26/09/2023 12:41:22

Connect Powerwall to the Backup Gateway

Note

Refer to Appendix B: Wiring Reference for wiring specifications.

Depending on local requirements, Powerwall wiring can be installed through conduit or through a cable gland. Refer to local codes to determine wiring requirements.

(Conduit installations only) Run conduit as needed and attach the conduit fitting to the inlet of the wiring compartment. The wiring compartment inlet accepts a standard 1-inch conduit fitting.

Note
Ensure that all conduit joints and outlets have smooth edges so that wiring is not damaged as it is run through the conduit.
Run the 4-conductor communication cable, the AC power conductors, and equipment grounding conductor from the Backup Gateway through the conduit or cable gland and pull them into the Powerwall wiring compartment.
At the Powerwall, strip the ends of the AC conductors and attach them to the corresponding leads on the AC power harness.
Plug the AC power harness into the AC connector in the Powerwall wiring compartment. Ensure that the connector clicks into place.

Figure 1. Powerwall 2 AC Power Harness Connection
On each end of the 4-conductor communication cable, strip and insert the wires into the provided 4-pin connectors (see figure below). On the Powerwall side, use the black connector provided in the accessory bag. On the Backup Gateway side, use the connector that came plugged into the corresponding connector socket in the Backup Gateway.

Figure 2. Communication Connector Wiring
On the Backup Gateway side of the 4-conductor communication cable, cut back the drain wire. The drain wire should be terminated at the Powerwall chassis Earth terminal only.
On the Backup Gateway side, plug the 4-pin connector into the 4-pin socket labelled “Powerwall”. Tighten screws on the connector.

Note
See Backup Gateway 2 Communication Wiring for diagrams and wiring specifications.
On the Powerwall side, plug the 4-pin connector into the bottom 4-pin socket (labeled “IN”) in the Powerwall wiring compartment.
Plug the provided 4-pin connector with the terminating 120-Ohm resistor into the top 4-pin socket (labeled “OUT”) in the Powerwall wiring compartment. (In multi-Powerwall installations, use this connector only in the last Powerwall in the chain.)
On the Powerwall side, strip the end of the equipment grounding conductor and wrap the communication cable drain wire around the grounding conductor lead.
Insert the grounding conductor and drain wire in the Powerwall chassis Earth terminal (see figure below). The Earth terminal is identified with the following symbol: . Tighten the screw in the Earth terminal to 4.5 Nm.

Figure 3. Powerwall Earth / Ground and Communication Connections with a Terminating Resistor

Note
The Tesla Powerwall system supports ESS Operating Mode of Import Only, where it will not export active power from the battery to the Area EPS. The installer and the customer can select two standard modes of operation for the Powerwall: Self-powered and Time-Based Control. Both modes of operations operate within the constraint of the Import Only ESS Operating Mode.

Note
This system is equipped with a power control system (PCS) which is suitably rated to provide branch circuit overcurrent protection. The controlled current setting shall not exceed the rating of any controlled busbars or conductor ampacity.

Note
The PCS controlled current setting for each PCS controlled conductor or bus bar shall be indicated with a field applied marking label on the conductor or in close proximity to the busbar.

Figure 4. PCS Field Marking Label

Warning
Only qualified personnel shall be permitted to set or change the setting of the maximum operating current of the PCS. The maximum PCS operating current setting shall not exceed the busbar rating or conductor ampacity of any PCS controlled busbar or conductor.

Warning
Configuration of power control settings system or changes to settings shall be made by qualified personnel only. Incorrect configuration or setting of the power control settings may result in unsafe conditions.

Note
The maximum operating currents in controlled busbars or conductors are limited by the settings of the power control system (PCS) and may be lower than the sum of the currents of the connected controlled power sources. The settings of the PCS controlled currents may be used for calculation of the design currents used in the relevant sections of NEC Article 690 and 705.

Note
Maximum PCS Controlled Current setting: 200 A.