Before terminating any conductors inside Powerwall 3, ensure that the Enable switch is turned OFF to de-energize the system. Confirm lack
of voltage at the AC and PV terminals before proceeding.
Disconnect the AC circuit breaker of
the main service disconnect and secure it against reconnection.
Select the appropriate Powerwall 3 breaker size depending on the
desired power / current output (configured in Tesla One):
Table 1. Maximum Continuous Power /
Current Options
Maximum Continuous
Current
Power Output (AC)
Breaker (Overcurrent
Protection)
48 A On-grid 64 A Off-grid*
11.5 kW On-grid 15.4 kW Off-grid*
80 A*
48 A
11.5 kW (default)
60 A
41.7 A
10 kW
60 A
31.7 A
7.6 kW
40 A
24 A
5.8 kW
30 A
*Powerwall 3 can only provide 15.4 kW
when off-grid and when
there is sufficient solar;
when the system is on-grid, and/or when solar production is insufficient, Powerwall 3 will provide 11.5 kW. If
enabling this feature, Powerwall 3 must be installed with an
80 A breaker and appropriately sized conductors.
(Conduit installations only) Run
conduit as needed and attach the conduit fitting to the Powerwall 3 AC wiring knockout.
Run the AC power conductors and the
equipment grounding conductor from the main panel through the conduit or cable
gland, pulling 24 inches (610 mm) of wiring into the enclosure. Route the conductors
to the appropriate terminals, creating a service loop with the extra wiring (see
Powerwall 3 AC
Wiring for an example of a service loop).
CAUTION
Any wire routing
must be done through the wire management tabs at the top of the enclosure. Do
not route loose wires through the front of the enclosure or over the Tesla Asset
Controller.
Connect the Powerwall 3 equipment grounding
conductor:
Strip the conductor
insulation up to 3/4-inch (19 mm).
Insert the grounding
conductor in an equipment grounding terminal and tighten the screw in the
Earth terminal to 35 in-lb (4 Nm).
Note
It is best practice to connect the ground circuit before making
any AC circuit connections.
Connect the Powerwall 3 AC power conductors to the main
panel or sub panel according to the electrical service type.
Note
Each Powerwall 3 requires a circuit
overcurrent protection device (see table above for required breaker size based
on configured power output). This device serves as the disconnect for Powerwall 3 and must be wired in
accordance with local wiring codes and regulations.
Note
Tesla recommends 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 3 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.
CAUTION
If using a fuse as
the Powerwall 3 overcurrent protection
device, it must be a Class RK1 Fast Acting fuse. Use one of the following fuses
or equivalent:
Fuse Type
Manufacturer
Part Number
60 A Fast-Acting Fuse, Class RK1, >=
250VAC, CLF
Littelfuse
KLNR60
Eaton / Bussmann
KTN-R-60
Mersen / Ferraz Shawmut
A2K60R
40 A Fast-Acting Fuse, Class RK1, >=
250VAC, CLF
Littelfuse
KLNR40
Eaton / Bussmann
KTN-R-40
Mersen / Ferraz Shawmut
A2K40R
30 A Fast-Acting Fuse, Class RK1, >=
250VAC, CLF
Littelfuse
KLNR30
Eaton / Bussmann
KTN-R-30
Mersen / Ferraz Shawmut
A2K350
On the Powerwall 3 product label on the left side
of the unit, use a paint pen, permanent marker, or similar to mark the configured
power / current output.
Note
If required, install a
Power Control System (PCS) field marking label on the side of Powerwall 3 and mark the configured
maximum current output on the label.
If enabling 15.4 kW power when Powerwall 3 is off-grid, use a paint pen, permanent marker, or similar to mark the Powerwall 3 product label on the left side of the unit.
Note
The Powerwall 3 power / current output must be configured as 11.5 kW (48 A) to enable 15.4 kW
power when off-grid.
Clear out any debris that may be
present in the AC wiring terminals.
DANGER
Metal debris like
loose wires or metal shavings could create a high voltage risk when Powerwall is
turned on.
For each AC conductor:
Strip the conductor
insulation up to 7/16-inch (11 mm). Add a ferrule if the conductor is finely
stranded.
Insert the conductor as far
as possible into the terminal.
Warning
Ensure the
conductors are inserted into the round terminals and not the rectangular
slots. Inserting the conductors anywhere other than the round terminals
will result in poor wire termination.
Perform a pull test to ensure
the conductor is fully seated in the terminal. Push the conductor back in
after the pull test.Figure 1. Powerwall 3 AC
Wiring
After installing the AC
conductors and equipment grounding conductor, gather them and secure them
with the provided cable tie as shown above.
Note
If a conductor must be removed from the
connector, insert a cabinet or electronics tip slotted screwdriver (up to 3/16-inch or
4.5 mm) into the actuation shaft to open the terminal. Pull the conductor free, then
remove the screwdriver.Figure 2. Spring Terminal with
Screwdriver and Insert Conductor in Terminal
Required UL 1741 PCS Compliance
Information
Note
The Tesla Powerwall 3 system is certified to UL 1741
PCS for the energy storage system (ESS) operating modes of import and export only.
The installer can select three modes of operation for the system: No Site Export, PV
Only Export, and PV, Battery Export.
NO SITE EXPORT: The
battery and solar will not export beyond the site meter, other than
inadvertent export.
PV ONLY EXPORT: The
battery will not export beyond the site meter, other than inadvertent
export. The export at the site meter will be limited to the export from as
measured by the solar meter.
PV, BATTERY EXPORT:
The battery and solar will export beyond the site meter.
Note
To achieve UL 1741 PCS Import Only
behavior, either PV ONLY
EXPORT or NO SITE
EXPORT must be selected. When the selected Grid Code applies to a region
that requires UL 1741 PCS, such as California UL 1741 SA, the default setting is PV ONLY EXPORT. In the
locally hosted Configuration Interface it is possible to further restrict the system
to NO SITE EXPORT; however
once set, it is not possible to change back to PV ONLY EXPORT. It is not
possible to configure the system to allow BATTERY EXPORT in this
mode.
Note
To achieve UL 1741 PCS Export Only
behavior, PV, BATTERY EXPORT
must be selected and the import rule must be set to charge only from solar (and not
charge from the grid). When the selected Grid Code applies to a region that requires
UL 1741 PCS, such as California UL 1741 SA, the default setting is PV ONLY EXPORT. In the
locally hosted Configuration Interface it is possible to further restrict the system
to NO SITE EXPORT; however
once set, it is not possible to change back to PV ONLY EXPORT or PV, BATTERY EXPORT.
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 3. 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.
NoteIt is best practice to connect the ground circuit before making any AC circuit connections.
NoteIf required, install a Power Control System (PCS) field marking label on the side of Powerwall 3 and mark the configured maximum current output on the label.
