Make Powerwall 3 Wiring Connections

Make Powerwall 3 AC Power Connections

Connect Powerwall 3 to the appropriate breaker size depending on the desired power / current output (configured in Tesla One):
Table 1. Maximum Continuous Power / Current Options
Maximum Continuous CurrentPower 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 A11.5 kW (default) 60 A
41.7 A10 kW 60 A
31.7 A7.6 kW 40 A
24 A5.8 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.

1 Ground terminals: 12-4 AWG (4-25 mm2), torque to 35 in-lb with Torx T20
2 N / L2 / L1: 10-4 AWG (6-25 mm2), use up to 4.5 mm (3/16 inch) cabinet / electronics tip screwdriver
3 Gather conductors in provided cable tie
4 Leave a service loop
Warning IconA warning icon, calling your attention to a possibly risky situation
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 TypeManufacturerPart Number
80 A Fast-Acting Fuse, Class RK1, >= 250VAC, CLFLittelfuseKLNR080
Eaton / BussmannKTN-R-80
Mersen / Ferraz ShawmutA2K80R
60 A Fast-Acting Fuse, Class RK1, >= 250VAC, CLFLittelfuseKLNR60
Eaton / BussmannKTN-R-60
Mersen / Ferraz ShawmutA2K60R
40 A Fast-Acting Fuse, Class RK1, >= 250VAC, CLFLittelfuseKLNR40
Eaton / BussmannKTN-R-40
Mersen / Ferraz ShawmutA2K40R
30 A Fast-Acting Fuse, Class RK1, >= 250VAC, CLFLittelfuseKLNR30
Eaton / BussmannKTN-R-30
Mersen / Ferraz ShawmutA2K350

Make Powerwall 3 PV Power Connections

Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
Turn the Powerwall 3 Enable switch OFF before doing any wiring.
1 Ground terminals: 12-4 AWG (4-25 mm2), torque to 35 in-lb with Torx T20
2 MPPT Positive PV inputs: 10-6 AWG (6-16 mm2) Use up to 4.5 mm (3/16 inch) cabinet / electronics tip screwdriver
3 MPPT Negative PV inputs: 10-6 AWG (6-16 mm2)
4 Gather conductors in provided cable tie
5 Leave a service loop
Important Notes on Installing MPPT Jumpers:
  • The jumpers provided in the Powerwall 3 accessory bag can only be used with the Powerwall 3 model they shipped with:
    Powerwall 3 Part NumbersJumper Part NumberJumper Image
    1707000-11-L or 170700-21-L2009322-xx-y
    All other Powerwall 3 part numbers1784893-xx-y
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    These jumpers are not interchangeable. Only install the jumpers that ship with the unit.
  • Jumpers can be used when IMP > 13A. Use jumpers to allow a single MPPT to intake strings with a total IMP up to 26A
  • Land the combined circuit (2 strings in parallel = 1 circuit) or string with IMP greater than 13A in the terminal and connect the jumper from:
    • MPPT 1 to MPPT 2
    • MPPT 5 to MPPT 6
  • MPPT PV inputs 3 and 4 cannot be combined and are closed from the factory
  • Do not use jumpers on Solar Roof jobs - you cannot parallel more than two strings so combined circuit IMP will always be less than 13A DC
  • Ensure each jumper is fully seated in the connector!
Figure 1. Example PV Wiring Configuration: Up to (6X) Independent Strings where IMP of Each String < 13A
Figure 2. Example PV Wiring Configuration: Up to (6X) Pairs of Combined Strings where IMP of Each Combined Circuit > 13A (Jumpers Required)

Connect Powerwall 3 to the Backup Switch / Backup Gateway 2 / Gateway 3

1 CN- (CAN LO): 24-16 AWG (0.2-1.5 mm2) Use up to 3 mm (3/32 inch) cabinet / electronics tip screwdriver
CN+ (CAN HI): 24-16 AWG (0.2-1.5 mm2)
2 GND: 24-16 AWG (0.2-1.5 mm2)*
12V+: 24-16 AWG (0.2-1.5 mm2)*
3 Leave a service loop

*18 AWG is the recommended minimum wire gauge due to potential voltage drop on long wire runs.

Informational PurposesAn informational icon, calling your attention
Note
CN- and CN+ must be twisted pair.
Informational PurposesAn informational icon, calling your attention
Note
The wire order for Backup Switch / Backup Gateway 2/ Gateway 3 is not the same as the wire order for Powerwall 3.

Install System Shutdown Switch Where Required

Warning IconA warning icon, calling your attention to a possibly risky situation
CAUTION
The System Shutdown Switch must be connected to Powerwall 3. Do not connect it to the Backup Gateway 2 as it will not work.
1 Rapid Shutdown IN: 24-16 AWG (0.2-1.5 mm2) Use up to 3 mm (3/32 inch) cabinet / electronics tip screwdriver
2 Rapid Shutdown OUT: 24-16 AWG (0.2-1.5 mm2)
3 Remove RSD jumper when installing System Shutdown Switch; otherwise, leave installed
4 Leave a service loop
5 Connect the RSD wiring to a suitable DC switch (see the Powerwall 3 with Backup Gateway 2, Backup Switch, or Gateway 3 installation manual for full details)
Informational PurposesAn informational icon, calling your attention
Note
See Multi-Powerwall 3 Installations for instructions to connect multiple Powerwall 3 units to a System Shutdown Switch.

Install Ferrite Cores

  • (1) large clamp-on ferrite core for the AC conductors
  • (1) small clamp-on ferrite core for the TACO low voltage harness
Warning IconA warning icon, calling your attention to a possibly risky situation
CAUTION
Ferrite cores are fragile; handle with caution.
Informational PurposesAn informational icon, calling your attention
Note
Ground wires do not need to be included in the ferrite cores.

Important Notes on Wire Routing

Figure 3. Good Wiring Example: AC Wiring Routed from Left, PV Wiring Routed from Right
1
  • AC is routed from left with service loop
  • AC wires are secured with a cable tie
2
  • PV is routed from right with service loop
  • PV wires are secured with a cable tie
Figure 4. Good Wiring Example: AC Wiring Routed from Right, PV Wiring Routed from Left
1
  • AC is routed from right, crossing the enclosure in the dedicated wiring space
  • AC wiring has a service loop
  • AC wires are secured with a cable tie
2
  • PV is routed from left, crossing the enclosure in the dedicated wiring space
  • PV wiring has a service loop
  • PV wires are secured with a cable tie
Figure 5. Bad Wiring Example: AC Wiring Blocking Front Cover
1 AC wires are routed across the front of the enclosure which would prevent the front cover from being installed