Daisy Chaining Multiple Wall Connectors

Tesla recommends daisy chaining Wall Connectors at sites with more than two Wall Connectors to improve installation costs wherever full power is not always needed. Implementing this installation process leads to simplification of site design, fewer materials used, and overall reduced costs. This is particularly effective whenever two Wall Connectors are mounted on a single pedestal or next to each other on a wall.

The Universal Wall Connector supports daisy chaining of multiple Wall Connectors on a single branch circuit by feeding additional Wall Connectors from the second set of terminals. In this arrangement, the wire box of a Wall Connector can be used as a pass-through supply to the subsequent Wall Connector. Daisy chaining is currently only supported on the Universal Wall Connector.

The maximum current rating for a daisy chain is 48A, fed by a 60A circuit breaker. All Wall Connectors in a daisy chain must be configured as a single group power management unit with a network limit of no more than 48A. The current rating can be configured in the Tesla One app during the Commissioning Process.

All power conductors in the daisy chain must also be sized to carry the full network limit current. For example, if the group power management unit current limit is set to 48A, all conductors in the daisy chain must be sized for 48A continuous.

The number of Wall Connectors in a daisy chain should be selected to ensure any minimum required power levels are maintained. Available current is redistributed equally among all connected vehicles whenever a new vehicle is plugged or unplugged from a connector.

Table 1.
	1 Wall Connector		2 Daisy chained Wall Connectors		3 Daisy Chained Wall Connectors		4 Daisy Chained Wall Connectors
	240V	208V	240V	208V	240V	208V	240V	208V
48A	11.5 kW	9.9 kW	5.7 kW	4.9 kW	3.8 kW	3.2 kW	2.9 kW	2.5 kW
32 A Group Limit	7.9 kW	6.7 kW	3.8 kW	3.3 kW	2.5 kW	2.2 kW	Not Recommended
24 A Group Limit	5.7 kW	4.9 kW	2.9 kW	2.5 kW	Not Recommended		Not Recommended

Each Universal Wall Connector has three bi-directional terminals in the wirebox: L1, L2, and GND. Form a daisy-chained network by connecting the cables from each terminal of the Wall Connector to the corresponding terminal of another wall connector as shown below.

Planning the installation:

Choose a breaker appropriate for the location and circuit size.
Choose the right amperage based on the application of the site.
See the recommended amperage based on the power output and the application of the site.

Table 2.
Expected Park Time (hours)	Examples	Minimum amperage per wall connector at 100% utilization	Power output at 240 volts (kW)	Power output at 208 volts (kW)
>8+	Overnight parking, airport	12 A min	2.75 kW	2.4 kW
4-8	Long term parking, overnight parking	24 A min	5.7 kW	4.9 kW
	Workplace, hospitality
1-3	Shopping and dining	48 A min	11.5 kW	10 kW

For a 6 Wall Connector site, a 225 A breaker panel is preferred. For a single-phase implementation, see figure below. For a 12 Wall Connector site, a 400 A breaker panel is preferred.

To implement daisy chaining in a three-phase system, daisy-chained groups of Wall Connectors should be distributed as evenly as possible among phase pairs as shown in the figure below.

Examples of Daisy Chain Using a Pedestal

If the Wall Connectors are mounted on a pedestal, drill two openings at the rear entry locations with a 1-1/8 in (29 mm) step bit. Route the wiring through these openings and through the pedestal to make the connections.

Examples of Daisy Chain on a Wall Mounted Site

If the Wall Connectors are mounted on a wall, you can utilize either the top or bottom openings and route the wires through a 1-inch conduit.