Which Wall Connector?
Tesla sells two versions. The standard Wall Connector has a NACS plug and works only with Tesla vehicles[9]. The Universal Wall Connector has both NACS and J1772 plugs and charges Tesla and other electric vehicles[9]; its J1772 side is an adapter on the handle, which docks into the unit[7].
The circuit is the same for both. Tesla's installation manuals for the two give the same breaker-to-output table[1][2]. If anyone in the household drives a non-Tesla EV, or might, the Universal is the one we usually recommend, because its NACS and J1772 connections cover more vehicles.
The breaker sets the maximum
The Wall Connector adapts to the circuit it is given. Tesla's installation manual pairs each breaker size with a maximum output[1]:
- 60-amp breaker: up to 48 amps, 11.5 kW at 240 volts
- 50-amp breaker: up to 40 amps, 9.6 kW
- 40-amp breaker: up to 32 amps, 7.6 kW
- 30-amp breaker: up to 24 amps, 5.7 kW
- 20-amp breaker: up to 16 amps, 3.8 kW
- 15-amp breaker: up to 12 amps, 2.8 kW
For maximum output Tesla calls for a standard double-pole 60-amp breaker, and where the electrical supply cannot support that, a lower setting is selected[1]. The breaker size is programmed into the unit when it is commissioned[1].
The car decides the rest. Tesla notes that some Tesla vehicles may draw less current than the maximum output, and that the actual charging rate depends on the Wall Connector's output and the vehicle's onboard charger[1]. A car limited to 32 amps cannot draw more than 32 from a 60-amp circuit.
A lower setting protects the branch circuit, but it does less for the panel's service calculation than people expect. Whether your panel can carry the circuit at all is its own question, covered step by step in Will my panel support an EV charger?
What the circuit looks like
- HARDWIRED. Tesla's manual says to hardwire the branch circuit and not to install cord-and-plug connections[1]. There is no plug-in version to put on an outlet.
- SIZED AS A CONTINUOUS LOAD. The County's EV charger checklist asks for the charging circuit to be sized for a continuous load at 125%, citing California Electrical Code 625.41[10]. That is where the 60-amp breaker for a 48-amp output comes from.
- COPPER, MATCHED TO THE BREAKER. For the full 48-amp output on a 60-amp breaker, Tesla specifies minimum 4 AWG, 90°C THWN-2 copper with a 60°C-rated breaker, or minimum 6 AWG, 90°C THWN-2 copper with a 75°C-rated breaker. Below that, conductors follow the local electrical code for the chosen breaker[1].
- GROUNDED, AND TESTED. The unit needs a ground path back to the main earthing point, and it faults during its ground assurance test without one[1].
- NO EXTRA DISCONNECT. Tesla says external disconnect switches are neither required nor recommended for the Wall Connector[1].
Where it can go
The Wall Connector is rated for indoor or outdoor mounting: its enclosure is Type 3R, and Tesla lists an operating range of -22°F to 122°F[3]. Outdoors, the wiring enters through watertight fittings[1].
The cable is 24 feet[3], so check that it reaches the charge port from the proposed spot wherever the car actually parks, including a second car's spot if there is one.
Tesla's Gen 3 manual calls for a flat vertical surface such as a wall or a pedestal, and lists a maximum height of 60 inches, about 45 inches recommended, and minimums of 24 inches outdoors and 18 inches indoors[4]. For the Universal, we mount to its own manual.
A detached garage or a long run back to the panel changes the circuit, not the charger. Longer runs can need heavier wire, and sometimes a subpanel at the outbuilding is the cleaner answer.
Setup: the step people don't see
A Wall Connector is not finished when it is on the wall. It is commissioned in Tesla One, where the installer logs in with a Tesla Partner Portal account, then selects the installation settings, the country and the breaker size[5]. Tesla's support page says commissioning, connecting to Wi-Fi and registering the unit to its owner are all required for it to work as expected[11].
It connects to home Wi-Fi on 2.4 GHz networks only[6]. If your router only broadcasts on 5 GHz, or the signal does not reach the parking spot, that is worth sorting out before install day.
We commission, connect and register on the day, and set the breaker size to match the circuit we installed.
Two EVs, one panel
Tesla's power sharing lets up to six Wall Connectors at one site share the site's available power over unit-to-unit Wi-Fi[8], and Tesla says it can enable the safe use of a single branch circuit for several units[1]. For a two-EV household that may mean two chargers sharing one supply instead of two full circuits, which matters on a panel without room for both. Shared units split the available current rather than each getting the full output.
Tesla's instructions are not consistent about which models can share one branch circuit, so the wiring for shared units is checked against Tesla's current instructions for the exact models before it is quoted.
Permits in Santa Cruz County
California law requires cities and counties to approve EV charger installations administratively, through a building permit or similar nondiscretionary permit, with the building official's review limited to health and safety[12]. It also requires each one to publish a checklist and to accept applications electronically[12].
In unincorporated Santa Cruz County, a Level 2 charger needs an electrical permit submitted through the County's ePlan Review, with plans, load calculations, the manufacturer's cut sheets and the installation instructions[13]. The County's single-family EV checklist asks for electrical plans signed by a California-licensed electrical engineer or a C-10 electrical contractor, and it says permit approval cannot be made subject to a homeowners' association's approval[10]. For 1 to 25 stations it allows 5 business days to deem an application complete, then 20 business days to issue[10].
The City of Santa Cruz publishes its own EV charging checklist[14], and Capitola, Scotts Valley and Watsonville run their own building departments. We pull the permit and coordinate the inspection either way.
Warranty
Tesla warrants the Wall Connector for 48 months in personal use, and its warranty excludes damage from improper installation[15]. Our own workmanship warranty on the installation is separate: see warranty terms.
What to have ready
- Which cars will charge on it, now and in the next few years, and whether any of them is not a Tesla
- Where each car parks, so the 24-foot cable reaches the charge port
- Whether 2.4 GHz Wi-Fi reaches that spot
- A photo of the panel with its door open, if you want a head start on the load question