Under Construction
last updated 13 Dec 2018

Contents: Overview | Installing a Home Charging station: | Circuit Breaker Table | Terms

Overview:

Charging Levels:
Level Time for S/X 100
Level 1 (120 volt) charging 4 days
Level 2 (240 volt) charging 6-30 hrs
Level 3 (480 volt) Supercharging
or DC fast charging
30 minutes to 170 mi. range


Level 2 Charging:
Level 2 charging is limited by:
  1. The circuit breaker for the circuit going to your Tesla charging port,which is determined by wire gauge (AWG).
    The tesla computer will determine maximum charge based on voltage drop when it starts up.
    Voltage drop is determined by wire gauge and length from your circuit breaker to car.
    Another high amperage circuit in your home (Air Conditioner, Stove, Clothes Dryer) can also cause voltage drop when they come on. This depends on the total capacity of your home's circuit breaker. It only dropped a little over 1 V with both the oven and dryer on in my house.
  2. The On-board charger (OBC) capacity which varies by model.
  3. The type of connection: HPWC Wall connector or the Corded Mobile Connector which comes with your car.
    All models now use the Corded Mobile Connector with a 32 Amp capacity to avoid overheating.

On-board charger (OBC)
Model Max Amps
OBC ‡
MPH* Range Time to Charge
NEMA
14-50
Wall Connector
Model S 75 kWh battery pack 48 A 34 250 mi 11 hrs 7 hrs
Model S 100 kWh battery pack 48 A 34 335 mi 15 hrs 10 hrs
Model 3 std 50 kWh 32 A 30 220 mi 7 hrs 7 hrs
Model 3 long range 75 kWh 40 A 37 310 mi 10 hrs 8 hrs
* MPH - Miles per hour of charging

‡ - With the NEMA 14-50 wall outlet charging amps is limited to 32 A by the Corded Mobile Connector.

Note: Tap the lightning bolt icon on the touchscreen to view the max amperage of your vehicle.

An easy rule of thumb for Model 3 is for every amp at 240V, you get about 1mi/h of charging (assuming moderate temps).


Installing a Home Charging station:
There are two basic options for 240v charging.
Type Max Amps
NEMA 14-50 32 Uses Corded Mobile Connector which comes with your car.
HPWC Wall connector S, X - 48 A; 3LR - 40 A; 3 std - 32 A Includes Cable
   
IEC 62196-2 type 2 EU EV IEC 62196 - Wikipedia

Model Recommended circuit breaker
for maximum charge rate
Model S 75D, 100D, P100D
Model X 75D, 100D, P100D
Model 3 Long Range
60 amp circuit breaker
Model 3 Mid Range
Model 3 Standard Range
40 amp circuit breaker
Multiple Tesla cars with 2+ Wall Connectors
installed for power sharing
100 amp circuit breaker
Source breaker-table Wall Connector | Tesla
See other breaker options below.

Corded Mobile Connector $520
Model S/X/3 Wall Connector $500

The Wall Charger ($500 plus abt. $500 labor) comes with a cable so all you have to do is plug it into your tesla.

There are 3rd party Charging Stations:
e.g. Amazon.com: JuiceBox Pro 40 Smart Electric Vehicle (EV) Charging Station with WiFi - 40 amp Level 2 EVSE, 24-foot cable, NEMA 14-50 plug, UL and Energy Star Certified, Indoor / Outdoor Use 2 cables. $900


Costs:
Type Max Amps Cost
Hardware Labor
NEMA 14-50 32
Wall connector 32 - 48
Depending on model

A NEMA 14-50 wall outlet which will work with the Universal Mobile Connector.
A Wall Connector with its own cable. Which is required to get 48 Amps.

A dedicated 60 amp 240 volt circuit is recommended for the S, X and 3 long-range.
A 40 amp 240 volt circuit is OK for the standard model 3.

60 amps requires AWG 6/4 cable - $2.80/ft, - $85 for 30 ft
40 amps requires AWG 8/4 cable - $1.84/ft - $55 for 30 ft
NEMA 14-50 wall outlet $10

Circuit Breaker Table
Wall Connector
Technical details
Charge speed
Miles of range per hour of charge
Circuit breaker
(amps)
Maximum output
(amps)
Power at 240 volts
(kilowatt)
Model 3
(mph)
Model S
(mph)
Model X
(mph)
100 80 19.2 kW 44 34 30
90 72 17.3 kW 44 34 30
80 64 15.4 kW 44 34 30
70 56 13.4 kW 44 34 30
60 48 11.5 kW 44 34 30
50 40 9.6 kW 37 29 25
45 36 8.6 kW 34 26 23
40 32 7.7 kW 30 23 20
35 28 6.7 kW 26 20 17
30 24 5.7 kW 22 17 14
25 20 4.8 kW 19 14 11
20 16 3.8 kW 15 11 8
15 12 2.8 kW 11 7 5
Source Wall Connector | Tesla

Note: Los Angeles code requires 100 Amp for a wall charger.

The second generation UMC is 32A, and is sold with all Teslas now. So even though the cars can accept up to 48A, the only way to get that would be higher-amperage J1772 EVSEs (plus Tesla adapter), or the Tesla Wall Connectors.

Some recommend limiting charging to 40 A to avoid heating up the components, which they claim shortens the life of electronics, metal solder joints, ...

Terms in electric vehicle charging:

Links:
Best Home Chargers For Your Money
Home Charging Installation | Tesla
A look at Tesla Model 3 charging options - Electrek
Tesla Charging: The Complete Guide to Charging at Home, in Public and Autonomously | Plugless Power
Tesla Model 3 Home Charging Guide | TeslaTap


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