- First Name
- A. J.
- Dec 8, 2019
- Reaction score
- Tesla X LR+, Lexus SUV, Toyota SR5, Toyota Landcruiser
- EE (Retired)
The discussion in this thread is about EVSE (Electric Vehicle Service Equipment) and in particular Tesla's HPWC (High Power Wall Connector). Nobody thinks either of these is a charger (well maybe someone does) even though we are sloppy and often refer to EVSE as a charger. It is common to refer to the small portable EVSE that ships with the Tesla's is often referred to as a UMC (Universal Mobile Charger) but everyone understands that it is really EVSE. Everyone also refers to those kiosk like things at SC's as chargers. The chargers area actually in the cabinets behind the fence. Again, everyone understands this.my god people. the charger is built into the car !
I'm not sure what this means. There are 120 V outlets (T-23) that can supply 24A to the car but this sounds more as if you mean regular 120 V outlets which must not be used to draw more than 12 A if on a 15A breaker or 16A if on a 20 A breaker.i have a gadget that you can ever plug into 120 volt outlets and sends 23 amps to the charger on board the car.
EVSE, in particular, the Tesla HPWC, do not use the neutral. You can wire it if you like but it's not used. More significant is that the UMC does not come with a 15-50 adapter. People reading this thread will want to install 14-50. Thus if you are using the UMC with 15-50R you have to be using an adapter that you made yourself or that you got from someone other than Tesla. If that adapter looks, in terms of charging current limit, like a 14-50R or plugs into the Telsa 14-50R adapter you are OK. Otherwise you must set the car's charging limit to 40A. Note that if you go through Tesla's 14-50R adapter (i.e. 15-50P --> 14-50R --> Telsa 4-50P --> UMC) charging current will be limited to 32 A. A third party manufacturer might have the proper programming resistor in his product to allow the full 40 A.ithe charger is not on the wall of your garage. at our collision repair shop i have every 230/60/1 nema 15-50 plug wired with a neutral wire and plug any tesla model anywhere in shop or outside park lot
The HPWC is a great deal more than that. To begin with and relevant to the reason one should not install 15-50R receptacles is the aforementioned adapters furnished for use with the UMC. One of the UMC's functions is to determine how much power the car can have which depends on the outlet. The UMC gets information about the outlet by reading the adapter. In the Gen 2 HPWC that information is programmed into the HPWC by a rotary switch. In the Gen 3 it is set from a page served out by the HPWC over WiFi. Thus the Gen 3 contain extensive communications hardware and software sufficient to interface the car's charging circuitry, via the communication wires in the cable to the internet and local WiFi network. Thus the car is able to communicate how much power it wants and this can be compared to the amount that is available considering the total draw of other cars on the same WiFi network and the capabilities of the wiring. The HPWC then sends a message to the car telling it how much power it can have. It continuously monitors the network so that, for example, it can grant more power to the car it is connected to if another car on the network completes charging. The HPWC also checks that the grounding conductor is present and properly connected and of course contains a contactor to disconnect the car from the mains except when charging is authorized. It also checks with the mother ship for firmware upgrades and downloads them when they are available. Thus to call it nothing more than a cord is a greater error than to call it the charger as it is, obviously, a very significant part of the charger.CHARGER IS ON THE CAR The silver box from tesla you can buy is nothing more that a cord from power source to tesla car and it looks pretty