TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC
  1. TMC is currently READ ONLY.
    Click here for more info.

Tesla wall connector question..

Discussion in 'Model Y' started by tmandrewl, Mar 3, 2021 at 2:23 PM.

  1. ZaN_EV

    ZaN_EV New Member

    Joined:
    Feb 25, 2021
    Messages:
    4
    Location:
    Houston
    This is not true. The manual specifically states that each charger is on it's own branch.
     
  2. Midnightsun

    Midnightsun Member

    Joined:
    Nov 29, 2020
    Messages:
    258
    Location:
    Canada
    #22 Midnightsun, Mar 4, 2021 at 9:31 AM
    Last edited: Mar 4, 2021 at 9:42 AM
    Well I guess we are both slightly wrong. This is straight from the manual however this was 6 months ago. It may be active now which I do not know. I do know if I get another EV I will go this route for installation and power share assuming it is active at that point in time.


    "Power Sharing Overview
    This feature will be available in a future over-the-air firmware update.

    The firmware-based power sharing feature enables up to 16 Wall Connectors installed at the same site to intelligently share the site's total available power via unit-to-unit Wi-Fi. This minimizes the need for many residential and commercial applications to have specific electrical upgrades for concurrent multi-vehicle charging."

    This is similar to pulling into a Supercharging station when packed and you see lower MPH charging as you are sharing the main feed with others, same principle. See page 23 here.
    https://www.tesla.com/sites/default/files/support/charging/Gen3_WallConnector_Installation_Manual.pdf
     
    • Like x 1
  3. cYnbios

    cYnbios Member

    Joined:
    Jan 20, 2021
    Messages:
    7
    Location:
    Orange County, CA
    You're quoting a marketing paragraph but skipping all the technical details. It clearly says on page 23 and 24 that each Wall Connector should be on its own branch circuit.
     
  4. jcanoe

    jcanoe Active Member

    Joined:
    Oct 2, 2020
    Messages:
    1,157
    Location:
    Maryland
    I believe you can pre-wire for additional Wall Connectors to be on the same branch circuit; i.e. 100A branch circuit would be required if you eventually want (2) Wall Connectors to each be capable of individually charging at 48A maximum, 40A simultaneously when there is a second Wall Connector charging. You will not be able to install the second Wall Connector until Tesla releases the needed firmware.
     
  5. Big Earl

    Big Earl bnkwupt

    Joined:
    Jul 12, 2017
    Messages:
    4,886
    Location:
    Springfield, VA
    #25 Big Earl, Mar 4, 2021 at 1:20 PM
    Last edited: Mar 4, 2021 at 1:30 PM
    I believe gen 2 could share a single branch (like my setup at home) but gen 3 require requires one circuit per unit. The gen 3 units will reduce their consumption to maintain a total combined load below whatever you set in software (future update).
     
  6. jcanoe

    jcanoe Active Member

    Joined:
    Oct 2, 2020
    Messages:
    1,157
    Location:
    Maryland
    Then what would be the purpose of load sharing? If I have to have (2) branch circuits, each on a 50A breaker, how would load sharing help?
     
    • Like x 1
  7. cYnbios

    cYnbios Member

    Joined:
    Jan 20, 2021
    Messages:
    7
    Location:
    Orange County, CA
    This is a great question, and I myself asked the same thing. But because the manual says what it says, and there is currently no way to prove that it works on a single circuit, it's hard to assume anything else. If things change in the future then we'll know. Quite frankly throwing out misinformation may make someone think they can run two Gen 3 Wall Connectors on a single 60A circuit and may cause trouble for them. I'm just repeating what the manual says.
     
  8. jcanoe

    jcanoe Active Member

    Joined:
    Oct 2, 2020
    Messages:
    1,157
    Location:
    Maryland
    #28 jcanoe, Mar 4, 2021 at 2:05 PM
    Last edited: Mar 4, 2021 at 2:22 PM
    [Service Panel: 100A breaker] ==========[Wall Connector #1]...==========...[Future Wall Connector #2]

    Wall Connector #1 can immediately be used, can charge a Tesla vehicle at up to 48A.

    You pre-wire for Future Wall Connector #2; the wires are capped, not connected. Wait to install Wall Connector #2 since it can't be activated on the circuit until Tesla releases updated Wall Connector firmware.

    When Tesla releases the updated Wall Connector firmware you complete the installation of Wall Connector #2.
    Either Wall Connector #1 or #2 can charge at up to 48A whenever the other Wall Connector is not charging.
    When both Wall Connector #1 and Wall Connector #2 are charging each Wall Connector can charge at up to 40A on the same 100A circuit.

    This would be a somewhat less expensive alternative to installing two 60A branch circuits.

    If you needed a 3rd Wall Connector you would be able to add Wall Connector #3 to the circuit however when all three Wall Connectors were charging they would each be limited to a maximum of 24A.
     
  9. Big Earl

    Big Earl bnkwupt

    Joined:
    Jul 12, 2017
    Messages:
    4,886
    Location:
    Springfield, VA
    The point would be to not overload the total capacity available. Say you have a 100 amp sub panel and want to install three wall connectors to use the total available power. You could wire them up to three 60 amp circuits and set their software limit to 100 amps. Each unit would get full power individually, but combined they would only load up to 80 amps. I believe this is how @MorrisonHiker has his three gen 2 units setup.

    I guess at the end if they day, the wall connectors don’t care if they have individual circuits or a shared circuit, and will only load to the total that’s set in the configuration.
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC