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Sub panel option

Discussion in 'Model 3: Battery & Charging' started by shiz, Jul 20, 2018.

  1. shiz

    shiz Member

    Sep 13, 2015
    Preparing for my first EV, Tesla. What would be the pros and cons of getting a 200amp subpanel to my garage as opposed to 100amp? I do plan to get a HPWC installed on the inside of garage.

    For future proofing, If I end up with two EV years later, would it be unwise to have another HPWC on the outside? Does extreme heat have any affect on the cables during charging?
  2. albtrssp

    albtrssp Member

    Jun 6, 2018
    Bay Area, CA
    200 amps seems to me like it'd be overkill. If you're charging overnight, you won't need to have both of the charging at the same time; the HPWCs will trade off so they're charging one at a time. The cable needed for 100A is already massive (or at least it was for my house, which needed a 50 foot run)
    • Like x 1
  3. Krash

    Krash Data Technician

    Apr 18, 2017
    Intermountain US
    Bigger issue is can your main panel stand to have 200A pulled from just the garage when something like the air conditioner comes on. How large is your electrical service from the utility?
  4. SSedan

    SSedan Active Member

    Jul 24, 2017
    Greenville Wisconsin
    Run 90-100amps to the wall connector, add additional wall connectors to said circuit later if warranted, they can share the 100amp service. Might have some sort of box installed now to facilitate moreconnections later bit it does not need to be a breaker box.

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