Energy Products

POWERWALL & 2 MODEL 3: is it possible to charge when PW is full

Is it possible to automate the start of the car charging when the Powerwall2 reached the 100% of the charge?

I live in a city where the electricity company doesn't pay 1 to 1 for the excess of solar energy, so I want to fully charge the powerwalls and then immediately start charging my car.

Is it possible through any APIs or IFTTT or some 3rd party app to automate such combination?


  • bpbp
    edited February 24
    Even if you can detect when the PowerWall(s) are near fully charged, not sure if you can start charging.

    Another factor to consider - the PowerWalls hold much less charge than S/3/X vehicles, and a single PowerWall can only sustain a maximum of around 22A of vehicle charging (assuming nothing else is using power).

    We have 4 PowerWalls and have our Tesla HPWCs connected directly to the grid - not to our PowerWalls.

    During installation of the PowerWalls, we added a 14-50 outlet connected to the PowerWalls, and plan to manually use that outlet only during an extended power outage or if we have a string of very sunny days fully charging the PowerWalls, and we want to avoid sending excess solar energy back to the grid.
  • edited February 24

    Remotely in real-time:

    - You can read the TEG and see when PW's are charged.
    - You can read your home consumption.
    - You can read your solar generation.
    - You can turn on/off Model 3 charging.
    - You can set Model 3 charge level.

    What you can’t do, and this is a shame, is remotely set the Model 3 charge current. This is the missing piece to allow one to write a simple script that, when used with the above mentioned features, will remotely start charging the Model 3 from rooftop solar avoiding the grid and just as importantly, avoiding the round-trip Powerwall loss and cycles.

    This is discussed on other Tesla boards. I do not know why Elon did not give us an API end-point for Model 3 charge current.
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