MMM-Powerwall

This is a module for the MagicMirror². It displays data from your Tesla Powerwall on your Magic Mirror, optionally including car charging data pulled from your TWCManager (v1.2.0 or later).

If using all the graphs, this works best in one of the full-width positions (upper_third, middle_center, lower_third); individual graphs can work nicely in other positions.

Using the module

To use this module, clone this repo into ~/MagicMirror/modules, run npm install to get dependencies, and add the following configuration block to the modules array in the config/config.js file:

var config = {
    modules: [
        {
            module: 'MMM-Powerwall',
            position: 'lower_third',
            config: {
                // See below for configurable options
            }
        }
    ]
}

You will need to restart the MagicMirror process to load the node_helper.

Authentication depends on Python, due to issues with Node and Raspberry Pi. Make sure you have Python and requests installed: sudo apt install python3 python3-requests

Do not forget to run npm install after updating the module; new dependencies are being introduced because of Tesla's new authentication model.

Configuration options

Option	Description
powerwallIP	Required IP address of the Powerwall endpoint to query
powerwallPassword	Optional Password for local Powerwall endpoint
teslaAPIUsername	Recommended Username for your Tesla account
siteID	Optional if your Tesla account has exactly one energy site; required if multiple are present
twcManagerIP	Optional IP address or hostname of TWCManager instance; if omitted, Tesla API data will be used
twcManagerPort	Optional port of TWCManager's web interface; default is 8080
graphs	Optional Array of tiles to show. Possible values are described below; default is all
localUpdateInterval	Optional How often (in milliseconds) to poll local endpoints (Powerwall and TWCManager) Default 10000 milliseconds (10 seconds)
cloudUpdateInterval	Optional How often (in milliseconds) to poll Tesla API Default 300000 milliseconds (five minutes)
home	Optional Coordinates ([lat, lon]) of your home; used to indicate when car is at home and to get sunrise/sunset times
debug	Optional Enables additional debug output to the browser tools Console and to stderr on the MM, useful for troubleshooting
teslamate	Optional See below

Graphs

This module implements several different graphs. Currently, these are:

• CarCharging
  
• Grid
  
• PowerwallSelfPowered
  
• SolarProduction
  
• HouseConsumption
  
• EnergyBar
  
• PowerLine
  

By default, all are displayed. However, as needed by your layout, you can instantiate multiple instances of this module, each displaying different graphs or even targeting different Powerwall systems. All data is requested, cached, and distributed by the node_helper, so multiple instances referencing the same target will still update simultaneously and will not increase the volume of requests made to either local or cloud endpoints.

Authentication

This module relies on being able to access your Powerwall both locally and via the Tesla API. On older firmware versions, the local endpoint interactions required no authentication; this changed in 20.49.0. There are two authentication paths:

• Sign in via the module. (Recommended) After installing the module, visit /MMM-Powerwall/auth on your MagicMirror HTTP port, e.g. http://192.168.0.52:8080/MMM-Powerwall/auth. You can provide tokens for the Tesla API (links to apps which can help are on that page) and/or the password for your Powerwall's local API. The module will cache tokens for the Tesla API, but needs to retain the actual password for the local API. It is NOT RECOMMENDED that this be the same password used for your Tesla account. If signing in this way, you only need to include your username and Powerwall IP in the module configuration.

• Include your passwords in the module configuration. (Local only) Note that the client downloads config.js during load, so anything in your config file passes unencrypted over the network (unless you've set up TLS). This method also does not work with the Tesla API.

The module will generate tokens.json (for the Tesla API) and localpw.json (for the local Powerwall) after the first successful load with the password(s), so you can remove the password from your config.js file afterward if desired.

Neither the password nor the tokens are sent anywhere except from the node_helper to the Tesla API. Feel free to verify this in the code.

Teslamate Integration

If you have installed Teslamate, it exposes an MQTT server with information about monitored Tesla vehicles. To make the best use of this integration:

• Your mosquitto instance should have the options persistence true and a persistence_location configured.
• Either set allow_anonymous true or provide a username and password in options.

The teslamate configuration option is an object with the following fields:

Option	Description
url	Required URL to access the Mosquitto server
namespace	Optional If you have configured a custom namespace (with MQTT_NAMESPACE), supply it here
options	Optional If you need to pass any options to the MQTT client, supply them here.

The Teslamate connection will be associated with the Tesla account supplied in the same config.

Dependencies and Acknowledgements

This module relies on the following APIs:

• The Tesla Owner's API, picked apart at https://www.teslaapi.io/
• The Tesla Compositor API, picked apart at https://teslaownersonline.com/threads/teslas-image-compositor.7089/
• The Powerwall local API, picked apart at https://github.com/vloschiavo/powerwall2
• The TWCManager local API, documented at https://github.com/ngardiner/TWCManager/blob/v1.2.0/docs/modules/Control_HTTP.md
• The Sunrise Sunset API, documented at https://sunrise-sunset.org/api
• The ArcGIS Reverse Geocode API, documented at https://developers.arcgis.com/rest/geocode/api-reference/geocoding-reverse-geocode.htm
• Powerline icon made by Freepik from https://www.flaticon.com/

In addition to any commiters to the repo, the following have helped figure certain pieces out:

• @ngardiner's work on TWCManager is amazing, and the car charging could not be tracked without it
• @Kemmey provided initial code for interacting with the compositor
• Access to Tesla's v3 authentication endpoint adapted from enode-engineering/tesla-oauth2