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The local Powerwall 2 API is documented here: https://github.com/vloschiavo/powerwall2 but keep in mind that Tesla seems to be slowly taking away end points in recent firmware updates.
Check out the powerwall_monitor project on GitHub. This sets up a complete stack with a Grafana dashboard, influxdb backend, and telegraf to grab the data. Of note, as u/kairojya also mentioned, the local API has been becoming more difficult over the last few months. It not uses a non-standard authentication channel that breaks direct access with telegraf - but the project has a workaround.
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