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smart-energy-monitor/docs/shelly-monitor/README.md

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Shelly Plug (S)

Shelly Plugs S are quite cheap but relatively accurate to measure power consumptions less than 2.5 kW.

Shelly Plug

Flash Tasmota

There's an OpenSource project to flash Tasmota on Shelly Plugs: mg2x.

Locate your Shellie's IP adress (in my case: 192.168.2.150) and update it "over the air" with the Tasmota firmware:

http://192.168.2.150/ota?url=http://ota.tasmota.com/tasmota/shelly/mg2tasmota-ShellyPlugS.zip

Your Shelly will return a JSON object that looks like that:

{
  "status": "updating",
  "has_update": false,
  "new_version": "20230109-114426/v1.12.2-g32055ee",
  "old_version": "20230109-114426/v1.12.2-g32055ee"
}

After a while your Shelly Plug S should be flashed with Tasmota firmware.

Just be patient. This took longer than five minutes in my DSL connected network.

The Shelly Plus S will create create a new Wifi.

Tasmota Wifi

Join that Wifi and configure the device: http://192.164.4.1/

Join Wifi

You can configure it as a BlitzWolf SHP product.

Then it offers you power measurement and a programmable toogle.

BlitzWolf

It should be configurable just like our plant monitor.

Just enable MQTT and enter a shorter telemetry period.

MQTT Telemetry period

It will post MQTT messages unter a topic tele/tasmota_891E97/SENSOR like this one:

{
  "Time": "2023-02-27T16:45:07",
  "ENERGY": {
    "TotalStartTime": "2023-02-27T16:33:06",
    "Total": 0.004,
    "Yesterday": 0,
    "Today": 0.004,
    "Period": 0,
    "Power": 34,
    "ApparentPower": 44,
    "ReactivePower": 27,
    "Factor": 0.79,
    "Voltage": 253,
    "Current": 0.172
  }
}

We now can consume this messages in Node-RED, store them in InfluxDB and build a dashboard in Grafana.

If you haven't deployed the IoT prototyping backend yet, check out our guide.

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