Growatt data for your smart home

1. In the box settings, MQTT & Home Assistant: broker address, user, password. Save.
2. The Growatt Monitor device appears on its own under Settings › Devices & services › MQTT.
3. Add the sensors to a dashboard and to the Energy page.

Home Assistant guide, with the automation generator →

1. Install a JSON-reading plugin from the Jeedom Market.
2. Create a device pointing at the box’s local JSON address, with your access key.
3. Add one info command per field, for example pv_w, and use them in your scenarios.

http://moniwatt.local/api.json?key=YOUR_KEY

→ pv_w

1. An inject node every minute, then an http request node (GET, returns a parsed JSON object) on the box’s address.
2. Read msg.payload.pv_w in a switch or function node.
3. Or skip polling: an mqtt in node on the box’s state topic receives every new reading.

[inject 60 s] → [http request GET http://moniwatt.local/api.json?key=YOUR_KEY]
  → [function] return { payload: msg.payload.pv_w };

1. Hardware: add “MQTT Auto Discovery Client Gateway” pointing at your broker.
2. Turn on MQTT and Home Assistant discovery in the box settings.
3. The devices appear in Domoticz on their own, ready for dzVents or Blockly.

1. Add an HTTP thing on the box’s local JSON address, refresh 60 s.
2. Create one channel per value with a JSONPath such as $.pv_w.
3. Link the channels to items. The MQTT binding works too.

Thing http:url:box "Growatt Monitor" [ baseURL="http://moniwatt.local/api.json?key=YOUR_KEY", refresh=60 ] {
  Channels:
    Type number : pv_w [ stateTransformation="JSONPATH:$.pv_w" ]
}

1. Read the box’s local JSON address with your access key, at the pace you like.
2. Or subscribe to MQTT under the moniwatt/ prefix (changeable in the settings).
3. Read-only: nothing you send can change a setting of your equipment.

curl -s 'http://moniwatt.local/api.json?key=YOUR_KEY' | jq .pv_w

python3 -c "import json,urllib.request as u;print(json.load(u.urlopen('http://moniwatt.local/api.json?key=YOUR_KEY'))['pv_w'])"

1. Switch the free Cloud on and link the box to your account.
2. Copy the private JSON link of the box from your dashboard.
3. Read it from IFTTT, Make.com, Apilio or a phone widget: no port to open at home.

https://growatt-monitor.com/online/YOUR_KEY.json

How the free Cloud works →