MeterHub

The application captures all meters of the building installation, and makes them available via an HTTP JSON API. The different devices (meters, solar inverters, wallboxes, ...) with their different interfaces (USB, RS485, Ethernet, WLAN, ...) are available for different applications via a common interface. Applications based on this are e.g.: Visualisation and databases, solar-controlled wallboxes, battery storage, ... The application is written in Python and usually runs on a Raspberry Pi. The specific configuration is defined directly in meterhub.py.

meterhub.py is the basic application app.py contains the specific queries and assignments config.py contains basic settings and port/address assignments

Example:

http://home:8008/

{
  "time": "2022-01-23 00:08:38", 
  "grid_imp_eto": 3985744,
  "grid_exp_eto": 18804181, 
  "grid_p": 513, 
  "pv1_eto": 16152530, 
  "pv1_p": 0, 
  "car_eto": 735688, 
  "car_p": 0,  
  "car_amp": 6, 
  "car_phase": 1,  
  "car_state": "complete", 
  "water_vto": 1130154, 
  ...
}

Supported devices:

• Solar inverters

  • Fronius Symo

• Electricity meter (RS485 Modbus)

  • Eastron SDM72
  • Eastron SDM120
  • Eastron SDM630

• Electricity meter (SML IR)

  • ISKRA MT175
  • ISKRA MT631
  • ITRON 3.HZ
  • EMH eHZ

• Wallbox

  • Go-e HomeFix

• Generic HTTP-API

  • ESP32 CAM (https://github.com/jomjol/AI-on-the-edge-device)

Usage

Publish

The query on the MeterHub can be used to send data to the MeterHub and make it accessible to other devices via the MeterHub.

Example: A battery storage system polls the MeterHub cyclically. At the same time as the request, the current status of the battery storage is transmitted via POST. Only data that is enabled in publish_config is transferred. A timeout can be set for each variable.

Request with POST : {'bat_soc': 85} --> MeterHub data for all requests: {... 'bat_soc': 85 ...}

Commands

Following the scheme /command/<target>?.... commands can be sent to the MeterHub and forwarded according to app.py own requirements

Example wallbox: Since the MeterHub already queries the data of the wallbox, control is also implemented via it. The special URL parameters are simply passed on by the MeterHub.

Setting the wallbox to 8 amps

http://192.168.0.10:8008/command/goe?amp=8 --> WALLBOX/api/set?amp=8

Install

Python

pip3 install -r requirements.txt

Install Service

sudo cp meterhub.service /etc/systemd/system

Use Service

Commands

sudo systemctl start meterhub
sudo systemctl stop meterhub
sudo systemctl restart meterhub
sudo systemctl enable meterhub
sudo systemctl disable meterhub

Logging

sudo journalctl -u meterhub
sudo journalctl -u meterhub -f