axpert-inverter-monitor

Simple monitoring for Axpert/Voltronic type inverters via a connected Raspberry Pi. No MQTT needed.

Pre-requisites:

1. Download, build and install Manio's inverter poller: https://github.com/manio/skymax-demo
2. Test and make sure you can poll your inverter (poller returns results).
3. Recommended - install and run log2ram to save your SD card since polling writes to disk very frequently - https://github.com/azlux/log2ram
4. A web server with PHP installed, serving files from "/var/www/html". I recommend Lighttpd.

Installation:

1. Copy poll.sh and monitorconfig.json to same directory as inverter poller.
2. Copy InverterMonitor.php, InverterMonitor.png and loader.js to "/var/www/html" directory.
3. Run "chmod +x ./inverter_poller" to make executable.
4. Run "chmod +x ./poll.sh" to make executable.
5. Edit "/etc/log2ram.conf" and add the "/var/www/html/im" directory to cache it to RAM.
6. Execute by running "./poll.sh &". The ampersand lets the script run in the background. To terminate it, find the PID with "pidof -x poll.sh", then "kill x", where x is the PID returned.

Optional:

• Edit monitorconfig.json (applies only to web-monitor) - Set your inverter model and battery count here (battery count used in voltage calculation).
• Edit inverter.conf (you should not need to, interval here does not apply).

Usage:

Use with included PHP web-monitor. This is a webpage showing your inverter data that auto-resfreshes every 10 seconds. Simply navigate to http://yourraspberrypi/InverterMonitor.php

Or

Use with IOT Dashboard: https://play.google.com/store/apps/details?id=com.cpk.iotdashboard

IOT Dashboard must fetch data from:

• http://yourraspberrypi/im/data.json - Inverter data
• http://yourraspberrypi/im/poll.json - Last poll time/date

It can also fetch graph data:

• http://yourraspberrypi/im/load_history.json - Load percentage history
• http://yourraspberrypi/im/temp_history.json - Temperature history
• http://yourraspberrypi/im/ac_in_history.json - Grid AC input voltage history
• http://yourraspberrypi/im/batt_history.json - Battery discharge amperage history

You can create your own graphs by editing poll.sh and grepping different values of interest.

NOTE: IOT Dashboard requires extensive configuration to parse the JSON data, so be prepared for trial and error.

Bonus points:

Install ZerotierOne on your Pi and mobile device to be able to monitor your inverter from anywhere, not just your local network. You'll need to bridge your LAN/WLAN and Zerotier interface on the Pi. More info here: https://zerotier.atlassian.net/wiki/spaces/SD/pages/224395274/Route+between+ZeroTier+and+Physical+Networks

Credits:

• Acknowledgements to the original inverter poller developer: https://github.com/manio
• Acknowledgements to the developer of IOT Dashboard: https://play.google.com/store/apps/developer?id=Ciprian+Savastre