Modbus collect data from Fronius solar inverter

Hello everyone,

I have read about people trying to use Modbus to collect information, and it doesn’t seem that anyone has posted a success story.

I am about to get a Fronius inverter which supports Modbus TCP.

I would ideally like to collect the information from the inverter and the graph it on my LibreNMS monitoring server. That way all my monitoring is in a one stop shop.

I am aware of the Check_modbus_tcp Nagios plugin, but I’m not sure how I graph the information, if I managed to collect it.

I would greatly appreciate some additional pointers as to where I can look to make this happen.

Kind regards,


@Coolkid currently, there is no standard way to do this. One option would be to hack in something one-off just for the device you want.

For proper support these things need to be added to LibreNMS:

  • Secure Credential Storage
  • Multiple polling protocol support

Those are some big tasks, so the first option is acceptable in my opinion.

May be the solution is to go with a device that will do the MODBUS to SNMP conversion.

I’m currently using openHAB to graph the inverter outputs, and will use it for alerting too.

My openHAB server is being monitored by LibreNMS.

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