Warning

I don't have time to work on this anymore. It may or may not work for you. Refer to this comment for alternatives

This is a Hassio addon to monitor voltronic axpert inverters through USB and publish the data as JSON to an MQTT broker. It publishes the data to 3 topics:

• 'power/axpert' for the parallel data (some of these values seem to be only for the connected inverter even though they are returned by the parallel data command)
• 'power/axpert_settings' for the configured settings
• 'power/axpert{sn}' for the data from the connected inverter (configurable, {sn} is replaced with the serial number of the inverter)

You can then configure the sensors in Home Assistant like this:

sensors:
  - platform: mqtt
    name: "Power"
    state_topic: "power/axpert"
    unit_of_measurement: 'W'
    value_template: "{{ value_json.TotalAcOutputActivePower }}"
    expire_after: 60

The values published on 'power/axpert' are:

• SerialNumber # of the first inverter in the parallel setup
• TotalAcOutputActivePower
• TotalAcOutputApparentPower
• TotalAcOutputPercentage
• BatteryChargingCurrent
• BatteryDischargeCurrent
• TotalChargingCurrent
• GridVoltage
• GridFrequency
• OutputVoltage
• OutputFrequency
• OutputAparentPower
• OutputActivePower
• LoadPercentage
• BatteryVoltage
• BatteryCapacity
• PvInputVoltage
• OutputMode
• ChargerSourcePriority
• MaxChargeCurrent
• MaxChargerRange
• MaxAcChargerCurrent
• PvInputCurrentForBattery
• Gridmode
• Solarmode

The values published on 'power/axpert_settings' are:

• AcInputVoltage
• AcInputCurrent
• AcOutputVoltage
• AcOutputFrequency
• AcOutputCurrent
• AcOutputApparentPower
• AcOutputActivePower
• BatteryVoltage
• BatteryRechargeVoltage
• BatteryUnderVoltage
• BatteryBulkVoltage
• BatteryFloatVoltage
• BatteryType
• MaxAcChargingCurrent
• MaxChargingCurrent
• InputVoltageRange
• OutputSourcePriority
• ChargerSourcePriority
• MaxParallelUnits
• MachineType
• Topology
• OutputMode
• BatteryRedischargeVoltage
• PvOkCondition
• PvPowerBalance
• MaxBatteryCvChargingTime

The values published on 'power/axpert{sn}' are:

• BusVoltage
• InverterHeatsinkTemperature
• BatteryVoltageFromScc
• PvInputCurrent
• PvInputVoltage
• PvInputPower
• BatteryChargingCurrent
• BatteryDischargeCurrent
• DeviceStatus

I have 3 inverters in parallel and a raspberry connected to 1 of them with a USB cable . Linux doesn't seem to recognize it as a USB to Serial device and it only shows up as /dev/hidraw0.

A description of the serial communication protocol can be found here

Install

Add https://github.com/MindFreeze/home-assistant-addons to the addon store repositories and you will get a Axpert Inverter listed there. Note that this assumes the inverter is /dev/hidraw0. If you have other USB to Serial devices connected this might be wrong.