sigenergy2mqtt 2025.7.19

Publish Modbus data from Sigenergy to MQTT, with optional Home Assistant Auto-Discovery and PVOutput updating

sigenergy2mqtt is a bridge between the Modbus interface of the Sigenergy energy system and the MQTT lightweight publish/subscribe messaging protocol.

In addition, sigenergy2mqtt has several optional features:

1. It can publish the appropriate messages to allow Home Assistant to automatically discover the Sigenergy devices, simplifying Home Assistant configuration.
2. Production and consumption data can automatically be uploaded to PVOutput.

sigenergy2mqtt was inspired the Home Assistant integrations developed by TypQxQ.

Contents

• Disclaimer
• Installation
• Configuration
  • Configuration File
  • Command Line Options
  • Environment Variables
• MQTT Publish and Subscribe Topics

Disclaimer

sigenergy2mqtt was developed for my own use, and as such has only been tested in my single-phase environment without AC or DC chargers. In addition, there has been only cursory testing of the write functions. If you find a problem, please raise an issue.

Installation

Follow the installation guides for supported environments:

• Home Assistant
• Docker
• Linux

Configuration

You can configure sigenergy2mqtt via the command line and/or environment variables, but using a persistent configuration file is a better option, as it provides access to all advanced feature configuration.

Configuration File

The complete list of configuration options with associated comments can be found in sigenergy2mqtt.yaml.

Example:

home-assistant:
  enabled: true
mqtt:
  broker: 127.0.0.1
  username: ""
  password: ""
modbus:
  - host: sigenergy.local
    inverters: [ 1 ]
pvoutput:
  enabled: false
  api-key: your_api_key
  system-id: your_system_id
  interval-minutes: 5
  consumption: true

Notes:

• Configure your MQTT broker IP address/host name and Sigenergy IP address/host name as appropriate for your environment.
• The number in square brackets after inverters is the Device ID (slave address) as advised by your installer. It is usually 1. If you have multiple inverters, separate them with commas (e.g. [ 1,2 ])
• If your MQTT broker does not require authentication, add the option anonymous: true under mqtt.
• By default, only entities relating to production, consumption and battery charging/discharging are enabled (all other entities will still appear in Home Assistant, but will be disabled). All other entities are disabled by default. If you want all entities to be initially enabled, set sensors-enabled-by-default to true. This setting only applies the first time that Home Assistant auto-discovers devices and entities; changing this configuration after first discovery will have no effect. Entities can be enabled and disabled through the Home Assistant user interface.
• The default location for sigenergy2mqtt.yaml is in /etc/. However, it will also be found in /data/. You can also use the -c command line option or the SIGENERGY2MQTT_CONFIG environment variable to specify a different location and/or filename.

Configuring Smart-Port Production

Prior to the V100R001C00SPC108 firmware update, production systems connected to the Sigenergy Gateway Smart-Port were included in the Plant PV Power reported by the Modbus interface. In firmware V100R001C00SPC108, the PV Power register only reports production from panels connected directly to Sigenergy. Firmware V100R001C00SPC109 adds a new sensor for Third-Party PV Power. This register, however, only appears to be updated every 8-10 seconds in my testing with my Enphase micro-inverters, so if you want more frequent updates of Total PV Power and Consumed Power, then you should enable smart-port in the configuration and configure either the Enphase Envoy and/or the MQTT smart-port integrations.

• When smart-port is not enabled in the configuration, the Plant Total PV Power sensor will be the sum of Plant PV Power and Third-Party PV Power.
• When smart-port is enabled in the configuration, the Plant Total PV Power sensor will be the sum of PV Power and all configured Smart-Port PV Power sensors (Enphase Envoy and/or MQTT). Also, if the Smart-Port PV Power sensor fails to provide updates, sigenergy2mqtt will automatically fail-over to using the Third-Party PV Power sensor, and fail-back when it becomes available again.

Enphase Envoy

This configuration only works with Enphase Envoy firmware versions prefixed with D7 and D8. Add the Envoy host and login details to your sigenergy2mqtt configuration file:

...
modbus:
  - host: your_sigenergy_ip_address
    inverters: [ 1 ]
    log-level: INFO
    smart-port:
      enabled: true
      module: 
        name: enphase
        host: your_enphase_envoy_ip_address
        username: your_enphase_enlighten_username
        password: your_enphase_enlighten_password
        pv-power: EnphasePVPower
...

Notes:

1. The module name must be set to enphase.
2. The module pv-power configuration must be set to EnphasePVPower to create the Plant Total PV Power sensor to accumulate the Enphase PV production and Sigenergy PV production.

Any System Already Integrated with Home Assistant

This configuration requires adding the MQTT topics to which sigenergy2mqtt will subscribe to get the third-party PV power production updates, and setting up an automation within Home Assistant to publish the third-party PV power production to MQTT whenever it changes.

1. sigenergy2mqtt Configuration File

...
modbus:
  - host: your_sigenergy_ip_address
    inverters: [ 1 ]
    log-level: INFO
    smart-port:
      enabled: true
      mqtt:
        - topic: sigenergy2mqtt/smartport/envoy_nnnnnnnnnn_current_power_production/state
          gain: 1
...

Notes:

• The topic can be anything meaningful.
• The gain represents the multiplier to convert the state to watts (so if it is provided in kWh, 1000 is the multiplier).
• You can specify multiple MQTT topic/gain pairs in the configuration file (but command line and environment overrides are limited to a single topic).

2. Home Assistant Automation

Create a new automation and enter a YAML configuration similar to this, using the entity_id that contains the current PV power production from your third-party inverter (this example uses Enphase again):

alias: Publish Envoy PV Production
description: "Update sigenergy2mqtt with the current PV production reported by Enphase Envoy"
triggers:
  - trigger: state
    entity_id:
      - sensor.envoy_nnnnnnnnnn_current_power_production
conditions: []
actions:
  - action: mqtt.publish
    data:
      topic: sigenergy2mqtt/smartport/envoy_nnnnnnnnnn_current_power_production/state
      payload: "{{ trigger.to_state.state }}"
mode: queued

Notes:

• The topic(s) must match in both the sigenergy2mqtt configuration and the Home Assistant automation.

Command Line Options

Command line options override both environment variables and the configuration file.

  -h, --help            show this help message and exit
  -c [SIGENERGY2MQTT_CONFIG], --config [SIGENERGY2MQTT_CONFIG]
                        The path to the JSON configuration file (default: /etc/sigenergy2mqtt.yaml)
  -l {DEBUG,INFO,WARNING,ERROR,CRITICAL}, --log-level {DEBUG,INFO,WARNING,ERROR,CRITICAL}
                        Set the log level. Valid values are: DEBUG, INFO, WARNING, ERROR or CRITICAL. Default is WARNING 
                        (warnings, errors and critical failures)
  -d SIGENERGY2MQTT_DEBUG_SENSOR, --debug-sensor SIGENERGY2MQTT_DEBUG_SENSOR
                        Specify a sensor to be debugged using either the full entity id, a partial entity id, the full sensor class name, 
                        or a partial sensor class name. For example, specifying 'daily' would match all sensors with daily in their entity 
                        name. If specified, --debug-level is also forced to DEBUG
  --sanity-check-default-kw SIGENERGY2MQTT_SANITY_CHECK_DEFAULT_KW
                        The default value in kW used for sanity checks to validate the maximum and minimum values for actual value of 
                        power sensors and the delta value of energy sensors. The default value is 100 kW per second, and readings outside 
                        the range are ignored. 
  --hass-enabled        Enable auto-discovery in Home Assistant.
  --hass-discovery-prefix [SIGENERGY2MQTT_HASS_DISCOVERY_PREFIX]
                        The Home Assistant MQTT Discovery topic prefix to use (default: homeassistant)
  --hass-entity-id-prefix [SIGENERGY2MQTT_HASS_ENTITY_ID_PREFIX]
                        The prefix to use for Home Assistant entity IDs. Example: A prefix of 'prefix' will prepend 'prefix_' to entity IDs
                         (default: sigen)
  --hass-unique-id-prefix [SIGENERGY2MQTT_HASS_UNIQUE_ID_PREFIX]
                        The prefix to use for Home Assistant unique IDs. Example: A prefix of 'prefix' will prepend 'prefix_' to unique IDs
                         (default: sigen). Once you have set this, you should NEVER change it, as it will break existing entities in 
                         Home Assistant.
  --hass-device-name-prefix [SIGENERGY2MQTT_HASS_DEVICE_NAME_PREFIX]
                        The prefix to use for Home Assistant entity names. Example: A prefix of 'prefix' will prepend 'prefix ' to names 
                        (default: '')
  --hass-discovery-only
                        Exit immediately after publishing discovery. Does not read values from the Modbus interface, 
                        except to probe for device configuration.
  -b [SIGENERGY2MQTT_MQTT_BROKER], --mqtt-broker [SIGENERGY2MQTT_MQTT_BROKER]
                        The hostname or IP address of an MQTT broker (default: 127.0.0.1)
  --mqtt-port [SIGENERGY2MQTT_MQTT_PORT]
                        The listening port of the MQTT broker (default: 1883)
  --mqtt-anonymous      Connect to MQTT anonymously (i.e. without username/password).
  -u [SIGENERGY2MQTT_MQTT_USERNAME], --mqtt-username [SIGENERGY2MQTT_MQTT_USERNAME]
                        A valid username for the MQTT broker
  -p [SIGENERGY2MQTT_MQTT_PASSWORD], --mqtt-password [SIGENERGY2MQTT_MQTT_PASSWORD]
                        A valid password for the MQTT broker username
  --mqtt-log-level {DEBUG,INFO,WARNING,ERROR,CRITICAL}
                        Set the paho.mqtt log level. Valid values are: DEBUG, INFO, WARNING, ERROR or CRITICAL. 
                        Default is WARNING (warnings, errors and critical failures)
  -m [SIGENERGY2MQTT_MODBUS_HOST], --modbus-host [SIGENERGY2MQTT_MODBUS_HOST]
                        The hostname or IP address of the Sigenergy device
  --modbus-port [SIGENERGY2MQTT_MODBUS_PORT]
                        The Sigenergy device Modbus port number (default: 502)
  --modbus-slave [SIGENERGY2MQTT_MODBUS_INVERTER_SLAVE]
                        The Sigenergy Inverter Modbus Device ID (Slave ID). May be specified multiple times.
  --modbus-accharger-slave [SIGENERGY2MQTT_MODBUS_ACCHARGER_SLAVE]
                        The Sigenergy AC Charger Modbus Device ID (Slave ID).
  --modbus-dccharger-slave [SIGENERGY2MQTT_MODBUS_DCCHARGER_SLAVE]
                        The Sigenergy DC Charger Modbus Device ID (Slave ID).
  --modbus-readonly     Only publish read-only sensors to MQTT. Neither read-write or write-only sensors will be 
                        published if specified.
  --modbus-no-remote-ems
                        Do not publish any read-write sensors for remote Energy Management System (EMS) integration to MQTT. 
                        Ignored if --modbus-read-only is specified.
  --modbus-log-level {DEBUG,INFO,WARNING,ERROR,CRITICAL}
                        Set the pymodbus log level. Valid values are: DEBUG, INFO, WARNING, ERROR or CRITICAL. 
                        Default is WARNING (warnings, errors and critical failures)
  --scan-interval-low [SIGENERGY2MQTT_SCAN_INTERVAL_LOW]
                        The scan interval in seconds for Modbus registers that are to be scanned at a low frequency. Default is 600 (seconds), and the minimum value is 300.
  --scan-interval-medium [SIGENERGY2MQTT_SCAN_INTERVAL_MEDIUM]
                        The scan interval in seconds for Modbus registers that are to be scanned at a medium frequency. Default is 60 (seconds), and the minimum value is 30.
  --scan-interval-high [SIGENERGY2MQTT_SCAN_INTERVAL_HIGH]
                        The scan interval in seconds for Modbus registers that are to be scanned at a high frequency. Default is 10 (seconds), and the minimum value is 5.
  --scan-interval-realtime [SIGENERGY2MQTT_SCAN_INTERVAL_REALTIME]
                        The scan interval in seconds for Modbus registers that are to be scanned in near-real time. Default is 5 (seconds), and the minimum value is 1.
  --smartport-enabled   Enable interrogation of a third-party device for production data.
  --smartport-module-name [SIGENERGY2MQTT_SMARTPORT_MODULE_NAME]
                        The name of the module which will be used to obtain third-party device production data.
  --smartport-host [SIGENERGY2MQTT_SMARTPORT_HOST]
                        The IP address or hostname of the third-party device.
  --smartport-username [SIGENERGY2MQTT_SMARTPORT_USERNAME]
                        The username to authenticate to the third-party device.
  --smartport-password [SIGENERGY2MQTT_SMARTPORT_PASSWORD]
                        The password to authenticate to the third-party device.
  --smartport-pv-power [SIGENERGY2MQTT_SMARTPORT_PV_POWER]
                        The sensor class to hold the production data obtained from the third-party device.
  --smartport-mqtt-topic [SIGENERGY2MQTT_SMARTPORT_MQTT_TOPIC]
                        The MQTT topic to which to subscribe to obtain the production data for the third-party device.
  --smartport-mqtt-gain [SIGENERGY2MQTT_SMARTPORT_MQTT_GAIN]
                        The gain to be applied to the production data for the third-party device obtained from the MQTT topic. 
                        (e.g. 1000 if the data is in kW) Default is 1 (Watts).
  --pvoutput-enabled    Enable status updates to PVOutput.
  --pvoutput-api-key [SIGENERGY2MQTT_PVOUTPUT_API_KEY]
                        The API Key for PVOutput
  --pvoutput-system-id [SIGENERGY2MQTT_PVOUTPUT_SYSTEM_ID]
                        The PVOutput System ID
  --pvoutput-consumption
                        Enable sending consumption status to PVOutput.
  --pvoutput-interval [SIGENERGY2MQTT_PVOUTPUT_INTERVAL]
                        The interval in minutes to send data to PVOutput (default: 5). Valid values are 5, 10 or 15 minutes.
  --pvoutput-temp-topic [SIGENERGY2MQTT_PVOUTPUT_TEMP_TOPIC]
                        An MQTT topic from which the current temperature can be read. This is used to send the temperature to PVOutput. If not specified, the temperature will not be sent to PVOutput.
  --pvoutput-log-level {DEBUG,INFO,WARNING,ERROR,CRITICAL}
                        Set the PVOutput log level. Valid values are: DEBUG, INFO, WARNING, ERROR or CRITICAL. Default is WARNING 
                        (warnings, errors and critical failures)
  --clean               Publish empty discovery to delete existing devices, then exits immediately.
  -v, --version         Shows the version number, then exits immediately.

Environment Variables

Environment variables override the configuration file, but not command line options.

Name	Description
SIGENERGY2MQTT_CONFIG	The path to the JSON configuration file (default: /etc/sigenergy2mqtt.yaml)
SIGENERGY2MQTT_LOG_LEVEL	Set the log level. Valid values are: DEBUG, INFO, WARNING, ERROR or CRITICAL. Default is WARNING (warnings, errors and critical failures)
SIGENERGY2MQTT_DEBUG_SENSOR	Specify a sensor to be debugged using either the full entity id, a partial entity id, the full sensor class name, or a partial sensor class name. For example, specifying 'daily' would match all sensors with daily in their entity name. If specified, --debug-level is also forced to DEBUG
SIGENERGY2MQTT_SANITY_CHECK_DEFAULT_KW	The default value in kW used for sanity checks to validate the maximum and minimum values for actual value of power sensors and the delta value of energy sensors. The default value is 100 kW per second, and readings outside the range are ignored.
SIGENERGY2MQTT_HASS_ENABLED	Set to 'true' to enable auto-discovery in Home Assistant.
SIGENERGY2MQTT_HASS_DISCOVERY_PREFIX	The Home Assistant MQTT Discovery topic prefix to use (default: homeassistant)
SIGENERGY2MQTT_HASS_ENTITY_ID_PREFIX	The prefix to use for Home Assistant entity IDs. Example: A prefix of 'prefix' will prepend 'prefix_' to entity IDs (default: sigen)
SIGENERGY2MQTT_HASS_UNIQUE_ID_PREFIX	The prefix to use for Home Assistant unique IDs. Example: A prefix of 'prefix' will prepend 'prefix_' to unique IDs (default: sigen). Once you have set this, you should NEVER change it, as it will break existing entities in Home Assistant.
SIGENERGY2MQTT_HASS_DEVICE_NAME_PREFIX	The prefix to use for Home Assistant entity names. Example: A prefix of 'prefix' will prepend 'prefix ' to names (default: '')
SIGENERGY2MQTT_HASS_DISCOVERY_ONLY	Set to 'true' to e xit immediately after publishing discovery. Does not read values from the Modbus interface, except to probe for device configuration.
SIGENERGY2MQTT_MQTT_BROKER	The hostname or IP address of an MQTT broker (default: 127.0.0.1)
SIGENERGY2MQTT_MQTT_PORT	The listening port of the MQTT broker (default: 1883)
SIGENERGY2MQTT_MQTT_ANONYMOUS	Set to 'true' to connect to MQTT anonymously (i.e. without username/password).
SIGENERGY2MQTT_MQTT_USERNAME	A valid username for the MQTT broker
SIGENERGY2MQTT_MQTT_PASSWORD	A valid password for the MQTT broker username
SIGENERGY2MQTT_MQTT_LOG_LEVEL	Set the paho.mqtt log level. Valid values are: DEBUG, INFO, WARNING, ERROR or CRITICAL. Default is WARNING (warnings, errors and critical failures)
SIGENERGY2MQTT_MODBUS_HOST	The hostname or IP address of the Sigenergy device
SIGENERGY2MQTT_MODBUS_PORT	The Sigenergy device Modbus port number (default: 502)
SIGENERGY2MQTT_MODBUS_INVERTER_SLAVE	The Sigenergy device Modbus Device ID (Slave ID). May be specified as a space-separated list (e.g. "1 2"). (default: 1)
SIGENERGY2MQTT_MODBUS_ACCHARGER_SLAVE	The Sigenergy AC Charger Modbus Device ID (Slave ID).
SIGENERGY2MQTT_MODBUS_DCCHARGER_SLAVE	The Sigenergy DC Charger Modbus Device ID (Slave ID).
SIGENERGY2MQTT_MODBUS_NO_REMOTE_EMS	If true, read-write sensors for remote Energy Management System (EMS) integration will NOT be published to MQTT. Default is false. Ignored if SIGENERGY2MQTT_MODBUS_READ_WRITE is false.
SIGENERGY2MQTT_MODBUS_READ_ONLY	If false, read-only entities will not be published to MQTT. Default is true.
SIGENERGY2MQTT_MODBUS_READ_WRITE	If false, read-write entities will not be published to MQTT. Default is true.
SIGENERGY2MQTT_MODBUS_WRITE_ONLY	If false, write-only entities will not be published to MQTT. Default is true.
SIGENERGY2MQTT_MODBUS_LOG_LEVEL	Set the pymodbus log level. Valid values are: DEBUG, INFO, WARNING, ERROR or CRITICAL. Default is WARNING (warnings, errors and critical failures)
SIGENERGY2MQTT_SMARTPORT_ENABLED	Enable interrogation of a third-party device for production data.
SIGENERGY2MQTT_SMARTPORT_MODULE_NAME	The name of the module which will be used to obtain third-party device production data.
SIGENERGY2MQTT_SMARTPORT_HOST	The IP address or hostname of the third-party device.
SIGENERGY2MQTT_SMARTPORT_USERNAME	The username to authenticate to the third-party device.
SIGENERGY2MQTT_SMARTPORT_PASSWORD	The password to authenticate to the third-party device.
SIGENERGY2MQTT_SMARTPORT_PV_POWER	The sensor class to hold the production data obtained from the third-party device.
SIGENERGY2MQTT_SMARTPORT_MQTT_TOPIC	The MQTT topic to which to subscribe to obtain the production data for the third-party device.
SIGENERGY2MQTT_SMARTPORT_MQTT_GAIN	The gain to be applied to the production data for the third-party device obtained from the MQTT topic. (e.g. 1000 if the data is in kW) Default is 1 (Watts).
SIGENERGY2MQTT_SCAN_INTERVAL_LOW	The scan interval in seconds for Modbus registers that are to be scanned at a low frequency. Default is 600 (seconds), and the minimum value is 300.
SIGENERGY2MQTT_SCAN_INTERVAL_MEDIUM	The scan interval in seconds for Modbus registers that are to be scanned at a medium frequency. Default is 60 (seconds), and the minimum value is 30.
SIGENERGY2MQTT_SCAN_INTERVAL_HIGH	The scan interval in seconds for Modbus registers that are to be scanned at a high frequency. Default is 10 (seconds), and the minimum value is 5.
SIGENERGY2MQTT_SCAN_INTERVAL_REALTIME	The scan interval in seconds for Modbus registers that are to be scanned in near-real time. Default is 5 (seconds), and the minimum value is 1.
SIGENERGY2MQTT_PVOUTPUT_ENABLED	Set to 'true' to enable status updates to PVOutput.
SIGENERGY2MQTT_PVOUTPUT_API_KEY	The API Key for PVOutput
SIGENERGY2MQTT_PVOUTPUT_SYSTEM_ID	The PVOutput System ID
SIGENERGY2MQTT_PVOUTPUT_CONSUMPTION	Set to 'true' to enable sending consumption status to PVOutput.
SIGENERGY2MQTT_PVOUTPUT_INTERVAL	The interval in minutes to send data to PVOutput (default: 5). Valid values are 5, 10 or 15 minutes.
SIGENERGY2MQTT_PVOUTPUT_TEMP_TOPIC	An MQTT topic from which the current temperature can be read. This is used to send the temperature to PVOutput. If not specified, the temperature will not be sent to PVOutput.
SIGENERGY2MQTT_PVOUTPUT_LOG_LEVEL	Set the PVOutput log level. Valid values are: DEBUG, INFO, WARNING, ERROR or CRITICAL. Default is WARNING (warnings, errors and critical failures)

MQTT Publish and Subscribe Topics

The topics that are published and subscribed to by sigenergy2mqtt can be found here.