MQTT

MQTT Topics

The base topic, as configured in the web GUI is prepended to all following topics. Serial will be replaced with the serial number of the respective device.

General topics

Topic	R / W	Description	Value / Unit
dtu/ip	R	IP address of OpenDTU	IP address
dtu/hostname	R	Current hostname of the dtu (as set in web GUI)
dtu/rssi	R	WiFi network quality	db value
dtu/status	R	Indicates whether OpenDTU network is reachable	online / offline
dtu/uptime	R	Time in seconds since startup	seconds

Inverter total topics

Enabled inverter means, that only inverters with "Poll inverter data" enabled are considered.

Topic	R / W	Description	Value / Unit
ac/power	R	Sum of AC active power of all enabled inverters	W
ac/yieldtotal	R	Sum of energy converted to AC since reset watt hours of all enabled inverters	Kilo watt hours (kWh)
ac/yieldday	R	Sum of energy converted to AC per day in watt hours of all enabled inverters	Watt hours (Wh)
ac/is_valid	R	Indicator whether all enabled inverters where reachable	0 or 1
dc/power	R	Sum of DC power of all enabled inverters	Watt (W)
dc/irradiation	R	Produced power of all enabled inverter stripes with defined irradiation settings divided by sum of all enabled inverters irradiation	%
dc/is_valid	R	Indicator whether all enabled inverters where reachable	0 or 1

Inverter specific topics

serial will be replaced with the serial number of the inverter.

Topic	R / W	Description	Value / Unit
[serial]/name	R	Name of the inverter as configured in web GUI
[serial]/device/bootloaderversion	R	Bootloader version of the inverter
[serial]/device/fwbuildversion	R	Firmware version of the inverter
[serial]/device/fwbuilddatetime	R	Build date / time of inverter firmware
[serial]/device/hwpartnumber	R	Hardware part number of the inverter
[serial]/device/hwversion	R	Hardware version of the inverter
[serial]/status/reachable	R	Indicates whether the inverter is reachable	0 or 1
[serial]/status/producing	R	Indicates whether the inverter is producing AC power	0 or 1
[serial]/status/last_update	R	Unix timestamp of last inverter statistics udpate	seconds since JAN 01 1970 (UTC)

AC channel / global specific topics

Topic	R / W	Description	Value / Unit
[serial]/0/current	R	AC current in ampere	Ampere (A)
[serial]/0/efficiency	R	Ratio AC Power over DC Power in percent	%
[serial]/0/frequency	R	AC frequency in hertz	Hertz (Hz)
[serial]/0/power	R	AC active power in watts	Watt (W)
[serial]/0/powerdc	R	DC power in watts	Watt (W)
[serial]/0/powerfactor	R	Power factor in percent	%
[serial]/0/reactivepower	R	AC reactive power in VAr	VAr
[serial]/0/temperature	R	Temperature of inverter in degree celsius	Degree Celsius (°C)
[serial]/0/voltage	R	AC voltage in volt	Volt (V)
[serial]/0/yieldday	R	Energy converted to AC per day in watt hours	Watt hours (Wh)
[serial]/0/yieldtotal	R	Energy converted to AC since reset watt hours	Kilo watt hours (kWh)

DC input channel topics

[1-4] represents the different inputs. The amount depends on the inverter model.

Topic	R / W	Description	Value / Unit
[serial]/[1-4]/current	R	DC current of specific input in ampere	Ampere (A)
[serial]/[1-4]/name	R	Name of the DC input channel as configured in web GUI
[serial]/[1-4]/irradiation	R	Ratio DC Power over set maximum power (in web GUI)	%
[serial]/[1-4]/power	R	DC power of specific input in watt	Watt (W)
[serial]/[1-4]/voltage	R	DC voltage of specific input in volt	Volt (V)
[serial]/[1-4]/yieldday	R	Energy converted to AC per day on specific input	Watt hours (Wh)
[serial]/[1-4]/yieldtotal	R	Energy converted to AC since reset on specific input	Kilo watt hours (kWh)

Inverter limit specific topics

cmd topics are used to set values. Status topics are updated from values set in the inverter.

Topic	R / W	Description	Value / Unit
[serial]/status/limit_relative	R	Current applied production limit of the inverter	% of total possible output
[serial]/status/limit_absolute	R	Current applied production limit of the inverter	Watt (W)
[serial]/cmd/limit_persistent_relative	W	Set the inverter limit as a percentage of total production capability. The value will survive the night without power. The updated value will show up in the web GUI and limit_relative topic immediatly.	%
[serial]/cmd/limit_persistent_absolute	W	Set the inverter limit as a absolute value. The value will survive the night without power. The updated value will set immediatly within the inverter but show up in the web GUI and limit_relative topic after around 4 minutes. If you are using a already known inverter (known Hardware ID), the updated value will show up within a few seconds.	Watt (W)
[serial]/cmd/limit_nonpersistent_relative	W	Set the inverter limit as a percentage of total production capability. The value will reset to the last persistent value at night without power. The updated value will show up in the web GUI and limit_relative topic immediatly. The value must be published non-retained, otherwise it will be ignored!	%
[serial]/cmd/limit_nonpersistent_absolute	W	Set the inverter limit as a absolute value. The value will reset to the last persistent value at night without power. The updated value will set immediatly within the inverter but show up in the web GUI and limit_relative topic after around 4 minutes. If you are using a already known inverter (known Hardware ID), the updated value will show up within a few seconds. The value must be published non-retained, otherwise it will be ignored!	Watt (W)
[serial]/cmd/power	W	Turn the inverter on (1) or off (0)	0 or 1
[serial]/cmd/restart	W	Restarts the inverters (also resets YieldDay)	1

Victron MPPT topics

General

Topic	R / W	Description	Value / Unit
victron/[serial]/PID	R	Product description	text
victron/[serial]/SER	R	Serial number	text
victron/[serial]/FW	R	Firmware number	int
victron/[serial]/LOAD	R	Load output state	ON / OFF
victron/[serial]/CS	R	State of operation	text e. g. "Bulk"
victron/[serial]/ERR	R	Error code	text e. g. "No error"
victron/[serial]/OR	R	Off reasen	text e. g. "Not off"
victron/[serial]/MPPT	R	Tracker operation mode	text e. g. "MPP Tracker active"
victron/[serial]/HSDS	R	Day sequence number (0...364)	int in days

Battery output

Topic	R / W	Description	Value / Unit
victron/[serial]/V	R	Voltage	Volt (V)
victron/[serial]/I	R	Current	Ampere (A)

Solar input

Topic	R / W	Description	Value / Unit
victron/[serial]/VPV	R	Voltage	Volt (V)
victron/[serial]/PPV	R	Power	Watt (W)
victron/[serial]/H19	R	Yield total (user resettable counter)	Kilo watt hours (kWh)
victron/[serial]/H20	R	Yield today	Kilo watt hours (kWh)
victron/[serial]/H21	R	Maximum power today	Watt (W)
victron/[serial]/H22	R	Yield yesterday	Kilo watt hours (kWh)
victron/[serial]/H23	R	Maximum power yesterday	Watt (W)

Pylontech battery topics

Topic	R / W	Description	Value / Unit
battery/settings/chargeVoltage	R	Voltage	Volt (V)
battery/settings/chargeCurrentLimitation	R	BMS requested max. charge current	Ampere (A)
battery/settings/dischargeCurrentLimitation	R	BMS requested max. discharge current	Ampere (A)
battery/stateOfCharge	R	State of Health	%
battery/stateOfHealth	R	State of Charge	%
battery/dataAge	R	How old the data is	Seconds
battery/voltage	R	Actual voltage	Volt (V)
battery/current	R	Actual current	Ampere (A)
battery/temperature"	R	Actual temperature	°C
battery/alarm/overCurrentDischarge	R	Alarm: High discharge current	0 / 1
battery/alarm/underTemperature	R	Alarm: Low temperature	0 / 1
battery/alarm/overTemperature	R	Alarm: High temperature	0 / 1
battery/alarm/underVoltage	R	Alarm: Low voltage	0 / 1
battery/alarm/overVoltage	R	Alarm: High voltage	0 / 1
battery/alarm/bmsInternal	R	Alarm: BMS internal	0 / 1
battery/alarm/overCurrentCharge	R
battery/warning/highCurrentDischarge	R	Warning: High discharge current	0 / 1
battery/warning/lowTemperature	R	Warning: Low temperature	0 / 1
battery/warning/highTemperature	R	Warning: High temperature	0 / 1
battery/warning/lowVoltage	R	Warning: Low voltage	0 / 1
battery/warning/highVoltage	R	Warning: High voltage	0 / 1
battery/warning/bmsInternal	R	Warning: BMS internal	0 / 1
battery/manufacturer	R	Manufacturer	String
battery/charging/chargeEnabled	R	Charge enabled flag	0 / 1
battery/charging/dischargeEnabled	R	Discharge enabled flag	0 / 1
battery/charging/chargeImmediately	R	Charge immediately flag	0 / 1

Huawei AC charger topics

Topic	R / W	Description	Value / Unit
huawei/cmd/limit_online_voltage	W	Online voltage (i.e. CAN bus connected)	Volt (V)
huawei/cmd/limit_online_current	W	Online current (i.e. CAN bus connected)	Ampere (A)
huawei/cmd/limit_offline_voltage	W	Offline voltage (i.e. CAN bus not connected)	Volt (V)
huawei/cmd/limit_offline_current	W	Offline current (i.e. CAN bus not connected)	Ampere (A)
huawei/cmd/mode	W	Controls GPIO output pin to switch slot detect	0 (off) / 1 (on) / 2 (set automatically depending on online_current value) / 3 (set automatically based on Power Meter reading )
huawei/data_age	R	How old the data is	Seconds
huawei/input_voltage	R	Input voltage	Volt (V)
huawei/input_current	R	Input current	Ampere (A)
huawei/input_power	R	Input power	Watt (W)
huawei/output_voltage	R	Output voltage	Volt (V)
huawei/output_current	R	Output current	Ampere (A)
huawei/max_output_current	R	Maximum output current (set using the online limit)	Ampere (A)
huawei/output_power	R	Output power	Watt (W)
huawei/input_temp	R	Input air temperature	°C
huawei/output_temp	R	Output air temperature	°C
huawei/efficiency	R	Efficiency	Percentage

Power Limiter topics

Topic	R / W	Description	Value
powerlimiter/cmd/mode	W	Power Limiter operation mode	see below
powerlimiter/status/mode	R	Get Power Limiter operation mode	see below

Setting any of these modes through MQTT has no effect if the Power Limiter is disabled by configuration in the web application. The Power Limiter will stay off in that case.

Three modes are implemented:

• 0 - Normal operation: The Power Limiter works as configured through the web application.
• 1 - Fully disable: The inverter is shut down and the Power Limiter stops operating, as if it was disabled in the web application.
• 2 - Unconditional Solar Passthrough: The power limit is set such that all solar power (adjusted for efficiency) is fed into the home. This is done irrespective of grid consumption and without consuming energy from the battery, which is the key difference to the regular Power Limiter Solar Passthrouh feature. Essentially, the inverter mimics the behavior of a traditional, non-smart inverter. This can be particularly useful in scenarios where solar power is better stored elsewhere, such as in an electric car.