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MQTT TOPICS

The data originates from D-Bus on Venus OS. Detailed spec is here. There is a bridge between D-Bus and MQTT, code & documentation here.

An example of available data is:

Topic: N/e0ff50a097c0/system/0/Dc/Battery/Voltage`
Payload: {"value": 210}

Explanation:

e0ff50a097c0         -> VRM Portal ID
system               -> Service type
0                    -> Device Instance (used when there is more than one of this service type)
/Dc/Battery/Voltage  -> D-Bus path.

On D-Bus, data is sent on change. And dbus-mqtt translates each transmission on D-Bus, called a PropertiesChanged message, to a mqtt publish().

What topics have what data?

First, note that most data comes from the system device. See explanation on the dbus wiki page for more info on that. Instance is always 0.

And that most of below paths are copied from that same dbus wiki page; and all lengthy explanations have been stripped out. So, make sure to see the dbus wiki page for details.

Battery data:

Info about all batteries available in the system is available under:

N/{portalId}/system/0/Batteries
// -> {"value": [
            {
            "soc": 100.0,
            "active_battery_service": true, // True for main battery
            "temperature": 30.0,
            "power": 472.851013184,
            "current": 8.30000019073,
            "instance": 256,
            "state": 1,
            "voltage": 56.9799995422,
            "id": "com.victronenergy.battery.ttyO0",
            "name": "BMV-702"
            }
        ]}

Solar data:

N/{portalId}/system/0/Dc/Pv/Power
N/{portalId}/system/0/Dc/Pv/Current

AC Input data (Shore / Genset) for inverter/charger aka vebus

There are three types of devices that show up on D-Bus as a com.victronenergy.vebus device:

  • Inverters. These have no AC-input, so no AC-Input current limit
  • Multis: one AC-input; connected to either shore (adjustable) or a generator (not adjustable)
  • Quattros: two AC-inputs; typically one is connected to shore, and the other to a generator

Which one you have can be determined from this path:

N/{portalId}/vebus/{vebusInstanceId}/Ac/NumberOfAcInputs
// 0 = Inverter, 1 = system with one input, 2 = system with two inputs
What input is what (shore, or generator)

The installer configures the AC-input types in the menus: Settings -> System Setup.

Then they are stored in 'localsettings', available on MQTT as:

N/{portalId}/settings/0/Settings/SystemSetup/AcInput1
N/{portalId}/settings/0/Settings/SystemSetup/AcInput2
// 0: not in use; 1: grid, 2: generator, 3: shore
Which input is currently active

Figure out which of the AC-inputs is what; so for example ACinput0 == Generator and ACinput1 == Shore. (based on the the settings above) and then look at this path:

N/{portalId}/vebus/{vebusInstanceId}/Ac/ActiveIn/ActiveInput
// Active input: 0 = ACin-1, 1 = ACin-2, 240 is none (inverting).
Where to get the readings for the AC inputs (grid / shore / generator)?

Normally we'd say go to the .system device. But the html5 app UI also wants voltage and current, which are not available on .system device. Therefore, get them straight from the .vebus service:

  • figure out which of the AC-inputs is what; so for example ACinput0 == Generator and ACinput1 == Shore.
  • find the ve.bus service (see below).

Then, use these paths:

// So, if the ActiveInput == Acinput1, then populate the Shore box with the values from these paths:
N/{portalId}/vebus/{vebusInstanceId}/Ac/ActiveIn/L1/I  <- Current (Amps) (+ L2, L3 for 3 phase)
N/{portalId}/vebus/{vebusInstanceId}/Ac/ActiveIn/L1/P  <- Power (Watts)
N/{portalId}/vebus/{vebusInstanceId}/Ac/ActiveIn/L1/V  <- Voltage (Volts)

The number of phases, for all boxes related to the vebus device can be retrieved here:

N/${portalId}/vebus/${vebusInstanceId}/Ac/NumberOfPhases

Note: For other UIs, that show only power, and also do not show generator & shore at the same time, you can take the info from these paths under system/0:

N/{portalId}/system/0/Ac/Grid/*                      <- All from the shore. TODO: check if this shouldn't be /Ac/Shore
N/{portalId}/system/0/Ac/Genset/*                    <- All from the generator.

Rest of inverter/charger data:

N/{portalId}/system/0/Dc/Vebus/Current               <- charge/discharge current between battery
                                                    and inverter/charger

N/{portalId}/system/0/Dc/Vebus/Power                 <- same, but then the power

N/{portalId}/system/0/SystemState/State              <- Absorption, float, etc.
                                                       0 - "Off" 1 - "Low power"
                                                       2 - "VE.Bus Fault condition"
                                                       3 - "Bulk charging"
                                                       4 - "Absorption charging"
                                                       5 - "Float charging"
                                                       6 - "Storage mode"
                                                       7 - "Equalisation charging"
                                                       8 - "Passthru"
                                                       9 - "Inverting"
                                                       10 - "Assisting"
                                                       256 - "Discharging"
                                                       257 - "Sustain"

N/{portalId}/system/0/Ac/ActiveIn/Source             <- The active AC-In source of the multi.
                                                       0:not available, 1:grid, 2:generator,
                                                       3:shore, 240: inverting/island mode.

N/{portalId}/system/0/VebusService                   <- Returns the service name of the vebus service.
                                                        Use that to find the control options:

Inverter/charger control:

Shore input limit

This starts with finding the service name and instance.

The VE.Bus device instance is available under: N/{portalId}/vebus/+/DeviceInstance // { value: 257 }

With above example, the instance is 257, making the prefix vebus/257.

Then the topics you are looking for to control input current limit are:

N/{portalId}/vebus/{vebusInstanceId}/Ac/In/{n}/CurrentLimit                   <- R/W for input current limit.
N/{portalId}/vebus/{vebusInstanceId}/Ac/In/{n}/CurrentLimit GetMin            <- not implemented!
N/{portalId}/vebus/{vebusInstanceId}/Ac/In/{n}/CurrentLimit GetMax            <- not implemented in mqtt
N/{portalId}/vebus/{vebusInstanceId}/Ac/In/{n}/CurrentLimitIsAdjustable

n = the AC-input. 0 = AC-input 1, and 1 = AC-input 2.

And, don't hardcode that vebus/257 ;-).

Notes:

  1. when /vebus/257/In/n/CurrentLimit is set to an invalid value, it will automatically be changed to a valid value. Some examples for setting it to an invalid value are setting it too low, or setting it to a value that doesn't match with regards to step-sizes.
  2. the Getmin is not implemented because its difficult to implement on our side: The panel frames used to communicate current limits only contain the max value. min is not included. We can only get the minimum from the active AC input. The minimum is a special case, it will change depending on the configuration of the inverter/charger, for example disabling "powerAssist" changes it.
  3. Paths for /CurrentLimit described below are only available starting from version 415 of the VE.Bus device.
Make commonly used shore input limits available as a button

The list of amperages commonly used depends on wether the system is US based or EU based. To etermine that, get the product id from:

N/{portalId}/vebus/{vebusInstanceId}/ProductId

Then, mask the Product id with 0xFF00

If the result is 0x1900 or 0x2600 it is an EU model (230VAC) If the result is 0x2000 or 0x2700 it is an US model (120VAC)

Default values for US/EU are:

USAmperage = [10, 15, 20, 30, 50, 100]
EUAmperage = [6, 10, 13, 16, 25, 32, 63]
On/Off/Charger-only control paths
N/{portalId}/vebus/257/Mode                          <- Position of the switch.
                                                           1=Charger Only;2=Inverter Only;3=On;4=Off
N/{portalId}/vebus/257/ModeIsAdjustable              <- 0: only show the mode / 1: keep it adjustable

AC Loads

Get the available number of phases:

N/${portalId}/system/0/Ac/Consumption/NumberOfPhases

Current:

N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L1/I
N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L2/I
N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L3/I

Voltage:

N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L1/V
N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L2/V
N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L3/V

Power:

N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L1/P
N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L2/P
N/{portalId]/vebus/{vebusInstanceId}/Ac/Out/L3/P

DC Loads

Voltage: N/{portalId}/system/0/Dc/Battery/Voltage
Current: power divded by voltage
Power: N/{portalId}/system/0/Dc/System/Power

Charger information

A system has chargers available if there are devices registered at /charger/:

N/+/charger/+/DeviceInstance

Then, for each charger, the following info is available:

// Name displayed is "CustomName", if available, otherwise "ProductName"
N/${portalId}/charger/${deviceInstanceId}/ProductName,
N/${portalId}/charger/${deviceInstanceId}/CustomName

N/${portalId}/charger/${deviceInstanceId}/Ac/In/CurrentLimit
N/${portalId}/charger/${deviceInstanceId}/Mode  // 1-ON, 4-OFF
N/${portalId}/charger/${deviceInstanceId}/State // Same values as system/State

N/${portalId}/charger/${deviceInstanceId}/NrOfOutputs
N/${portalId}/charger/${deviceInstanceId}/Dc/0/Current,
N/${portalId}/charger/${deviceInstanceId}/Dc/1/Current,
N/${portalId}/charger/${deviceInstanceId}/Dc/2/Current

The following properties can also be changed:

W/${portalId}/charger/${deviceInstanceId}/Ac/In/CurrentLimit
W/${portalId}/charger/${deviceInstanceId}/Mode`

Inverter information

Dbus spec for invertes here

For every inverter in the system show an element in the ui. Inverters can be found on D-Bus under two paths:

  • com.victronenergy.inverter (<-- see simulation H in venus-docker repo)
    • N/+/charger/+/DeviceInstance
  • com.victronenergy.vebus, with /Ac/NumberOfInputs == 0 (<-- see simulation A in venus-docker repo)
    • N/+/vebus/+/DeviceInstance

The element should contain this information:

  • The switch (on/off/eco); it wil always be available on D-Bus
  • The state (On, Off, Eco, alarm; which can be overload or low battery)
  • AC output voltage, current. Not power; because its not available for all models.

See Inverter.js and Inverters.js for implementation.