Multiplus-II Image


Enabling forced Export to grid with 3 phase Mutliplus 2. UK

I am considering installing a 3 x 48/5000/70-50 multiplus 2 in 3 phase configuration (UK) with a large battery to enable profitable export to grid at times of high income. My understanding that this is difficult without NodeRed, but possible with NodeRed. Am I correct in this assumption? Further, does the NodeRed flow work with a 3 phase setup? I currently use NodeRed, but cannot play with the Victron flows as you need a physical inverter connected to the VenusOS to progress. Thanks in anticipation.

brookydave asked
Jason - UK answered ·

1 Answer

Unstable Modbus/TCP connection to Multiplus 2 GX

I'm operating a Multiplus 2 GX with activated Modbus TCP (see Picture 1). A separate Raspberry Pi which is running Node-Red connects to the Modbus/TCP endpoint. The modbus TCP connection is used to read information from the Multiplus and to control the ESS based on my dynamic energy tariff. While the communication itself works quite well, the connection to the Multiplus is unstable and breaks regularly (see Picture 2). To be able to reconnect I have to move the the modbus connection in the editor slightly and re-deploy in Node-Red. I've tried to optimize the connection settings (see Picture 3) towards the Multiplus but without any impact.

From my current perspective there is no reason for the instability. Within the VRM portal there are no connection issued and the state of the Multiplus is reported without data gaps or connection issues.

Picture 1


Picture 2


Picture 3


sascha-brinkmann asked
sascha-brinkmann answered ·

2 Answers

Node red : Multiplus II primary relay

Dear all,

My installation consists of solar panels, Pylontech batteries, a Multiplus II, and a Solar Charger MPPT 450/100. This set is controlled by a CERBO GX. I have installed Venus Large and Node-RED.

I already control a hot water tank from a CERBO GX relay programmed with Node-RED.

I would also like to program the primary relay of the Multiplus II via Node-RED. I can do this with the Relay Assistant but cannot find it with Node-RED. Do you have an idea?


jeromed asked
Dirk-Jan Faber commented ·

3 Answers

AUX1 / AUX2 am MultiPlus-II Nutzung in Red-Node als Digital-In

Ich hab einen Victron Multiplus-II GX (Firmware 2.92).

Dieser hat zwei Ports (AUX1 und AUX2) die eigentlich (wenn ich die verfügbaren Posts hier korrekt interpretiere) relativ frei verwendet werden können. Auf meinem MP2 ist nur ein Assistent installiert (ESS).

Ich hab das Large-Image mit aktivem Node-Red im Einsatz.

Im speziellen möchte ich einen externen, potentialfreien Kontakt über (z.B.) AUX2 in einer NodeRed Automation (Flow) verwenden. Ich will AUX2 also einfach als Digital-In verwenden (also z.B. AUX2 per Schalter auf GND legen).

Geht das? - Wenn ja wie?

it-guru asked
Chris Hill commented ·

3 Answers

Node-Red running on Venux GX is not loading in browser, and restarting several times a day

As per the question title, I have Node-Red running on a Venus GX, it has been running just fine for over a year, I've been gradually adding functionality and it looks like something might have been messed up.

The flow is still running, I can see the results of the flow broadcast to my MQTT broker and logged on my dashboard - however I cannot open up the Node-Red flow in my browser. I've tried locally (http://192.168.86.XX:1880/) and via the VRM with the same result (perpetual loading, or sometimes the following stage: (even after left for >20 mins)


I've tried stopping and starting the Node-Red instance via the Remote Console, it successfully stops and starts it but doesn't help me access it.

Are there any solutions to fix? Ideally to access the stopped flow to make modifications to allow debugging. One thing I want to try is dramatically reduce the load in the flow by reducing message frequency, some of which are occuring far more frequently than needed.

homestorage-77 asked
Stefanie (Victron Energy Staff) answered ·

1 Answer

node red automate inverter limits

I have been delving more into node red to try make ESS a bit smarter particularly for those of us in areas with lots of loadshedding.

One of the use cases was for higher loads or poorer PV generation, where you want to top-up batteries faster but don't necessarily want to do that from grid.

I created a flow that allows you set an inverter limit, a target SOC and/or a timer where the limit will be active.

So you can choose to get to X SOC or however far it gets in Y hours and minutes.

After that it disables the limit and carries on.

I am debating adding a cron like scheduler so you can choose to set different limits at different times - work in progress.


Anyway. Flow attached, for anyone interested.

nickdb asked

0 Answers

Force charge/discharge of Multiplus using VenusGX & Node-Red

What am I trying to achieve?

Charge the battery, or discharge the battery based on external input (via MQTT, but ultimately based on variable electricity tariff status)

I am up and running in Node-Red on the Venus GX 'large' image and am able to set the Multiplus to the following modes;


However if I set the multiplus to 'charger only' it obviously won't charge if I'm not in a scheduled charge slot.

If I set up a scheduled charge slot to be active at all times, then I can charge / not charge on demand by setting the 'Disable Charge' flag to either 0 or 1.


However when in the 'don't charge' state, it also won't discharge the battery as I'm in a scheduled charging slot.

I've tried setting the AC power setpoint instead of charging within a scheduled charging time, but it doesn't seem to do anything if I try the following;


Can anyone offer any recommendations on how I can switch between charging or discharging to meet my requirement?

homestorage-77 asked
homestorage-77 answered ·

2 Answers

Multiplus-II ESS Ertragsprognose über Node Red

Hallo zusammen,

ich will über Node Red eine Ertragsprognose für den Folgetag realisieren und auf dieser Basis den Mindest-SOC schon am Abend setzen, damit der Akku nicht dauerhaft leergelutscht da steht.

Das BatteryLife gefällt mir nicht, da es ja nur im Nachgang regelt, nicht auf Wetterschwankungen schnell reagiert und der Akku u.U. mit Netzstrom auf einen höheren SOC geladen wird.

Globalstrahlung des Folgetages habe ich soweit von einem Wetterdienst ausgelesen, aber welche Einflussgrößen gibt es dann auf die Mindest-SOC? Ich stehe da derzeit ein wenig auf dem Schlauch, vielleicht wäre das ein interessantes Community-Projekt?

Hier wäre mein Flow zum Auslesen der Globalstrahlung des aktuellen und des Folgetages.

chrisu asked
hominidae commented ·

4 Answers

Reduce charge current based on SOC Multiplus

I want to reduce the charge current from the Multiplus II based on SOC from smartshunt using NodeRec via Cerbo.

I have tried in NodeRed but cannot find a setting to change charge current.
Have anyone tried this?
I see that I can reduce charge current via an analog in and use an assistant in the MP, but this is not a desired solution.

Any advice?

slapperia asked
Alexandra commented ·

4 Answers

Two Multiplus II in series


I am working on installing a Multiplus II 48/5000 at my home, where I already have an on-grid photovoltaic inverter SMA Sunny Boy 4kW and I have some questions I haven't found answers anywhere:

1. Is it possible to install two Multiplus II inverters in series (one of them connected to the other critical loads output) with non-shared batteries? How should I configure them? That would enable me to add a new Multiplus II in the future with another new battery on grid-parallel mode connected to first Multiplus II critical loads output.

1.1 If 1. question is possible, should I configure second one to not exporting to grid? Or first one could use frequency shifting (or similar) to control how much energy could export the second one?

1.2 Continuation of 1.1 question. Would be possible to have SMA Sunny Boy 4kW connected to the same critical loads output than second Multiplus II, having both controlled by frequency shifting? Or that is not possible as maximum power would exceed Multiplus II maximum power?

It appears a similar configuration could be done by using CerboGX large firmware, to be able to use Node-red to control some inputs:
- first Multiplus II critical loads frequency (could be updated depending on first Multiplus II is able to receive more power from critical loads or it cannot accept many more
- first Multiplus II AC In grid status (availabe/not available)
And to be able to control some things:
- second Multiplus II power exportation limit, being configure to 0 power exporattion into second Multiplus II if grid on first Multiplus II is disconnected

I've seen some other questions about similar solutions, but they were trying to control batteries load between two Multiplus II at the same time at the same battery load. I'm not interested on that. What I'm looking for is to:
1. If second Multiplus II (with AC In connected to first Multiplus II critical loads AC OUT) has batteries fully loaded, then it will share power with the other one if the other requires it; if the other doesn't require it and external grid is connected, power could be exported to grid; and if the other doesn't require it and external grid is disconnected, 0 power export should be configured into second Multiplus II
2. If first Multiplus II (connected to grid and with second Multiplus II connected to it's critical loads AC OUT) has batteries fully loaded, if second Multiplus II requires power, first Multiplus II can provide that power as if it were coming from real grid

tcircuns asked
Mariusz Zieliński answered ·

2 Answers

Obligation passage consuel installations semi-autonomes


Une question ambiguë sur le passage obligatoire ou pas du consuel.

Installation : Multiplus, panneaux solaires, MPPT. Toute la consommation sur le OUT du multiplus, et le réseau public sur IN.

Grâce à node-red, nous programmons le multiplus pour de pas utiliser du tout le réseau public quand le niveau de batterie est suffisant. Dans ce cas, un réseau indépendant est généré et le réseau public n'est pas du tout utilisé (relais IN ouvert dans le multiplus). En cas de batterie faible, le multiplus ferme le relais IN, laisse passer le réseau pour alimenter les consommateurs et recharge les batteries. Il se comporte comme un fil pour alimenter les consommateurs et comme un simple chargeur (il n'a pas le droit d'injecter sur le réseau).

Sur une situation comme ça où l'installation est soit déconnectée du réseau, soit vue comme un consommateur lambda, le passage du consuel reste-t-il obligatoire ?

C'est une question ambiguë car cela dépend de la programmation...

Peut-être que quelqu'un de ce forum s'est déjà posé la question ?

(Une installation 100% déconnectée du réseau ne nécessite pas leur passage)

Merci d'avance,


voltino asked
Thierry Cortassa (Victron Energy Staff) answered ·

3 Answers

Node red, ideas to force AC2 out on with grid failure

Fairly sure the answer is no, I am trying to find a way to force AC2 out on during grid failure via node red dashboard.

The current nodes don't seem to have this ability and the assistant in the multi is cumbersome.

Would be cool to be able to control that relay via node red.

nickdb asked
biff-trotters answered ·

2 Answers

how to disable Multiplus 2 charger from NodeRed

Hello together

and many thanks for the venus OS port to raspberry pi and also the large image with node red. Great work!

So here's an overview over my project:

I already have a PV on the roof and some different battery and inverter in the house which is running fine. Also we have an EV which can be charged while the sun is shining. But usually the car is on tour when there is sun on the roof. Therefor I'm building a kind of energy buffer before the wallbox using a Multiplus II 48-5000-70 and some LiFePo4 batteries with BMS in the garage. The Multiplus is connected to the house grid via the input and the wallbox is connected on output 1.

So the plan is, when the house battery is full and the energy goes to the grid I want to load the garage battery with the Multiplus charger and load the EV from this battery when it comes home until the garage battery is empty. Then I want to switch back output to input. So far I manages to adjust the charge intensity to follow the power coming from the roof. But I did not manage to stop the charger completely. I only can deactivate the whole Multiplus.

At the moment I do not have any assistant running.

Maybe someone can give me a hint how to implement this.

Thanks a lot!


tazinblack asked
tazinblack edited ·

1 Answer

setting up multiplus for solar priority with external grid-linked solar?

Due to irritating conditions with my grid provider, I can't touch my grid-linked inverters - they can't be moved behind my multiplus-II or the grid provider will terminate my feed-in contract and replace it with a very rubbish one..

So - my question..

I have two inverters (physically separate sets of panels) feeding the grid, I have rs485 metering on the solar feed to grid as well as the overall grid. I am happy and allowd to feed to grid from the inverters, but not the multiplus (else the above feed-in rate change), but want to prioritise battery charging and self-consumption.

What is the best way to do this? I plan to setup a Raspberry Pi with Venus OS and the Node-red image.


Bret Watson asked
matt1309 edited ·

2 Answers

No Output nodes available on multiplus

Hi! Just started a new Node red system on a Cerbo with a Multiplus -II 3000.

I've used both Node red and Multiplus-II before but with this installation its fighting back.

I can read input nodes from the multiples just fine, but when I try to use an output node on it, there's is none. The Solar charge output node works just fine.

What am I missing? The firmware is 481 (Newest is 489)

Skærmbillede 2021-11-02 kl. 13.55.54.png

philipr asked
philipr answered ·

2 Answers

17 Posts
2178 Users

Topic Experts

3630 Points
3174 Points