martin-m avatar image
martin-m asked

[Feature Request] Ability to operate a MultiPlus II as a charger only


As an installer I want to be able to integrate an external generator (AC) as smooth as usual using Victron components without negative side effects to the existing installation.

Imagine an installation like this:

Existing ESS installation e.g. 3-phase System represented by 3 MultiPlus II, a Venus device, a Fronius PV Converter behind the Multis (with enabled MG50 / need for frequency shifting) and one or multiple MPPTs connected to a BYD battery

As charging device I want to use a MultiPlus II as a charger only - therfor the Multi would only be connected to the venus device by VE.bus, to the generator on the AC IN, and to the battery.

This MultiPlus should affect the existing ESS System (which provides the AC power for consumption) in the same way as a MPPT does.

Integrating the generator, connected to the additional Multi, should have all advantages the existing system already has, such as:

  • Optimal battery charging
    • Venus device knows about the charger and can take its power into account
    • the charger receives the currently allowed maximum charge current and can charge according to the BMS / DVCC
  • available data of the charger on DBUS/MQTT/Modbus
  • Displaying the charger in its role as a generator and its provided power in the same way a Quattro does


As read in the community forum and responses from my very experienced and helpful dealer, there are several possibilities to integrate a generator into an existing MultiPlus II ESS System, but in my opinion all of them are not as smooth as I am used to from Victron. They are also do not provide the upper listed advantages (And I'm pretty sure that the system design and the architecture could be enabled to do this).

This is an implementation detail, but It could work like this:

The additional Multi needs to be configured in ve.configure for accepting the generator anyway.

Either the Multis role could be configured at the venus device directly as it is usual e.g. for grid meters or an additional assistant could be created sth. like an "Generator integration" Assistant (unfortunately my "finding good names" gene is broken).

Having this assistant running on the additional Multi, the venus device knows its role and the assistant could also disable features of the Multi which are not required or must not be active in this role.

For sure this use case could be extended for example by integrating a 3-Phase Generator using 3 additional Multis, ...

While searching the forum I saw that a lot of community members have a similar demand.

It would be great if a feature like this would be available in upcoming releases.

Maybe you could give some Feedback.

I'm much more confident with software, control processes and low-voltage discrete current, so please excuse if there are technical restrictions which I do net see right now.

Best regards,


Multiplus-IIVenus OSGeneratorsystem designfeature request
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dafyddhirst avatar image dafyddhirst commented ·

This feature would make my life so much easier. for multi's and quatro's

We regally want to take a "dirty" ac supply to charge batteries direct controlled via DVCC thus not affecting quatro's providing output.

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dafyddhirst avatar image dafyddhirst commented ·
Has this gone anywhere did you manage to get it working?>
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1 Answer
david-callebaut avatar image
david-callebaut answered ·

The multiples do work in stand alone. I added a shunt in the DC wiring to allow the system to know where the power is coming from. But it would be nice to see it in the VRM as a DC couple charger. Setting the role of generator, what I have done in the shunt.videocapture-20231127-030822.jpg

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Related Resources

Additional resources still need to be added for this topic

MultiPlus Generator FAQ

GX - Generator auto start/stop

Automatic Generator start/stop

 Hybrid Generators

Virtual switch - Generator start/stop

Victron Venus OS Open Source intro page

Venus OS GitHub (please do not post to this)

MultiPlus-II Product page 

MultiPlus-II Manual

MultiPlus-II 230V Datasheet 

VE.Bus Error codes

Additional resources still need to be added for this topic

The feature requests topic tag can help Victron R&D find feature suggestions for products. 

There are many factors that go into the Victron product roadmap, and feedback from end-users can help.