VE.Bus Image


Serial interface of Victron Phoenix Combi

Is there someone that share information on the serial interface of Victron Phoenix Combi units, besides what can be found in the manual? (screenshots below). Is this serial bus the same as VE.Bus? Are there any of the Victron accessories, such as for example the VE.BUS to NMEA2000 adapter, that can be connected to this bus?



Tobias asked
Tobias answered ·

1 Answer

VE.Bus low battery alarm, why?

I am getting Low Battery warning at a voltage that is different than configured in the settings. The pre-alarm is set to 10.9V, the ESS assistant is configured to do a cut-off at 12V@0.005C, yet, I am getting alarms when voltage drops below 12.25V at a much higher discharge rate. The battery monitor Voltage reading = VE.Bus DC Voltage reading so it doesn't look like a cabling issue.

What am I missing?

I am using VE.Bus firmware 465.






wrietveld asked
Leslieanne answered ·

3 Answers

Smart Lithium, VE.Bus and IP22 Charger

I've been told by my distributor that I don't need a relay to cut off the charger in the event of low temperature because the battery will do this automatically. All the schematics I've seen show a separate relay switched by charger disconnect.

Is the distributor correct?

Ragerty asked
WKirby answered ·

1 Answer

Victron Connect and Venus to get access to MultiPlus


I have a BMV712, MPPT all connected via VE Direct to Rpi with VenusOS.

I have also connected via a USB MK3 cable a Multiplus which is plugged into the Rpi.

If I then use Victron Connect App to connect to the wireless of the RPi on Venus OS it can detect the BMV and MPPT via the Venus - but it doesnt see any information from, or detect the Multi.

Is there a reason the VenusOS doesnt pass through the information coming in from the Multi?



bigal asked
Vance Mitchell answered ·

2 Answers

Gateway for Phoenix to communicate of CAN with Orion BMS

I'm looking for experience around controlling Victron inverters over CANBUS. I was told by Orion that their Jr BMS could shut down discharge to protect my battery over CAN, but would likely need some sort of gateway.

Chris Knauf asked
WKirby answered ·

1 Answer

Intermittent VE.Bus Low Battery Warnings, but DC Volt is OK?!



I think, but I’m not sure, that the “VE.Bus System” listed above in the alerts is probably referring to a Multiplus II unit. I keep seeing intermittent warnings like this for no apparent reason. All Physical connections seem fine and actual battery voltage is nominal.


2 x Ve.Can MPPT working together in parallel

1 x Networked CCGX

1 x 712 battery monitor
1 x Latronics LS-5048 Inverter (5kVa 48V) as the primary inverter

1 x Multiplus II (to be used as a 70A battery charger)

All the Victron gear is communicating with each other perfectly.

I have shared voltage sense turned ON

The Multiplus isn’t always charging the batteries (in charger mode) when the generator automatically starts up so we have it switched to inverter/charger mode and that’s working as a charger even though it’s wasteful being left ON all day and night with no inverter loads.

Q. 1. What is this alert referring too usually?

Q.2. Does anyone know why the charger mode wouldn’t be working but the inverter/charger mode does work to charge the batteries when the generator runs? (Sometimes there are no Led lights on the Multiplus II)

Q. Are intermittent alerts like this normal?

EcoWorld asked
EcoWorld commented ·

1 Answer

BMV-712 V.E bus connection to CCGX


I have a CCGX that somehow isn't able to connect the BMV-712.

The V.E bus cable between BMV-712 and CCGX is 0,3m with one side right angle.

BMV-712 has a 10~15m UTP cable to shunt.

CCGX has a 10~15m UTP cable to the Multiplus 12/3000/120-50.

Connection between CCGX and multiplus is OK.

Connection between BMV-712 and shunt is OK.

When i press the "REDETECT" on the system setup on CCGX, it seem to find the BMV-712, but it doesn't connect it.

On the CCGX battery monitor page the BMV-712 information "flicker" on the measurements about every 10sec.

I haven't yet connected the CCGX to internetrouter.

What's the possible reason that the BMV-712 cannot connect to CCGX?

Jens Martin Gunnestad asked

0 Answers

Orion-TR Smart 12/12 30 Charge Disconnect Question

Hi there,

i just purchsed a Orion-TR smart 12/12 30A isolated to istall it into my Van. I would like to enable low temprature charge disconnect as my lithiums could get below 5 degrees from time to time.

The manual states that i should connect it with a "Isolated remote ON/OFF cable" to the charge discconect of the VE.Bus BMS. Unfortunately i cannot find this kind of cable anywhere, could anyone point me in to the exact cable i need? Also, could this special cable be replaced with a simple wire from the VE.Bus BMS charge disconnect to the H-Pin of the Orion-TR?

As an alternative, could i also connect the VE.Bus BMS charge disconnect to the COM Port of my BMV712 and then connect the NC relay of the BMV712 to the H-Pin of the Orion-TR in order to remotely turn of the Orion-TR in case of low temperature?

best regards,


lofy asked
lofy commented ·

1 Answer

VE.Bus Error 5 Overvoltage on AC-Out

Setup (in an RV):

* 2x MultiPlus 24/3000/70-50 120V set up in master-slave configuration
** One each connected to a circuit breaker panel
* SmartSolar MPPT 150/70
* Color Control GX
* BMV-712

AC panels have loads distributed across them. Included among these are two RV aircon units, with soft-start capacitors added. When I run a specific RV aircon unit, which is on one panel, and another high-wattage device on the other panel, I get VE.Bus Error 5 and the accompanying 30-second shutdown of all AC loads.

Testing so far:

* Seems to be centered around the interaction between the inverters, one of the aircon units, and the solar system.
* Only happens when inverting. When on shore power, no issues.
* Seems to only happen when the compressor on the AC comes on.
* Second AC unit does not appear to generate the problem.
* Load at the time is anywhere from 1600 - 3000 W, depending on what I have running. Seems to initially require me to put a heavy load on the system, then I can get it to happen with solely the AC unit in operation.
* Slave unit always displays the fault. This inverter drives the aircon unit that I can generate the fault with.
* Have not tried cutting out the PV controller far have only cut the panels out (400A panel cutout switch, 80A controller cutout switch)

Any ideas appreciated.

malcolmdmoore asked
malcolmdmoore edited ·

1 Answer

Why won't my Quattros deliver rated charging power?

Over the last year, I've had three different Quattros installed with my LiFePO4 off grid system:

Quattro 48/15000/200,

Quattro 48/3000/35 120V,

and just today, a new Quattro 48/5000/70 120V.

I can make none of these Quattros charge my battery at their rated values (200A, 35A, 70A respectively).

The new Quattro 48/5000/70 120V is the latest example of this. When it is started up, cold, it ramps from 0A to 61A, but it will never attempt any higher. Shore current limit is set to 50A, and this is a 53.5V battery that is being charged, so there should be 50A * 120V / 53.5V = 112A of shore capacity.

The battery in this case is well below the absorption threshold, and the Quattro is configured for maximum charge current (70A) in VEconfigure.

The ambient air temperature around the Quattro is roughly 10C today.

The delta between the Vsense pair and the charging cables is 0.20V at the peak 61A charging, so the stated 1.0V maximum delta is not being reached. (Calculated cable resistance is 5mOhm.)

It even takes the Quattro a few minutes before the fan spins up to cool the unit. At no point will it attempt its rated value.

I observe a slightly different, but similar, phenomenon with my 15KVA unit. That unit is rated to 200A, and when it is cold and enters bulk charging, it will begin at 190A for about four minutes. It then drops suddenly and in a characteristic curve to a stable charging current of roughly 150A, which is only 75% of its rated value. A sample graph of the charging current is here:


In summary: my units don't deliver their rated charge under any normal conditions, and I can't figure out why. Is this simply what we should expect in terms of performance from these units? Should I consider returning the Quattro 48/5000 120V since it will seemingly never even attempt to charge at 70A?

ben asked
ben commented ·

2 Answers

Why CCGX cannot find VE.Bus?

I wonder if anyone can help me solve this riddle - I think something is broken:

Set-up: 2 x 10 kVA 48 V Quattro (2653433); CCGX (v2.54) ; 1 x SmartSolar Chargers MPPT (v1.06); 4 x BYD B-Pro 13.8kWh batteries and ESS with grid-tie enabled.

The Quattro and BYD batteries were working seamlessly together. but now they don't.

Quattro communicates with my computer but not from CCGX, sometimes works sometimes not, it confused me.

Resetting Quattro to default and reconnecting to CCGX as suggested by local distributor does not resolve the problem. Neither reconfiguring the Quattro.

The remote VEConfigure use to work but now fails during download: "

An error occurred during the downloading process.

Error Message: 'No VEBus product was found'

Error: mk2vsc-33" . I don't know what this means and have not been able to make it go away.

In desperation, I tried to re-upload the firmware. I did it without any issue.

I suspect these problems are related to one component malfunctioning most likely is the CCGX.

I would really appreciate any help.

Aydin Sadrzadeh asked
Aydin Sadrzadeh commented ·

1 Answer

Overload L1 on VE bus system

I often have that alarm cleared about 30s later. Last time yesterday at 18:47, maybe at the starting time of my washing machine, but not sure. Does not alarm me but I woul like to understand! My setup:

- Off grid, 2kWp on my roof + 23kWh lead batteries.

- 2 solar MPPT 150/65, 1 multiplus 24/5000/230

- BMV712, CCGX

Around the time of alert, exact time to be checked I am normally on my local sun time (UT+28m) but VRM may have some other tim:

  • 17:39: -0.40
  • 17:48: -121.00
  • 18:06 -7.07
  • 18:24 -24.90
  • 18:33 -5.90
  • 18:51 -3.60
  • 19:10 -6.7
  • 19:19 -124.60
  • 19:37 -128.00
  • 19:55 -8.10

Any idea?

Lionel SEYDOUX asked
ejrossouw commented ·

3 Answers

Quattro with Cerbo resetting every 24hrs

My 48/10000/140-2x100 Quattro (Firmware 430) is resetting every 24 hrs or so. It is on shorepower AC1, with the batteries SOC at 99% and set to UPS. There is no shore power disruption but the Quattro shuts down all power.

The only change in the system is, I switched from a CCGX to a Cerbo GX with a Color Touch 50 last week. The Cerbo is a rev01 with the latest Firmware 2.54. I also have a BVM-712 (firmware 4.03)

The Cerbo GX is also resetting at the same time.

The Quattro flashes 3x “bulk”, “absorption” and “float” alternating with “inverter on”. It then has a solid “float” led while flashing alternating 2x “absorption” and “inverter on”. It then repeats that full sequence multiple times until the Quattro restarts with “mains on” and “float” steady.

There are no assistants, no ESS, no BMS and the Virtual Switch is off.


Jnkelliott asked
Jnkelliott commented ·

2 Answers

VE.Bus Mains Detector Installation For Multiplus 800


We have a Victron Multiplus 12 800 35. And the BMS came with a little dongle called the VE.Bus Mains Detector. I understand what this device is means to do. But the manual is only for the larger Multiplus models. I'm assuming that I attach the UTC cables together, that's easy. But the positive and negative cables (1 set-the other we will cut) will just go into the AC in 'plug' along with the AC in wires? (so that they are clamped with a screw together--see image)

Did I get this right?

Stephenb asked
Stephenb commented ·

0 Answers

Pinout RJ-45 on MultiPlus C 24/1600/40-16


I am looking for the pinout of the RJ45 port in the MultiPlus C 24/1600/40-16. According to this VE.Bus is/has a RS485 'connection' i'd like to tap into.

My idea is to have a nice raspberry-pi based solution to monitor the state of the system.

Thanks in advance!

( )

mattie112 asked
Kevin Windrem commented ·

2 Answers

Ve.Bus RJ45 cabling order

Is there a proper order for cabling the following Ve.Bus devices?
(Usually with a 'bus' order doesn't matter.)

DMC GX (required for current limiter when using a Ve.Bus BMS)
Ve.Bus BMS (required for Victron SmartLithium batteries)
Ve.Bus Mains Detector (to allow for DC start when AC is present)
Inverter/charger 1 (split phase)
Inverter/charger 2 (split phase)

In a full Ve.Bus chain of devices, the Ve.Bus BMS manual suggests that there is a preferred order (page 4):


This leads me to believe that there is a required Ve.Bus order of devices which with this equipment list would be:
DMC GX -> Ve.Bus BMS -> Mains Detector -> Quattro1(leader) -> Quattro2(follower) -> CCGX

Can Victron confirm this order requirement?

I guess this leads to a bunch of other related questions such as:

Do the specific ports on the Ve.Bus BMS have to be used as labelled?
Remote to DMC GX, and Ve.Bus to the Mains Detector, before the Inverter(s)?

Is there some unspoken addressing conflict if these are wired out-of-order?
Is it that the DMC is on the same address as the CCGX, where we are hiding the DMC behind the Remote port on the Ve.Bus BMS is required?

The DMC manual seems to suggest that you can connect it directly to an inverter which indicates its a Ve.Bus Device, but the Ve.Bus instructions indicate otherwise.


Natebert asked
Natebert commented ·

1 Answer

MultiPlus 12/3000 and VE.Bus BMS/Smart Lithium jumping between bulk and absorption charging

I installed a new system, mainly consisting of a MultiPlus 12/3000/120, VE.Bus BMS and 4 Smart Lithium 12.8/100 for a total of 400Ah.
Multi firmware is 2600430. Charger set for Lithium and Lithium Assistant is set up and started.

After letting it run for 24h discharging with small loads, today I connected shore power to see how the system is performing with AC In connected.

Charger went into Bulk, charging with 50A until after some time 14.2V was reached. Then it switched into Absorption as expected. Charging amps slowly decreased, which I think is ok. But then also the voltage started to drop until about 13.84V. Charger then switched into Bulk again, charging current starts to increase until 14.2V is reached. Then the whole process starts all over again, This all happens within minutes. See images attached.

I would expect the charger to stay in Absorption for 1h as it is set for with VE.configure.
So I feel there is something not working as expected.

Any help much appreciated.


edit: additional info - the moment absorption is reached, the BMS red LED comes on, which means either high voltage disconnect or temperature. Battery voltage is around 14.2V when this happens. None of the individual cells are anywhere near 4V nor is the temperature exceptionally high.




Stefanie asked
Stefanie answered ·

2 Answers

Cant not Connect VE Bus to my Phoenix multiples 24V 2000VA 60A.

I can't not seem to get my multiples to work with the MK3, it won't let me access it to change the settings on it.

the code on the board is 1818, can someone please help thanks.

Chinaka asked
Chinaka commented ·

1 Answer

BMV-602, Multiplus, and SmartSolar MPPT VE.Can - talk to each other?

I have the following products, and with all the various types of Victron communication ports, I can't figure out if any of them are capable of being connected to each other. Would anyone be able to answer if they can talk to one another?

  • BMV-602
  • Multiplus 12/3000
  • 3x brand new SmartSolar VE.Can MPPT Controllers

I think the BMV has no direct ports, the Multiplus has VE.Bus, and the SmartSolars have VE.Direct and VE.Can. Which I guess means none of them can be connected to one another??

The other question is whether a CerboGX would be able to connect to all 3 devices, thus successfully getting them all to worth together? The BMV-602 doesn't seem to have any ports listed in the manual, though, so I'm very confused about that.

Thanks in advance!!

Patrick Barranis asked
Guy Stewart (Victron Community Manager) answered ·

2 Answers

Is DMC GX still required for systems with Ve.Bus BMS for changing input current limiter?

Is the DMC GX still required for systems with a Ve.Bus BMS for changing the input current limiter?

The CCGX manual suggests that the DMC GX is still required if you have a Ve.Bus BMS:


Are the current limit settings, which are now present in the CCGX, sufficient for for controlling input currents in systems with Ve.Bus BMS batteries without the need of a DMC GX?


Thank you,

Natebert asked

0 Answers

Can I use the command "Input Power 1" for apparent power AND active power?

Hello Victron users and experts,

I hope you have some experiences in using Modbus-TCP commands. Perhaps my question is very simple to you. I found command "Input power 1" in the Modbus-TCP Register list and have to know something about the dbus-unit "VA or Watts". Do you know if I can request both types of power (apparent / active) ?

Thank you for your answer, because I'm not sure.

Manuel M. asked

0 Answers

Installing a Mains Detector on a 240 VAC Quattro without a neutral

My installation involves a 240 volt AC and 24 VDC quatro with an L1 and L2 design. Will the 120/230 vac Mains detect (supplied with the VE BMS), work when there is no Neutral or grounded connection on the Inverter in bus bars? How should it be wired?

Adventurousboat asked

0 Answers

MultiPlus 230V 12/3000/120 VE.Bus

Just a question about getting this unit up and running in the most basic form. I have this unit and would like to plug the battery in and get it inverting with no configuration (I.E. Plug and Play) or will I need to have some type of VE.Bus device connected?

When I try to power this unit up I get VE.Bus error 4. I've got a Venus but wanted to get this unit just up and running real quickly without moving my setup around just yet.

Cheers in advance

Icey asked
Matthias Lange - DE answered ·

1 Answer

MultiGrid 3000 - VE.Bus Error 11 (step 6)


I have an ESS 3-phase installation with 6 MultiGrid 48/3000/35-50 (two on each phase).

The system runs fine except this famous relay test.

I tried almost everything to troubleshoot this error, but before I try to contact my vendor(s) for the Multis, maybe someone here has an idea.

First of all, the error happens with or without load at the Multis. Without load means that there is nothing connected to the ACout of the Multis.

If I disconnect the Grid from the Multis (ACin), the Multis disconnect Active(in) and Neutral(in).

Measuring now the impedance between Neutral(in) and Neutral(out) shows > 5M Ohm, which looks correct for me.

Measuring Neutral(in) against PE(GND) shows 0 Ohm, Neutral(out) against PE shows > 10M Ohm.

If I disconnect the PE (GND) from the Multis the relay test passes without error and everything runs smooth.

I got my first 3 Multis about a year ago, the others are from October last year (1) and from two weeks ago (2).

For the error details see the attached pictures.

It would be very helpful to know what is tested during 'step 6'.

Any help is very appreciated.



schwarzenbergf asked
Vicky edited ·

6 Answers

ORION TR 48/24 380W switched by ve.bus bms

We have a setup where we want to charge a 24V lithium battery bank from a 48V source by using ORION DC/DC 48/24. The 24V lithium bank is managed by a Victron VE.bus BMS. Can we connect the charge disconnect on the BMS directly to the "H" connection (remote) on the Orion to switch it on and off ? Or is there a better way ?

Chris45 asked
Lysdexia answered ·

1 Answer

Two inverters, same device instance

Hello! I have been using a Phoenix Inverter connected to Color Control GX. It has device instance 257. I got a new Multiplus, and it also have device instance 257. How do I go about solving this?

Drogos asked
Drogos commented ·

0 Answers

Venus GX -> NMEA2000 / Signal K

I have an EasySolar 24/1600 that I'm looking to tie into my vessels sensor / monitoring network.

From reading this article it looks like the recommended approach has been to bridge both the VE.Bus connection from the internal MultiPlus and VE.Direct from the MPPT direct to N2K. In the comments section though there was talk of a CCGX -> NMEA integration. Is this still something on the horizon?

I'm assuming it will apply to the Venus GX too? If so, that would be a much neater integration (VE.Bus and VE.Direct -> Venus GX -> NMEA) as well as providing a couple of additional sensor inputs.

On a slightly related note, has there been any consideration for providing a direct Signal K interface from the Venus / CCGX?

kim asked
mvader (Victron Energy) answered ·

6 Answers

VE.Can and VE.Bus???

I'm looking to expand the Victron equipment on my boat and keep seeing references to CAN and BUS....can anyone explain the difference between them?

I've seen CANBus talked about and as far as I understand the CAN is the "brains" and the Bus is the way that the data is shared. What is confusing me is the way that Victron has then separated and there are VE.Can to VE.Bus connections.

Bora asked
Paul B answered ·

1 Answer

VE Bus Error 17

@mvader (Victron Energy)


We have been experiencing VE Bus Error 17, we have followed Victron's suggested advice such as updating all devices to the latest firmware, replacing all of the VE Bus cables including the one to the Venus GX, reloading all of the ESS assistants into each of the inverters etc. The system has not shut down with error 17 for around 4 days however this is not unusual and we are not confident that it is resolved until the problem has been pinpointed.

Please see the VE.Bus diagnostics below. We have 6 Multiplus II's in the system yet only 5 of them appear here. The VE Bus daisy chain runs through Phase L2, device 2 (4) (the missing one) to get to Phase L3, device 2 (5) proving the cables are ok all the way through to the last inverter. I have also exchanged this inverter (L2 device 2 (4)) with another one to see if the new inverter showed a counter, with no such luck.


1. What could be the reason that all 6 inverters in the system are not appearing in this list?

2. As Error 17 is related to the slaves in a system and will report this error when the communication with the phase-master has timed out, could this missing slave be related to the error 17 shut downs we are experiencing?

We have been battling this error on our own for around a month and would now appreciate some advice and some help to overcome the problem to reassure our customer that the system can operate as intended.


Wes Corbet


Wesley Corbet asked

0 Answers


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