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Cerbo GX - Temperature activation of relay.

Greetings All , Question is . When using a Venus GX or Curbo GX . I need to activate one of the relays based off one of the Temp Sensors plugged in to the Venus or Curbo . I can get an alarm via the VRM as well as an email notification and that works fine but I need the relay on the Curbo to be activated . This is to enable a backup system for the refrigerator . Any advice would be great if this can be setup .

Stephen Phillips asked
wrinkledpants commented ·

6 Answers

Multiplus II – Ground relay test failed #8 - Error 11 0x24

Hello everyone,

This device worked perfectly over the past two weeks and today it started dropping the AC loads.

This notification is displayed – “MultiPlus-II 48/5000/70-50 - #8 Ground relay test failed”

The VE.Bus Error report shows – “Last VE.Bus Error 11 report 0x24/Error occurred/GND Relay Error”

When I restart the Multi it produces the error right away. The bulk and absorption LEDs are also on.

Current firmware version is v471 (Multiplus II software version: 2623471)

I have done the following:

-Verified that AC-in GND is properly connected to grid earth.

-Tested for voltage between AC-in GND and AC-in Neutral. Ok - no voltage measured

-Verified that earth and neutral is not connected somewhere. All ok.

-Physically disconnected all cables from AC- out1 and AC-out2 to verify that there is no problems with any of the loads.

-Switched loads directly to grid via change over switches - all loads functions properly.

-Tested RCDs all ok.

Thank you,


jeanmc asked
kyle answered ·

5 Answers

Control mains power supply to Multiplus

Is it possible to use the generator control relay on my Color Control GX to switch a 12 volt controlled relay that has a 240volt switched outlet to control the supply of Mains power to my multiplus in the same way it would control switching a generator on/off?

mpdaff asked
mpdaff commented ·

3 Answers

Orion-Tr Smart DC-DC Input Relay allowed?

Hi, My sprinter has the factory Additional battery cutoff relay installed under the drivers seat. Is it ok to allow the cutoff relay remain in place in between the alternator and the DCDC Charger?

john-t asked

0 Answers

Onan Auto Gen Start with CCGX

So i have read what i can find on Victron's website about setting up the Auto gen start via the CCGX relays. I have an Onan that operates via a mom/off/mom(Start/off/Stop) switch. I saw the $80-$100 time delay relays that they reference and i understand their design but is there a better option for way to make the generator start and stop through the CCGX?

johnathanhall asked
bf-mining commented ·

5 Answers

Offgrid site - Controlling cooling FAN based on temperature


I'm about to install a site that is purely DC - no inverter. We will have these victron devices:

MPPT - 250/60

Venus GX

Smartshunt + temperature sensor

The relay output of the MPPT is already used to control LVD, protecting the batteries from deep discharge.

I'm looking for a way to control a FAN based on the cabinet temperature. It will be very hot in summer, and we do have temperature measurements via smartshunt. However, I can't find an option to control the Venus relay based on this parameter. Is this possible or am I missing something?

Elimac asked
shaneyake answered ·

1 Answer

Multiplus programmable relay

Hi I would like to use the programmable relay to signal my camper unit that the shore power plug is connected. Which relay mode would be best to send a 12v signal to the unit when shore power is connected and available? Best Kirsten

kstyler asked
kstyler answered ·

3 Answers

Remote generator start with 4 wires

I'm currently installing a Multiplus II/Smartsolar system in an off-grid setup and intend to use my generator as a backup using the relay function on the Colour Control. However my generator (a Lister Petter Alpha series) has a 4 wire remote start (grey, black, blue, brown). Does anyone know whether it is possible to re-wire/bodge this so it will be compatible with the 2 wire remote start relay from CC? Unfortunately there is no information that I can find from Victron or Lister as to whether this is possible

Many thanks

dsparshott asked
Rob Duthie commented ·

2 Answers

Disconnect BMVs SoC depended relay function and discharge floor

Guys, there have been several request now cause there are numerous applications, where a user wants to switch devices based on the SoC, WITHOUT changing the discharge floor.

In my application, I want to use the BMV-700 relay to switch a large power relay to reverse IN/OUT of my Orion, to charge the starter battery as soon as the AUX battery SoC is above 95%. But in regards to the time-to-go, I want to leave the discharge floor at 25% (75% DoD).

I urge you to take these request into account when determining the scope of the next firmware update. Please !!

cstenger asked
cstenger edited ·

0 Answers

How can I use the 2nd Cerbo Relay?

One relay controls the generator start function based on SOC as reported by a SmartShunt. Turns ON the main generator at 60% SOC, and OFF at 90%. So far so good.

Is there a way to use the 2nd relay output with similar logic to control the field current to the main engine alternator so it turns ON at 80% and OFF at 95%?

Alternatively, I imagine I could use a BMV-712 and use its relay logic as the control for the second charging source as a function of SOC?

billknny asked
shaneyake commented ·

3 Answers

Multiplus 12/1600/70 relay clicks when AC shore power is connected not charging inverter works

Hello Phoenix Multiplus 12/1600/70 started to cut out on AC in 'charger only' setting connected to shore line. It started intermittently and I assumed it was voltage drop from shore post changed cables & input but no issues. The green light comes on for inverter and 230V sockets work from that but as soon as 16A shore plug is connected fan comes on then orange charging light briefly then relay clicks and shuts down the red thermo fuse no doesn't pop out???

I have 4x sealed Hankook 12v leisure DC batteries along with 600w solar to a 50A MPPT charge controller which was doing fine for 4+ years only recently with addition of 2x 500w smart radiators being installed if they were on at same time as fan oven the Multiplus fuse would pop out then reset when pushed back in. A guest on boat confessed to using an electric kettle which may of pushed past 1600w limit of the Victron could this of broken charger? The inverter still works I have tried pushing up the AC plug connectors to ensure a good connection anything else I can try internal fuse replacement?

Thanks in advance


peter-holm asked

0 Answers

Phoenix combi ground relay

I have an old 2001 Phoenix combi and i want to turn the ground relay off to suit UK equiptment.

I have a mk3 to usb and i have tried plugging that into the combi unit to access through ve configure but it dosent seem to want to connect. I presume the unit is too old. Is there another way to do this?



innovativeecohomes asked
Matthias Lange - DE answered ·

1 Answer

Control CerboGX relays via CZone with VE.Can to NMEA2000 ?


I want to connect my Cerbo GX to the NMEA2000 network using the VE.CAN->NMEA2000 cable (ASS030520200). Would it then be possible to control the relays of the CerboGX via the NMEA2000 network (i.e. via CZone) ?

Would it also be possible to read out the binary-inputs of the Cerbo GX via the NMEA2000 network?


Roel Broersma asked

0 Answers

Quattro 5k 50-30 230V

My inverter is on charger only mode currently, with grid power connected to ac-in 1 and pass through to ac out, but the inverter will still randomly disconnect the grid power from my house. What is the possible cause for this problem, since it happens even when almost no load is being pass through those relays?

venterjl asked
Paul B answered ·

1 Answer

"Ground Relay" setting, on or off?

Hello, I have a Multiplus 2000/12/80. The Ground Relay setting is on by default. Based on my reading it looks like I should turn it off. I don't have a ground relay wire hooked up and I didn't buy an autotransformer. All I have hooked up to my multiplus is the battery, chassis ground, shore power, AC, and battery temperature cable. Am I missing anything or should this be turned off? Would having it turned on have caused any issues?

Thanks for the help!

kaplan78 asked
johnny answered ·

8 Answers

Multiplus II external ground relay setting

So installing a few Multiplus II's in US/ split phase with an autotransformer. The manual lacks clarity here. On the Quattro you leave the "ground relay" box checked in VEconfig, flip the dip switch near the small terminals to "reroute" the signal to the external relay terminals. On the MPII there is no dip switch to "reroute" the control signals to the external terminals. Does the inverter sense an external relay and reroute on its own? Does disabling the ground relay in VEconfig enable the external terminals?

Whats the proper procedure on a MPII?

pganguet asked
pganguet commented ·

1 Answer

Using BMV-702 relay for low voltage disconnect

Hi Folks,

I am trying to get some form of low voltage disconnect working utilising the BMV-702 relay (or CCGX for that matter....)

Importantly however i want to put a "delay" in place so that if i switch the kettle on and the voltage dips, it doesnt suddenly shut off power.

I have the relay set up as "inverted", so that it is normally closed.

I have the "minimum closed time" set to 1 minute; and

I have the Relay-Off delay set to one minute.

However as soon as the voltage dips below the trigger point, the rely instantly goes to Open.

Unfortunately i suspect that min closed time, is exactly that.....once the relay closes again it will take (in my case) 1 minute to go open again; I think the logic doesn't quite work when inverted.

At the moment i am using the relay on my multiplus, including programming the delay with the assistant. the trouble is that if i toggle the power on my multiplus, it then triggers the relay and trips the low voltage disconnect as well. Hence i am trying to use the BMV relay.

thanks in advance for everyone's thoughts!

drewgarth asked
drewgarth answered ·

1 Answer

Off grid system. Switching in extra load when SOC 100%

We are designing and off grid system with a solar array though a couple of Smart MTTPs. There is almost certainly a Cerbo GX in the system. During the day when the SOC reaches 100% we would like to be able to send any further solar energy to a simple DC heater. This would need to switch out when the MTTP were no longer exceeding the normal system load.

We hoped to program the Cerbo relay to control a high power relay. Is this possible. Or is there another way. I noted the Cerbo info state "diverts excess (solar) power to self-consumption" but fail to find an explanation.

Many thanks for all contributions


askii asked
tozz answered ·

1 Answer

Using Cerbo gx to read low fuel

I have a diesel generator which starts when the battery voltage is below a certain level which is triggered by Cerbo gx relay1. I would like to know if I can send any signal for low fuel reading examples under 5% or 20L to be sure the generator doesn't start if the fuel is too low.

lyko2021 asked

0 Answers

ACout 2 programming for Deferrable Load (water heater) control.

We are trying to get the ACout 2 relay work as a deferrable Load controller, the issue we are facing is that we need the following condition to happen in AND not OR logic to activate our water-heater so we can make sure that we are

1- Not affecting the batteries absorption cycle by sucking current from it during Absorbution, which will be the case if we use ONLY a voltage set point.

2- Create a very narrow operation window for the deveriable load to work in

Is there any possibility to make a programmable relay logic conditions in AND not OR?


Mohamed Mamdouh Elkadragy asked
jorisvn commented ·

3 Answers

ACOut2 Relay Status on VRM Portal (Workaround) - Updated

Edit: I changed the Digital Input Type from Door Sensor to Burglar Alarm. Some inputs send updates to VRM Portal on every poll and some send it on an event. With the Burglar Alarm type I can see the exact times my inverter switches ACOut2. Everything else in this guideline stays exactly the same. Note, the images have not been updated and still show the Door Sensor input type - used for reference only.

While I am also waiting on Victron to find time to add the ACOut2 Relay Status to VRM portal and the Modbus Registers I thought I'd use a workaround to get what I need.

The following is a workaround to get a Quattro ACOut2 Relay status on VRM portal and also to check it via Modbus/TCP. Below is what it will look like.


What you need:

1. GX device with Digital Inputs. Refer to the following link to compare different models.

2. Two to Six core Mains rated data cable depending on how many inputs you want to use, that you can legally use inside a distribution cabinet. I used some spare CBus Pink data cable that has an isolation voltage of 4KV. It has 4 cores but only used two for Digital Input 1 and Ground.

3. A suitable connector, to plug into your GX device's Digital Input port. I'm using a Venus GX and it requires a RJ12 connector. Refer to your GX device manual to see what is required.

4. A Mains rated DIN relay like a Hager EN146 Humfree relay.

Venus GX Setup

1. In your GX setup, go to Menu -> Settings -> I/O -> Digital Inputs and Enable Digital Input 1 and select Burglar Alarm.

2. Go back to the the Main Menu and you should see the Digital Input now visible on the GX screen. Go into the Digital Input 1 menu and select Setup. Make sure you Disable the Alarm notification and select Invert otherwise the state will show Alarm when in fact it's disconnected or unplugged.

3. Go one step back in the Menu and select Device. In this menu you can rename the input to EG. 'ACOut2 Relay'.

VRM Setup

At this point the new Digital Input should be visible on VRM Portal under Devices.


To setup VRM Portal to show the status you need to go to Advanced and then select the Widgets icon in the top right hand corner. Scroll down to the new Digital Input and select the two options as per below.


You now have VRM Portal reporting on the Digital Input 1 you enabled.

Wiring Setup

1. To wire everything together you need to install the Relay coil between ACOut2 and Neutral after your ACOut2 breaker. The relay will engage when ACOut2 is active and disconnect when you are in EG. Inverting Mode or any other mode that disconnects your main ACOut2 Relay.

2. Wire the NO/COM contacts of the new relay back to the GX device's Digital Input 1 using the mains rated data cable and you are ready to roll.

Final thoughts

I know this method is a workaround but at least you can monitor the state of the relay via VRM Portal as well as Modbus/TCP. In my particular case I wanted to know when it engages or not as I suspect a controller failure on my Quattro is not handling ACOut2 Relay as it should (fix in progress...)

To check the status of the relay using Modbus/TCP just connect to the GX IP address and use the Digital Input 1 ID and Register to read the Holding Register value. It should be either 6 or 7 as per the documentation.


I am not an electrician and any work done from the above suggestion is at your own risk and I am not responsible for any damage it might cause. If you feel you need verification or assistance with the above then please contact your Victron installer/reseller/distributor or electrician.

Ingo asked
Ingo commented ·

2 Answers

RELAY controlled easily over VRM

It would be useful to be able to change the state of a relay via VRM for example that could control a load remotely. IE - turn an airconditioner if it had been left on accidentially . At the moment a customer is using the relay in the MPPT to do this function but this is not ideal.

David asked
Alexandra answered ·

1 Answer

Cerbo GX Gas Alarm Question

New to this so please bear with me.

Does anyone have any thoughts on configuring a gas alarm with solenoid shut off valve via the digital inputs and relay port on the Cerbo GX? I'm looking at a gas alarm setup (BEP Gas Detector) with two sensors and solenoid but its working out very expensive, £300+. Wondering if there may be a better way to use a simple gas detector and solenoid (gas rated) for this with the Cerbo GX?

daveybdublin asked
daveybdublin commented ·

1 Answer

AC connect 3kW wind turbine Victron Quattro System

I have a Off-Grid Quattro 10kVA with AC Connected 3kW Fronius Primo solar inverter and 4kW of solar panels. Frequency shift is used to manage battery overcharge. System works great in summer but we are expanding for winter with additional solar, and a wind turbine. We will AC connect an additional 4kW Fronius and solar array. For wind, we are installing a 3kW 60V AC turbine that will rectify to 48V DC and this feeds to a grid tie wind controller/ inverter (China Supply) that will synch to the AC Bus. The controller will dump power to dump resistors to protect the turbine from over speed/ voltage/ frequency.

However, i am concerned the Wind controller inverter will not spill turbine power (trigger dump resistors) when the AC Bus frequency is shifted by the Victron Quattro (High batrery voltage). Logic tells my the inverter would disconnect on high AC Bus frequency and send all power to dump resistors, though I cant be sure and manufacturer info is sketchy.

My question is whether it would be possible as a back-up to use one of the quattros Programmable relays to trigger when the AC Bus frequency is shifted to say 53hz. In this way I could trigger dump resistors to spill wind turbine power when it is not needed for House Load or battery charging.

gallows asked
mvader (Victron Energy) answered ·

1 Answer

What does ESS Relais Test Relay Test??

Hi all,

My MultiPlus 2 GX is not discharging the batteries. According to the documentation, the ESS Relay Test is not completed. I have checked it in the settings, and indeed it is not done.

Can someone explain me please, what this Test does and how to start it?

If i choos "Ausgleich" the first option on the screenshot, it starts to charge the battery. Not regarding the state of charge not the max. allowes charge voltage. It's set to 56V and I charges even > 58V.

I'am worried, because my battery is 100% charged and discharge is not working at all. Any good idea how I can get this stupid test done?

Kind regards



schnema asked
schnema answered ·

2 Answers

Relay on cerbo gx configured as alarm not working

Hi all, Im using a smart MPPT 150/70 connected to cerbo gx via ve port to monitor battery voltage via the VRM alarm rule. When voltage drops we get alarm email but the relay output on cerbo gx that is configured to alarm doesn't change status .

Also when i try config low battery as additional alarm rule in VRM via selected MPPT device comes up as per below:

Low batt. voltage alarm: No value available, product not connected?

Any help would be great cheers

rms-industrial asked

0 Answers

15kVA AC1 input clicking on off non stop and AC2 out misbehaving

Hi Victron gurus. I have a weird problem:

I had installed a 15kVA using AC2 as the mains input and AC1 for generator (don't ask me what possessed me to do that) It worked fine although I wanted to use GX gen start/stop relay and prevent switching off of relay if mains was present (AC1 - I realized I couldn't change it to AC2)

So I rewired - gen to AC2 and mains to AC1, as it should be.

Immediately on turning on, after the brief monitor period of incoming mains a relay could be heard clicking on, a brief, normal hum of inverter, then click off, and repeat, non stop.

After some time having turned off mains, I tried it again and it clicked a bit but then came alive and ran fine for a few days.

Next I knew, my AC2 out relay was behaving badly. AC2 out powers a line that has 3 relays on it. The "1st" relay is on GX gen start stop, running 2x cold rooms. Was working like clockwork, next I hear the cold rooms were coming on and then going off after a short time.

Conditions: Relay off >12000Watts for 10sec, relay on <10000Watts for 30 sec. Load of 2x cold rooms is 2500Watts together. Off if SOC <90%, on if SOC >95%, don't "run gen" if AC1 is present. Battery was 98% SOC...

Tong test revealed 30 to 40Amps drawing on AC2 (6 other drinks fridges on same line). I am still suspicious that this is higher than normal - yet to double check.

Back to problem 1: I remotely sent updated settings, as I checked my parameters for AC2. The moment the inverter rebooted, my chap on site reported the return of the dreaded AC1 input clicking....

When mains is turned off the clicking stops.

System installed in a 3 phase building using one phase. Voltage sitting at 202Volts. No voltage fluctuation to speak of during the clicking event.

I tried changing to a different phase - same problem and same low 202Volts.

0.62V between neutral and ground on mains side.

Inverter output 2 pole isolators switched off - no difference (both AC1 and AC2 outs)

Am yet to try putting mains back to AC2 input, but this will be a fruitless exercise as it needs to work on AC1.

Any clues??? Is the inverter bust? If so howww?

cheers, Tal

I tried to attach audio but was told I can't attach such a file type................ Victron Community??

Talfan Stamps asked
Daniël Boekel (Victron Energy Staff) commented ·

4 Answers

MPPT relay trigered by charging


In my aplication i need detection of charging by MPPT. I was going to use the build in relay, but there is no such option. The perfect solution would be to trigger it when charging power is for example 50W or higher. As i saw in configuration its not posible to detect charging, so for sure its not posible to detect specific power of charging. Now im using Day detection option, but its also not working - if there is some not natural source of light its always trigered.

Summarizing i need to detect day of charging from MPPT, prefered without any other devices.

szymlis asked
lehrling answered ·

4 Answers

BMV-712 running contactor - what am i doing wrong?

I've reviewed all the related posts here I can find but I still cannot figure out what I am doing wrong.
I want the BMV to operate a 12V relay as a low voltage cutoff. I want the relay to be normally open and only close and allow power to pass when the voltage is above cutoff value.
The contactor pulls just shy of 1A when it's closed.
I have a 48 to 12v dc-to-dc converter that i am using to power the contactor. I took the 12V positive with in-line 2A fuse and ran it to the "C" port of the BMV. I ran a wire out of the "NO" port to the plus side of the contactor. Ran a wire from the negative side of the contactor back to the negative bus.
I have also tried using the "NC" port instead.
I can get no response from the BMV. I have it set for Default mode and have toggled between the two "Invert" modes. I can hear something happen in the BMV but the contactor never actuates.
Anybody have an idea what I am doing wrong?

deek asked
deek commented ·

2 Answers

Multiplus programmable relay assistant multiple conditions AND / OR trigger

Hi! I tried to find this info in the documentation but couldn't.

If I have a relay assistant with multiple rules, does that trigger when any or all the conditions are met in the settings?



eliott asked
eliott answered ·

1 Answer


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