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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
morganb commented ·

7 Answers

Does a GX device (External Control) with a SmartSolar override the Float/Storage state for the relay trigger?

Our customers like to use the SmartSolar relay to trigger an external contactor with an immersion element when the (CANbus Pylontech) batteries are fully charged. Triggering the relay on Float/Storage state seems to be the best approach, though we've discovered the relay does not seem to trigger when the batteries are full when the SmartSolar is operating under "External Control" from the Cerbo GX with DVCC enabled. If DVCC is disabled, then this seems to work as desired. On the Victron Connect main page for the SmartSolar, it'll only display Bulk/Absorption/Float state when DVCC is disabled; otherwise it only says "External Control".

I was wondering if others have experienced this, or if Victron staff can confirm this is the correct operation and whether there is no way to use the Float trigger relay option when using DVCC and CANbus batteries. Thanks

midsummerenergy asked

0 Answers

Unable to turn MPPT relay on - Battery voltage low

Today I was setting up a new Smartsolar 150/60 and I'm going to use the relay to control a Low Voltage Disconnect circuit. I've setup MPPT relay accordingly and tried to test it by setting the low voltage threshold higher than the Vbatt the MPPT was seeing, but I still could't make the relay change state. Some details:

- MPPT is new, this test was on bench, powered by a DC 48V supply

- No PV attached

- Tried the same configuration on a live system with 150/70 MPPT (with real Battery and PV) and I could make the relay change, as expected.

What am I forgetting with this new MPPT? Both MPPTs had same firmware, 1.59

Elimac asked
sourcecraft answered ·

1 Answer

Quattro relay programming alarm 2 AC inputs


i have two AC inputs on my Quattro 5000. Does someone know, whether it is possible to programm a seperate alarm with the relay. That I can see wich AC input is shutdown. (Input 1 or Input 2 or both)

fynn asked
fynn commented ·

1 Answer

BM-712 Smart What is the relay used for? Is it just an alarm or does it shut off power to the battery bank?

I've had the alarm go off according to the parameters that I set in the Relay module but I don't think anything else happened other than the alarm. The coach was still receiving power and the batteries seemed to continue getting charged. The alarm was for over current to the batteries during charging.

joaquinjanet asked
sbman answered ·

2 Answers

Remote control - Relays, inverter powers, etc... - missing features or missing information?

I've been looking for any way to remotely control the relays on the Victron products I am using. I have a BMV-712, and a Cerbo GX that both have relays. I'd also like to control the on/off state of the phoenix inverter.

The only way I can find to remotely control the relay on the BMV-712 is to use the Victron Connect app, connect to the Cerbo GX, then go into the BMV-712, then go to the settings, then go to relay, make sure it is set to manual and then 'invert relay'. This turns the relay contacts on or off.

I've tried setting the relay mode to 'Remote' and rebooted the Cerbo hoping it would recognize the relay. It doesn't.

Then to control Cerbo GX relays, I can't find any way to do that remotely at all, except a sub-sub menu in the console. And VRM console simply refuses to work in my installation (I've been through all the suggestions, none of it helps). So no remote control at all.

To turn the Phoenix inverter on/off is the same situation as the relay control on the BMV-712, only through Victron Connect under several menus/settings screens.

Am I missing something? These seem like obvious features and glaring omissions. Even using the local GX interface, I cannot find a way to do these things, there should be a standard screen on the Touch 50/70 to turn relays on/off and inverters on/off.

sbman asked
sbman answered ·

2 Answers

Multiplus Relay Programming

Trying to do some load shedding with the Multiplus Relays, actually the whole reason I purchased the Lynx Dist, MP, Lynx Shunt, and Smart Solar MPPT x2 is because i thought that this system would help me in my system.... however it has not.

how do I load shed to a hw/tank, allow air conditioning to run, or even less basic functions without a truly programmable relay..

I am a PLC programmer and millwright-electrician by trade, but cannot for the life of me figure out how to make the most basic required functions of an off grid application work with the so very basic means presented.

Is there a way to "write" your own assistants, or your own logic...?

When I see the words "programmable" I would assume I can program it!!!

clayton-peppard asked
JohnC answered ·

1 Answer

230V Relais for digital output

Hi there,

I have a cerbo in my RV and want to control a 230V awning socket / outside plug via the digital output Relais.

can you recommend a corresponding 230V Relais for that?

Thank you!

bitcrusher asked
Paul B answered ·

1 Answer

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
evofxdwg answered ·

3 Answers

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 commented ·

3 Answers

Free relay pulse


I am trying to trigger a remote pulse relay via the aux relay in a color control unit. Does anyone know if the aux or free relay can send a pulse instead of a signal when certain conditions are met?

jolyon asked
lars-1 answered ·

1 Answer

Victron Cerbo Gx relay state NC

I have a cerbo GX having the "relay 2" in normally closed state. This is kept in a "normally closed" state to turn on a small fan whenever i turn on the cerbo. But the issue I'm facing is that, the cerbo switches on the relay for 2-3 minutes and switches it off. Then i use the remote console to turn the relay on again and it stays on. Does anyone know why the cerbo relay switches automatically for 2-3 minutes of operation? Does anything happen to the relay when cerbo is connected to the network?

joel-cherian asked

0 Answers

How to integrate new features on Cerbo GX


I need to integrate a new feature on Cerbo GX device (adding a new function to a relay). The coding part looks not that complicated, I already have an idea about how to add the feature.

But my question is: how should I proceed ?

1) Should I add my feature on my Cerbo GX device, test and "clone" the image to be able to later, upload the image on other devices.

2) Should I build the OS image from source with my feature in it ?

Thank you for your help.

stabilo asked

0 Answers

Cerbo GX control intellitec 12v pump control.

I want to be able to switch on/off manually a 12v water pump controller. Intellitec 0000145100 10 Amp Monoplex Water Pump Control Are rhere any reference wiring diagram I can use to use relay 1 or 2 to function as a switch for the pump controller?

manjo asked
Alexandra edited ·

1 Answer

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?

Mike Daff asked
Mike Daff 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

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


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