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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

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
jmarc commented ·

2 Answers

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
peter-rexer commented ·

4 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 edited ·

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

Using the BMV-700 relay

I have the BMV-700 installed in a solar powered camper van with AGM batteries. My understanding is that I can set the BMV relay to disconnect power so that I do not overdraw the batteries. I have set the floor parameters in the settings and done some tests. I set the SOC% floor and also the battery voltage floor and ran a bunch of power through to draw the batteries down. The BMV shows that the battery percentage and voltage are both lower than the floor that I set but it did not alert or use the relay to shut power down. I drew it all the way down to 11.4V and it read that as 35% remaining. That was as much as I felt comfortable draining them.

What am I doing wrong? Or am I misunderstanding the capabilities of this unit?


tjorg asked
ishtiaq commented ·

1 Answer

Multiplus II gx - no VRM controllable relay?

There’s no controllable relay on multiplus II Gx’s I can see the point of an all in one neat unit but the controllable relay is an important feature in so many installs? As it goes I’ve bought one for an install not realising till it was too late I thought it would have standard gx functionality and a controllable relay on board. Is there a way I can still operate a generator between certain percentages that are transmitted from canbus bms batteries I was thinking virtual switch maybe? Not ideal though.

jacko asked

0 Answers

Setting the output relays CerboGX by temperature

Hello, is it possible to configure the output relays K1 and K2 so that they work at a given temperature? I get the temperature from a temperature sensor connected to CerboGX.
And one more question, how to display this temperature on the monitor?

anton859 asked
Eddy answered ·

1 Answer

How can I clear the Multiplus II VE Bus Error 8 / 11 report?

I'am Installing a Multiplus II 48 5000 with solar MPPT Charger.

And now I'm wondering about the new Error 8 / 11 Report page, because there ist an Error listet an I don't know how to delete this error.

The system is running fine and I want to get rid of this error. What also confuses me is that the error main page shows no VE Bus errors at all. And this is where I need more information: Does last VE Bus error report mean the last error 8 or 11 is stored in this list and just stays there for ever?

to exclude any futher wiring mistakes I disconected all AC-Out wires inside the Multiplus.

Only AC-In is connectet and I checked the wires serval times.

As in many european Countries the N and PE on the AC-In are at Ground Potential, but this should not be a problem. I have a standart european TN-C-S Power Grid.

With this question I just want to make sure I'm not chasing any errors witch I solved long time ago.

Hope you can help me

Regards Felix



felix-vt asked
felix-vt commented ·

1 Answer

MPPT 150/100 High Temperature (Dimming) Relay Control

I'd like the fans in my battery box to turn on during high temperature's. The VictronConnect app as an option under the Relay selection called High Temperature (Dimming) - When looking this up in the manuals the only information shared is:

High temperature (Dimming). This option switches the relay ON when the charger output current is reduced due to high temperatures. Use this option to for example switch an external fan.

Does anyone have information? At what temperature does it consider high temperature? What does the "dimming" mean? To be honest I'm a little disappointed at the lack of documentation on this relay options.

hummingbear asked
sunnywell answered ·

2 Answers

How to use both Cerbo GX relays?

Hello everyone.

I need to use one relay for the Genset to switch ON when the battery bank (Pylontech) SOC goes down to 20% (lets say). and stop when the batteries get charged.

I also need a second relay for a device that needs to know the battery charge, ie that it will turn ON only when the batteries are full.It just needs the signal. How do I program this? In the comparisson table ( it says that the Cerbo has 2 x NO/NC.

Is this enough for what I need? (genset+the other device)

Thanks a lot

tpwchr asked
tpwchr edited ·

1 Answer

what relay will work with 48v BMV 712 for 30 A load

I assume the relay coil should be 48v, I want to control 12v 30A loads and can't find one. Any sources ?

toolik asked
lucode 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
marekp answered ·

6 Answers

Cerbo gx relay #2

Hi everyone I was wondering if someone could write an update for my cerbo gx that allows relay #2 to be activated when the grid fails and add an option for time delays for it. I do not have any victron inverters but I am using a et112 to measure the grid. Would the cerbo gx use the et112 to monitor grid?

lsps219 asked

0 Answers

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
Vance Mitchell answered ·

1 Answer

BMV-712 Relay to switch off DC to DC Charger and MPPT remote ON/OFF Pins
Hello, could anyone give me some information regarding the best way to set up Relay on the BMV-712 for use in my Campervan

I would like to use the BMV-712 relay to switch off my Victron DC to DC charger & my Victron 150 | 60 MPPT via there Remote ON/Off ( L & H ) pins in case of Low battery temperature ( or another trigger I wish to use ) . I have temperature sensor for the BMV and want to use the low temperature trigger to trigger the Relay.

Wiring wise what would you recommend? What output on the BMW and which pins in the Dc to DC & MPPT should I use?

Just so I'm getting this Correct the "L" pin Supplies a 3.3v Live, When the "H" pin Receives a voltage of 3v or higher it turns the device on, and less the 3V it turns the device off? If this is the case could I Ignore the "L" pin on the devices and Wire a 12V live from the Battery into the COM port of the Relay and then just Parallel the "H" pins from the NC relay port. when the Relay in the BMW is normally closed the charger & MPPT would be ON, when the low temperature triggers ( or any other trigger ) , it will open the relay which would turn off the Charger and MPPT ( and prevent my lithium battery is charging when cold and my Batteries internal BMS doesn't have low temperature charge cut off ) 

OR would I use DC/DC Charger & MPPT L pins in Parallel wired to the COM relay port on BMV, then NC relay port wire in Parallel to the H pins on the charger & MPPT.

Since I want to control both the DC/DC charger and the MPPT remote On/OFF at the same time from the BMV relay. Running the output ( NC ) In parallel to multiple things shouldn't be an issue should it?


alex-frood asked
wkirby answered ·

1 Answer

Relay 1 settings change of use of excess power


I am trying to improve on the settings for utilising the relay option to start up a pump when there is excess solar power. I am able to start a well pump by opening up a solenoid valve through the use of 'relay 1' on the VenusGX. This is great as I am able to start the pump only during certain times of the day and also when there is excess solar available. The settings that I am using at the moment are:

1. 'Relay 1' uses the 'Generator start/stop settings';

2. Use 'AC load' as a 'Condition' to open up a solenoid valve;

I currently have the solenoid close when the total consumption is higher than 50W for at least 600s (this avoids opening and closing the solenoid too often on partially cloudy days). I open up the solenoid when the total consumption is lower than 0W for an hour. As the total consumption is less than 0W I know that the batteries are fully charged. This means that I am certain that there is excess power being fed into the grid and therefore there is power that can be utilised elsewhere. Unfortunately I am not able to determine how much excess power I have and therefore the 1kW well pump might be starting when there is only 100W of excess power.

Victron staff, is it possible to have the values for setting 'Stop when power is lower than' under 'Generator start/stop settings' > 'Conditions' > 'AC load' > to a minus figure? That way you can start bigger pumps/heaters when the excess load is closer to the rated power requirements of the pumps/heaters. Effectively what you then are creating is a unit that has similar functionality as other units like the Fronius Ohmpilot.



casper asked

0 Answers

Can I use Venus relay to turn on and off a phoenix inverter?

I have solar installation with two inverters wired from the same battery bank. Can I use the venus relay to turn on and off one of the inverters on a schedule as with the generator function?

macevedo asked
ripper answered ·

1 Answer

Cerbo GX to control RV Relay Switches

Has anyone looked into using Touch GX with a Cerbo GX to control a RV's relays? The relay's currently support 3 way switching for different switches in the RV. For example the water pump can be turned on from outside or inside. I would look at controling water pump and two others that control lights outside. I would think this could be an option using the Relay ports on the CerboGX. Since the switches are connected to the relay device in the RV I would think the Cerbo GX could to momentary 1 second closed connection?

burnttech asked

0 Answers

Enabling solenoid valve with Venus GX and excess PV power


I have a Venus GX and would like to utilize relay 1 to enable a solenoid valve to turn on my well pump at times when I am generating too much energy with my PV array:

I have set the relay parameters to open when the AC consumption of my Multiplus II is less than 50W for 5 minutes continuously (i.e. when you know that it is a sunny day and my batteries are full).

I have been running these settings for a few days now and it changes the relay at the correct time. When I connect the solenoid to the relay however it does not energise the solenoid. I am already using a number of these solenoids elsewhere and I know that the continuous current to keep them energised is around 300mA at 24VAC. I assume that this relay should be able to cope with these types of solenoids?


casper asked
warwick answered ·

1 Answer

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
duffer41 commented ·

4 Answers

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
gallows edited ·

0 Answers

BMV 712 relay to turn off external load at preset SOC

I want to turn on a water heater when the SOC is between 85 and 100% and shut it off when it falls below the 85% value. i.e. I just want the relay to open when SOC is below 85%. Closed the rest of the time. I can make it work with 85-99% but that means when charge reaches 100 it goes open. The load is a small water heater and there is a lot of solar so even with the heater on it is not unusual to hit 100% Using a smart battery protect 65 as the relay. If can be done, what are the various setting on the BMV relay screen. The documentation is not very clear as to the behavior in various modes. Thanks

rse asked
Jaco Reinecke answered ·

1 Answer

Relay functionality to set state at certain time


After a long day of research, i did not find any way to set programmable relay state at certain time (like set on at 8:00am and off at 11:00am), is there such function?

Generator assistant does seem to have such function but it is not suitable for my needs since i want connect up a load instead of charging.

Thank you.

sadojeptiska asked
sadojeptiska edited ·

1 Answer

Multiplus Ground Relay Voltage

I am troubleshooting the ground relay function. I have two multi plus II’s and an autotransformer. The autotransformer is not bonding neutral to ground when inverting, even though I have the ground relay wiring in the place and the ground relay option unchecked in the multi plus configuration. If I put a multimeter in the ground relay on the multi plus what should I read? Also what voltage range / amps can I supply the auto transformer to force the neutral to PE bond.... trying to isolate the problem....

fagan1 asked
Yusef Neblett edited ·

2 Answers

Is it possible to control the relay on a BMV-712 over VRM?

Is it possible to manually control the relay port on BMV-712 with VRM, running on a Raspberry PI.? Just a simple on/off button starting the remote console in VRM ?

veas asked
rainerb commented ·

3 Answers


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