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How to tell why system is dropping grid

The last couple of days my 3 phase multiplus II 5kva system has been deciding around 11am to disconnect from the grid and run off of battery/solar until around 4pm.

I presume the system is upset about grid voltage or something, but I can't actually spot any place inside the Cerbo GX that may indicate what it considers to be the problem.

As far as I can tell, the grid voltage on all phases is less than the overvoltage 10 minute average value configured in ve.config for each multiplus.

daryl asked

0 Answers

ESS and Freedom Won Battery

I have been working through a number of threads to find a solution to the draining of Freedom Won battery prior to being fully charged by PV, where loads in excess of PV supply is sourced from battery (and not grid).

My system setup as follows:

MultiPlus II 48/5000

Victron MPPT 150/85 Te VE-Can

Cerbo GX

FreedomWon 10/8 (200Ah)

Lynx Power In

3.2kWp PV (3x3)

I have set battery SoC to 60% with an aim to use 40% during night to feed critical loads. I have noticed two issues though:

  1. The battery supplies power to both critical and non-critical loads, which causes it to drain too fast.
  2. During the day while battery is charging via PV, it keeps on using battery power for loads prior to being fully charged. This slows down charging and often does not reach 100% at end of day.

I suspect this is an ESS setting that I am missing. Any advice?


brianor asked
warwick commented ·

2 Answers

Multiplus II ESS grid changeover Issue, resetting appliances

I have a Multi II with a 7.4kWh lithium and 4.3kWp PV and Smart Solar 250/100 coordinated via CerboGX on ESS with self consumption and battery life optimisation

I’ve noticed that when there is grid interruption there is an output break of sorts lasting millisecs. The ledTV, AV system, satellite TV decoder (reboots) and fridge all see the break. These devices have surge protectors I must add (could they be reading the millisecs changeover as a surge?).

When grid is restored the same thing happens. I didn’t have this with a Voltronics inverter. Sometimes even with stable grid sometimes it happens. With grid around this is preceeded by a humming sound from the multi. I cannot speak to the quality of the grid. We are coming from 12hr load-shading in last year or two so supply is meant to be stabilising. Quality issues on frequency affecting Multi?

To stop this annoying ke I switch off AC supply to the multi. But I had needto switch it back on and noticed this issue when there was a 5hr grid interruption. Anyonecare to explain this?

i can run offgrid but do need grid to support load when batt goes below 20% as set in ESS. if off I do get wuite low at times. System can be viewed here:

kalito asked
Paul B answered ·

2 Answers

Why does "Limit Inverter Power" work, but "Limit Charge Power" does not in ESS?

I am running a MultiPlus with ESS Assistant installed. I had charge current set to max in VEConfigure, but had Limit Charge Power turned on in ESS, along with Limit Inverter Power.

This had been working just fine until I had to remove the BMV-712 temporarily. When I did this, I turned on the Battery Monitor option in VEConfig for the MultiPlus. I set the Battery Monitor in Venus OS in System Setup to the MultiPlus. However, now whenever charging occurs, it is at the maximum current, not what I have set Limit Charge Power to. Can anyone explain why this does not work with the MultiPlus Battery Monitor, but Limit Inverter Power does?

ee21 asked
chuff answered ·

2 Answers

certificat vde0126 easysolar II ESS pour la France ?


Je viens de terminer une installation ESS avec un EasySolar II GX 48/3000 et des batteries Pylontech, un CPI sur le DC (car 210Voc), et je suis en train de remplir le dossier consuel.

Et là, impossible de trouver le certificat vde0126 pour le easySolar II. Il est disponible pour le multiplus II pour la France, mais seulement pour les autres pays pour le easySolar II

Du coup comment faire pour le consuel ?


yann asked
yann answered ·

7 Answers

3-Phase Multiplus II GX ESS - Feed-in not controlled

Hi Everyone,

I have logged two other questions on the same issue and has not resolved the issue. I am again asking the question should someone has seen this before. Currently the local wholesaler and Victron is attending to the issue, but are not making progress.

The above is more for background as I will attempt to continue to describe my thoughts below which might help or not.

The three pictures below show some details on the respective phases. As explained previously the issue is most prevalent on L1, less on L2 and absent on L3. I have moved inverters between the phases and the issue remains on L1 thus it doesn't seem to be inverter hardware related. Could still be software or coding, they have however all been upgraded to the latest version.

The wholesaler has also reconfigured the system from a software perspective and the issue remained.

I will start below with L3, which I believe is working correctly:


As can be seen on the System - Grid graph the L3 line stays above feed-in to the grid and the average current on the AC Input Voltage and Currrent - Phase 3 graph is around -8A. The load on this phase at the time is approximately 1.8kW and although quite noisy is relative consistent when looking and the calculated non-critical load side throughout the period that the element is on.

On the opposite side the L1 phase reacts completely different as per below:


During the same period, you can now see that L1 pushes power back onto the grid. The AC Consumption calculation becomes very erratic at this stage and seemingly due to the system trying to calculate the additional load on this phase and significantly overshoot. The AC Input current averages at approximately -16A during the period which is double what is seen on the other two phases.

During this period on the remote console the system seems to jump as can be seen on the peaks of the AC consumption and then slowly regulate back to the required power and seemingly jump again as soon as it gets back to the correct power. IT seems that there is a calculation error as soon as it gets back to balance that makes the inverter over-react to try and accommodate these calculated excessive loads. This then just push back onto the grid until it can then correct itself over a few minutes.

Any help, suggestions or requests for more information would be appreciated and accommodated. At this stage we are not making progress with the local support and it seems their next option would be to strip out the whole system to take back to their office to test.

Johan Pool asked
markus commented ·

1 Answer

Systeme coupure de decharge batterie suivant un créneau horaire (FR/ESS/EDF-HP-HC)


voila mon architecture et la suivante

- j ai un Multiplus 5Kva raccorder à une batterie plomb carbone en 48V de 440ah

- un régulateur MPPT 150/85 avec 2640w de pv

le but serai de désactiver la décharge de la batterie sur le créneau horaire des heures creuse en France de 23h à 7h.

actuellement pour se faire je suis obliger de le faire de façon manuel en allant tous les jours dans le menu ESS de mon venus Gx et modifier le SOC minium (sauf défaillance réseau) pour qu'il arrête de décharger la batterie et repasser sur le réseaux.



here is my architecture and the next

- I have a Multiplus 5Kva to connect to a lead carbon battery in 48V of 440ah

- an MPPT 150/85 regulator with 2640w of pv

the aim will be to deactivate the battery discharge during the off-peak time slot in France from 11 p.m. to 7 a.m.

currently to do so I have to do it manually by going to the ESS menu of my venus Gx every day and modifying the SOC minium (except network failure) so that it stops discharging the battery and going back to the networks

thank you

baptiste bodier asked
Stef answered ·

5 Answers

ESS system gets stuck in low SOC #1, even when excess PV available

Hi All,

I've noticed a problem in a 45kVA ESS system recently installed. Here is the set-up:

  • 3 x 15kVA Quattros
  • 63kWh of Pylontech lithium-ion batteries
  • CCGX
  • Carlo Gavazzi EM24 with CTs
  • 15kW & 10kW Fronius Symos on the AC in.
  • All loads on AC out (Critical Loads)

System works well in general, however there appears to be a conflict happening on the days when the batteries reach the 15% minimum SOC:

At night, when the battery power has been used, the system correctly goes into #1 low SOC mode and draws no more power from the batteries, and pulls from the grid.

The problem is that the following morning, when enough PV power is available, it keeps throttling back the PV inverters to only match demand. So for example: when there is 10kW of solar available and 5kW of consumption with a 2kW grid set-point; it will only produce 3kW… instead of producing the full 10kW and start charging the batteries.

I can manually “kick-start” the system out of this dead-lock, simply by lowering the minimum SOC to 10% and restoring it 15%. The #1 state then disappears and the full 10kW is produced, charging the batteries in the process.

Having studied this over several days my theory is that there is a conflict occurring between the “phase compensation” in off-position and “zero feed-in” Fronius control.

Please note I have “no phase compensation” and “zero feed-in” set, because at the moment the system registration is being processed and no feed-in on any phase is recommended. I also have a conservative 2kW grid set-point to minimize momentary feed-in too.

My theory (and it’s only a theory) is that when low SOC #1 setting is functioning no more discharge of any type is allowed- this in effect, conflicts with the “no phase compensation”: it won’t discharge on any of the phases (good), but for some reason it won’t charge on any phases either (bad). It’s like it isolates the batteries from the system- neither charging nor discharging. The system throttles back the Fronius PV inverters in order to match Consumption minus grid set-point – instead of charging batteries with the excess solar available. And so the system stays stuck in low SOC, #1 until I kick-start it by clearing the #1 condition.

Does anyone have any explanation for this? Is this an issue Victron are aware of?

P.S. I’ve attached some screenshots: 2 of the ESS settings and 1 of the system in normal, correct operation- it hasn’t reached low SOC in the last week or so, so haven’t been able to capture that- but at least you can see how the system is set up.




lazza asked
chrisawp commented ·

1 Answer

Recommended type of RCCB for Victron Quattro 8000 running with ESS

I am located in Portugal and using a set of 2 Quattros 8000 with ESS assistant.

For the AC1 out of the Quattro it is recommended to use a RCCB.

I am using two Hager CFC240P 300mA, type AC. However they tripp quite often.

What is the advisable type of RCCB to be used in Europe for this type of installation?

AC, A, F, B ?


Carlos Carvalho asked
gro edited ·

1 Answer

MPPT 250 earth fault monitoring

In general I am very happy with your MPPT controllers, but I do have the same problem as the author of "Earth Fault Alarm Monitor in parallel to the MPPT250/100". Since there was no real solution within the answer, I suggest you built a monitoring system into the controller as all the grid inverter manufacturers do for the Australian market.

Ole Adebahr asked
energywonk answered ·

6 Answers

ESS with Time of Use tariffs?


SO I see some references to ToU tariffs in the ESS documentation, but it all seems to talk about external control (writing to MQTT or modbus registers).

I'm not scared of doing this myself, but I was wondering if there was any standard option in ESS (current or planned) to allow optimisation of costs when on ToU tariffs?

Eg, charge the batteries from grid up to xx% on the cheap tariff, then run off batteries during the expensive period...

sinbad asked
sanchuka commented ·

1 Answer

Connecting Grid to AC out

It is possible to connect GRID to AC out ? in ESS mode ?

My victron has AC in broken, unable to read Ac voltage, frequency yes. So neves connects to ac in,

It's possible to connect AC out to the grid ? I use Multiplus to charge bateries with AC coupled inverter and deliver energy to the house when it's no sum , using a victron meter.

This would be my schematic:


tiamelis asked
tiamelis answered ·

2 Answers

Ess drains batteries into grid


Has anyone seen this before where ESS drains the batteries into the grid?

malcolmurwin asked
warwick commented ·

5 Answers

ESS large battery draw on Scheduled Charge

System details :

  • MultiPlus-II 48/3000
  • Pylontech US2000B Plus 4.8kWh Li-Ion Battery
  • Venus GX
  • ESS

I'm running an ESS system and noticed that the startup of large AC loads are being powered from the battery / inverter when on scheduled charge. The scenario is as follows:

  • Scheduled charge period
  • Target charge has been reached
  • Grid is available
  • Zero PV

Under these conditions, my understanding is that the system should be relying on the grid to power the loads (with minor background losses). What I'm seeing is that the batteries are used to support the startup of large loads while the grid contribution is slowly ramped up over a few seconds. In the screenshot below, we were using a clothes iron that switched on and off frequently. This resulted in large loads being pulled from the battery each time the element switched on and corresponding charges pushed to the battery when the load switched off. Any way to change the behaviour and get the system to rely on the grid in this scenrio?




Here is less extreme example where a kettle is switched on and pulls 14A from the battery during a scheduled charge period:


kempza asked
k2aab commented ·

1 Answer

MultiPlus 24/3000 120 ESS configuration

I want to buy a MultiPlus 24/3000 120V, but need to know if it can be configured to do the following:

I have four 12V 200 Ah LiFePO4 batteries in 2S/2P for a 24V system.

2000W solar array with a Victron Energy Blue Solar 150/70 SCC.

Cerbo GX, 500A SmartShunt, and Smart Battery Sense.

Dedicated 50A electric circuit for the inverter/charger.

I would like to set the inverter/charger to use the battery/solar as priority power source. Have the batteries charge per the SCC during the day, and use grid power to assist solar or fully charge the batteries only when the solar can't keep up and/or the battery bank SOC drops below 24V.

I hope I was able to explain that in clear terms and would appreciate it if someone can give me some insight if this is possible. My research led my to several possibilities with VEConfigure assistants and ESS.

Anyone? Thank in advance.

repro asked
Kevin Windrem answered ·

4 Answers

Modbus Address 33 / Inverter Only - enabled in ESS configs


i've set this 'sub-mode' in the past for 1 or 2 days just to verify that internal consumers (incl. genset starting) works and cause no overload conditions. My current undestanding is that that setting address 33 to 'Inverter Only' the systems works as if the grid is dead, but the grid (AC-IN) is physically connected and is alive - but ignored. Now i would like to run in that mode for a longer period (still the basic configuration is ESS) so from a MP point of view it looks like a long term grid outage - what are the implications when doing so ? Charging will continue through 2 MPPTs - daily charging is enough in summer times to compensate the nightly battery drain.

best regards,


martghh asked

0 Answers

Occasionally unstable ESS


for more than 2 years I have a simple system: grid-tied, one phase, MultiPlus II 48/3000/35-32, SmartSolar MPPT 150/35, 4x150Ah AGM batteries (w/ balancer), ESS enabled, Keep Batteries charged mode, no feed-in of excess power, AC grid setpoint 75W

Most of the time it works nicely, however time to time it becomes unstable. And this bugs me a lot.

For example: perfect sunny day outside, AC load cca 1kW, battery full, but suddenly MPPT is not producing. Strange behaviour is that MPPT is switching from bulk to absorption mode (1/3Hz frequency). MPPT production cycles and tries to ramp up, eg.. 0W, 5W, 16W, 60W, 80W... and than back to 0W.

Battery power jumps from e.g. -200W... to 200W... and back.

This takes for cca 20minutes and then it is back to normal. I have not found out what causes this. It looks like something trips the whole system into unstable mode.

Any ideas?



matejs asked
cisapak717 commented ·

3 Answers

Battery Switch ON/OFF 275A

The Battery Switch ON/OFF 275A 12-48V

Can i use it in a 48V system with a Multiplus II

jens-due asked
marekp commented ·

1 Answer

BMS, Virtual Switch, ESS. Why it's not easyer ?

I have a Solar installation with LiFePo4 Battery on DC input and Grid on AC input.

LifePo4 works with Bms. If I connect the Vebus BMS to the MultiPlus, I need to add the BMS Assistant.

If I add the Bms assistant, I need to select "no vs switch" instead of "Ignore Ac Input".

Without "Ignore Ac Input", I use much more current from Grid, and too less from solar ! It's uninteresting !

So, I need ESS. But for France, with a MutliPlus v2614-481, there is no ESS Mode without "togrid" mode. So I need to buy a Ziehl anti-islanding system, which is quite expensive for an unknow result. And the main Electricity Provider of France (EDF) doesn't help small producer as me to establish a mandatory contract of buying the "to grid" energy. Well, it's very complicated and I turn in round.

Why it doesn't exist an ESS mode, without reverting to grid ? Because with "Ignore AC Input", we can't benefit some ESS cool function as : "Maintain mode", planning for loading Battery on grid, Bms Assistant, and so on".

I'm so annoyed !

Regards. Laurent

royer asked
krogerfeedback answered ·

1 Answer

Safe to run a Multiplus without grid feed permanently ?

Hi, I have 2x Multiplus 5KVa inverters in parallel with 18x 400W panels and 4x 6.2KVA batteries. I Have turned off my feed from the grid as it is extremely unreliable.

Is this safe and OK for the system to run permanently without any supply from the grid ? is there anything bad or negative doing this ?

Is there any settings I need to change to optimize the system for this scenario to be used ?

Thank you

gerhardking4 asked
wkirby answered ·

1 Answer

Active SoC stuck at 80 %

Hi! I have a question regarding the functioning of the parameter 'Active SoC limit' that can be found in the ESS. While in mode 'Optimized (with BatteryLife)' I started playing with the different parameters to test the installation, and in particular with the parameter 'Minimum SoC (unless grid fails)'. At first, both 'Minimum SoC (unless grid fails)' and 'Active SoC limit' had the same value, but after increasing the value of 'Minimum SoC (unless grid fails)' up to 100 %, the 'Active SoC limit' became stuck at 80 %.

I would like to know what does this parameter 'Active SoC limit' really mean and what's the functioning behind, so I can have a better understanding of it once I change the value of 'Minimum SoC (unless grid fails)'. I have already read the ESS Manual but it is not very clear to me yet.

I would like to add that my installation works mainly disconnected from the grid except in a few occasions that it is connected for short periods of time. I don't know if that has anything to do with the system recognizing this and, thus, trying to set a high value according to this characteristic.


inigodu asked
Hendrik Coetzee edited ·

2 Answers

ESS does not provide PV power to loads

We have a CCGX, MPPT with 12x270Wp panels, 6x Pylontech 3000C 48v batteries, and a Multiplus 5000/48/70. ESS is set to "keep batteries charged" because, we have frequent and sometimes lengthy grid outages and the main priority is to keep power on throughout those outages.

The CCGX is programmed to start a generator at 20% battery SOC. The generator is connected via an automatic transfer switch which means that the overall Victron system only sees AC power without knowing the origin.

If there is no AC power the system performs as expected: PV supplies loads and also charges the batteries to the extent it can.

If there IS AC power and the batteries are < 100% the system performs as expected: PV supplies what it can to loads AND batteries, and the AC input fills in the slack.

If there IS AC power and the batteries are full then we go off the rails. PV supplies nothing and the AC input supplies 100% of the loads.

What this means is we are paying the electricity company whilst solar power goes unused.

I am able to fix this by enabling grid-feed-in, even with a limitation of 0W. Then, the PV supplies all that it can to loads (or battery charging) and AC input takes up the slack.

However: our country has no arrangements for grid feed-in and I am not sure whether the prepaid meter will tolerate it, or be damaged. (I have set grid code Other)

1) Does grid feed-in with a limitation of 0W guarantee no power goes to the grid?

2) With grid feed-in disabled, surely ESS should prioritize PV in ALL situations to power loads as well as charge batteries? Surely that is the most normal use-case: one wants to use solar power, in any situation, before buying energy?

3) Should I be reporting this as a bug in either the ESS assistant, or the Multiplus firmware, or the CCGX ESS implementation?

nhenderson asked
Alexandra commented ·

5 Answers

Multiplus in ESS mode aansluiten op Belgisch net voor thuisbatterij.


Ik heb thuis een multiplus II GX aangesloten op het Net met een 10Kw lithium batterij.

Alles in mooi aangesloten zoals het in de manual beschreven staat en het systeem werkt ook gewoon perfect, Maar nu is de keuring langs geweest om het systeem te keuren en dat wilde hij niet doen omdat de omvormer in serie was aangesloten met het electriciteitsnet en niet in parallel. (Ik vertelde hem dat dit systeem enkel maar in serie kan worden aangesloten en dat alle meet apparatuur vanbinnen in de multiplus aanwezig is, en dat dit toestel aan alle veiligheids voorzieningen voldoet en gekeurd is door Synergrid belgie)

Kan iemand mij helpen met info of voorbeelden van iemand anders die dit ook zo gedaan heeft thuis, zodat ik dit kan voorleggen aan de keurder? Of heb ik zelf iets over het hoofd gezien?

In bijlage de schets van hoe het is aangesloten:



Met vriendelijke groeten


aaroncloet asked
Daniël Boekel (Victron Energy Staff) commented ·

6 Answers

disparity between DC energy and AC energy in a ESS three phase system, after firmware update






just finished to update the firmware for 3 units Multiplus 5 kW, including assistants by the company who sell entire system:

- 3 x Multiplus 5 kW

- 1 X Fronius Symo 10,3 kW

- Color GX

- 2 x BYD Pro 10 kW each

- Bmw 700

- 36 solar panel, each 300 w/peak

- ESS three phase system, AC coupling

during update, activities was going well, but after it was finished, we clear observe some discrepancy between energy in AC out and energy from DC part, as in the attached pictures.

please note that there is an measurement independent from Victron system.



laurentiupitran asked
laurentiupitran answered ·

4 Answers

MultiPlus II 48/5000/70-50 mit Einspeiseberenzung, Scheinleistung > 4,6 kVA


kurz vorweg meine Anlagenkonfiguration.

Module von Q-Cell:

Ost (Neigung 10°): 6 x 390 Wp = 2340 Wp

West (Neigung 10°): 6 x 390 Wp = 2340 Wp

Süd am Giebel (90° ): 4 x 390 Wp = 1560 Wp

3 x Victron Laderegler MPPT 150/45

1 x Victron MultiPlus II 48/5000/70-50

1 x Cerbo GX

1 x EM24

2 x Pylontech US3000C


Alle Systeme haben die aktuellste FW.

Die Anlage wurde mit meinem Elektriker nach meinen Wünschen vorbereitet. Die Abnahme vom Netzversorger steht bald an.

Jetzt komme ich zu den offenen Punkten:

Der Multiplus wird nur über die L1-Phase Strom an der Netzbetreiber übergeben. Hier gibt es evtl. ein Problem mit der max. Scheinleistung SEmax von 4,82 kVA. Erlaubt sind nur 4,6 kVA.

Parallel gibt es die 70% Regelung (Wirkleistungsbegrenzung). Dieses würde bei meiner Anlage 70% von 6240 Wp sind 4368 Wp.

Mit welchen Einstellung kann ich die Begrenzungen einstellen, so das auch der Netzbetreiber hiermit zufrieden ist?

Hierbei gingen meine Überlegungen an folgende Einstellungen:


Ist das richtig?

Warum steht "Feed-in limiting active" auf No? Ist irgendwie irritierend.

Ich hoffe mir kann jemand weiterhelfen, der hiermit Erfahrung hat.

Viele sonnige Grüße

Thomas Heins

Thomas Heins asked
Thomas Heins commented ·

2 Answers

low voltage cut out time delay

Multiplus 3000 low voltage cut out is set to 12.1 per battery manufacturer. If I have a heavy amperage draw such as a hair dryer I will sometimes get an initial momentary voltage drop to 12.1 before it settles in at 12.3.

The initial momentary dip triggers a Multiplus alarm and stops inverting. Lowering the low voltage cut out value is not the best option because it conflicts the the BMS battery shutdown and I'd like the Multiplus to stop inverting before the BMS shuts down the battery.

I can not find a time delay setting for the low voltage cut out to take effect. Am I not seeing it?


msmolow asked
msmolow edited ·

2 Answers

Why is the input current limit changing the PV Charger (DC Current) during feed in

Why is the input current limit changing the PV Charger (DC Current) during feed in, if I am using a number less than 7?


Multiplus II 48/3000

3 x Pylontech US2000

SmartSolar 150/35 with 2.1kw PV

Venus GX


AC coupled PV with 10kw

joe2 asked
joe2 answered ·

3 Answers

Ess Feed in limiter to 60% not active


System: multiplus 2 48/5000, ess, ac coupled system solar diehls inverter, dc coupled mppt's.

The feed in options are all on, i set to limit the feed in, but the state never says active, and all power is fed into the grid, no restrictions are happening.

Do i miss anything?

jejochen asked
pedrokinyon edited ·

0 Answers

Dashboard showing incorrect solar generation

I have installed a 5kVA Multiplus with a 5kW Fronius Primo, monitored by a Cerbo. The Multiplus is programmed with the ESS assistant, and feeds excess power back to the grid.

Although the data is captured for the consumption and PV generation in the advanced tab, it does not reflect on the dashboard. Below data from April 20 on dashboard and advanced tab. Around 20kWh generated, but only reflecting 8.4kWh. The consumption data is also incorrect.



The ESS is set on "with battery safe" and battery at 100%. I'm experimenting with lowering the value to 85%, and this seems to allow the correct new information to be captured on the dashboard, but not historic. There are 4 x US2000c batteries.

Has anyone experienced this before? If the Fronius lost comm's it could make sense, but there is no missing data.

j-n-wise asked
jbakuwel answered ·

1 Answer

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