Why does MPPT throttle to zero?

System is running ESS, Victron Multi II 5kVA and 2 x 150/35 MPPTs. The MPPTs throttle down to 5W randomly and for weeks now we have been trying to find a pattern. The only thing I am quite sure of is that it does not seem to happen when the inverter is turned off. In other words, if I allow the battery to discharge and then let the MPPTs charge but leave the inverter off, they work perfectly.

The MPPT (one or the other) will just stop producing and after typically 10 minutes will work fine again. Sometimes it takes much longer like 30 minutes.

I pride myself on being a very good trouble shooter but I must say, this is so seemingly random it is proving to be very difficult to find a pattern or nail down the cause. What I am 99% sure of is that the instruction to throttle comes from ESS and it stops happening when the Multi is turned off.

How can I get access to a Victron resource that can look behind the scenes at the messaging happening between the components to identify the cause of the throttling?

I have three large Victron systems coming up (two 90kVA and another 30kVA) and getting really concerned that we cannot get this issue resolved.

Many thanks for reading!


Hannes van Staden asked
Eduard answered ·

12 Answers

PV meter on the output of inverter data


I have an ESS running with Cerbo GX, Multiplus II, and an AC coupled inverter on the output of the multi. Until recently i didn't monitor PV production but today i installed an EM111 meter, it's communicating fine however I cant configure it that its connected on the output of the multi. I select the position of the meter "AC Output" but its reverting back to "AC Input 1" once the page refreshes.

This causes "AC Loads" calculations to be incorrect.

I did set up in ESS assistant the PV inverter on the output and by the looks of it the generation is being counted twice.

Thanks in advance for assistance




apple047 asked
apple047 answered ·

1 Answer

ESS multiplus II 48/5000 Strange behavior. charge/discharges continuously


I have a Multiplus II 48/5000 GX, ESS system Parralel connected with current sensor. Everything is connected on the AC-IN. There are no loads on the AC-out. I have a solar inverter but no current sensor for that. It has a 18 cell LiFePo4 battery with JK-BMS. There is no communication between the BMS and the Victron GX.

Mostly it works fine, but sometimes (not always) when there is not enough solar It has a strange behavior. On my BMS I can see that It switches to charge/discharge continuously within a second. (+10A/-10A). Also you can hear that the inverter is has to work hard. The ventilation is working. The Victron dashboard shows also something weird:

The "mains on" and "inverter on" blinks. The bulk led is orange. But this is a situation that is not possible. It is getting more power from the grid and battery than it needs power for the loads.

The battery percentage is also showing wrong values because of this problem.

When this happens, I can solve it by turn off physically the Multiplus and power it back on. Or, everything goes back to normal when the sun can provide enough solar power to provide the loads and charge the battery.

Could this be an error in my settings?

heinvdb asked
howell edited ·

1 Answer

Nulleinspeisung mit Phasenkompensation mit Gavazzi EM24 an MultiplusII 48/5000/70 single phase mit Pylontech Akku

Hallo Community, ich habe eine Frage bezüglich meiner Anlagenplanung.

Ich möchte gerne meine zukünftige PV Anlage (4,8 KWp) über den WR Multi+II 48/5000/70 + MPP150/100 und Cerbo GX mit 4 Pylontech 2000er Akkus einphasig (L1) ans bayrische Stromnetz mit dem EM24 durch Ausnutzung der Phasenkompensation anschließen. 63A Hausanschluss.

Es soll keine Einspeisung erfolgen. ("Nulleinspeisung")

Vorrangig sollen die Akkus nur über PV geladen werden und bis ca. 50% Entladung Phasenkomensation machen.

Soweit ich gesehen habe benötige ich dazu eine moderne Messeinrichtung mit Zweiwegezähler und Stammdateneintragung.

Ich habe Fragen bezüglich eines Netzausfalls.

- Was passiert im Fall der Notstromversorgung bei Netzausfall auf den kompensierten Phasen ? Wird dann nur noch L1 notstrombedient ? Wie hoch wäre dann die max. Belastung auf L1 ?

Oder wird nur die AC-Notstromdose (critical) des WR z.b. für Hausbeleuchtung oder Pumpensteuerung für eine Heizung bedient ?

- bei normalen Betrieb mit Kompensation liegt die Spannungsdifferenz zwischen den Phasen bei 400V. Wie reagiert der WR bei Netzausfall und was wird passieren wenn das Netz zurückkommt bezüglich der Hausfrequenz.

Ich freue mich auf ein feedback

prosolar24 asked
prosolar24 commented ·

2 Answers

Limit Charge Power - setting missing on ESS

I know that was already asked several times, but the solution is still missing.

The "Limit Charge Power" is missing from ESS menu, and if I got it right, this was the only solution to avoid charging batteries from grid, or, to set a certain limit. I know that there is an option in DVCC to limit the charge current, but this affects overall the charging, including the current drawn from a PV-tied grid inverter. In previous questions, disabling the DVCC was making the option to appear in ESS. Still in my case, using Pylontech batteries, I need DVCC on.

So, what is the solution to have the Limit Charge Power back on, regardless if DVCC is on or off?


cristimv asked
cristimv answered ·

2 Answers

ESS: Setting at Optimized (w/ battery Life), but MPPT does not supply together with Grid

Hi everyone.

Our set-up:

Quattro with 400AH, 48VDC lead acid batteries, Smartsolar 250/100 with 4kW PV.

ESS set-up, load is a water pump consuming around 5kW. We set it on Optimized w/ Battery Life. Min SOC @100%, Active SOC 100%.

However, the batteries get discharged and supply the load together with the PV, with the Grid only on standby (only around 100W which was the grid setpoint).

Then when battery SOC reaches around 97%, the Grid supplies the load entirely (passthru) and the PV only charges the battery. When the SOC reaches almost 100% , the PV output is only around 1kW, even though the sun is up and we are expecting a high output from the PV.

The systems remains in this condition, with the grid supplying the load and no PV power supplementing the grid.

We also tried Keep Batteries charged. But still the same. Only the grid supplies the load and the PV only charges the battery. BUt when the SOC is already 100%, the PV output is very minimal and only supplies the battery at float charge.

Hope anybody can give us any idea why this is happening.

JimV asked
JimV commented ·

1 Answer

Multiplus 2 - 3 phases - ESS mode 3

Installation with 3 Multiplus 2 + BYD batteries - Venus GX - ESS mode 3

Our controller is communicating with Venus GX by Modbus TCP.

When sending a modbus command on slave id 242 , register 37, we control A phase of the system correctly.

Therefore, when sending a modbus command on slave id 242 , registers 40 and 41, we get the error " GatewayPathUnavailable"

How should we control B and C phases ?

avnor asked

0 Answers

ESS Charging state misleads the SOC value


My SOC increases even while the battery is discharging.

I have noticed that when using ESS the Inverter is always showing charging in the VBUS state similar to this post: https://community.victronenergy.com/questions/32283/ess-ve-bus-state-charging-behaviour.html

I have scheduled charge at 00:30 for 4 hours, so at 4:30 the MPII starts inverting to supply the house load. However the Charger side of things seems to continue the Bulk-Absorb-Float cycle. This causes the SOC to jump to 100% even though its been discharging for nearly an a hour. I suspect this is due to the 1 hour Absorption timer.

Is this expected operation? It doesn't always happen and is not consistent and causes different depths of discharge.

This can be seen in the graphs below with the jump in SOC happening at approx 05:30.

Many Thanks


marv2097 asked
marv2097 commented ·

1 Answer

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
daniella edited ·

3 Answers

ESS Battery Size tied to whether "Enable battery monitor" is checked

I routinely untick "Enable battery monitor" because the batteries we use always have an internal BMS which provides SoC et al.


I noted today during a commissioning that the size (Ah) of the battery in the ESS configuration is tied to whether the battery monitor is enabled or not on the General tab.

With "Enable battery monitor" ticked:


With "Enable battery monitor" unticked (note also the two mentions of battery capacity differ 10Ah vs 0Ah):


warwick asked
warwick commented ·

2 Answers

ESS mode 3 - charging EVs

Hello Victron community,

We are using Quattro 48/15000/200-100/100 with CCGX and our own battery and BMS. We are going to connect the system to a charging site which includes 3 single phase chargers and currently each of them is limited to 3.6kW each.

With the system installation, the chargers would be able to go up to 7kW each, by providing ~10kW of battery power out of 20kWh battery bank.

We are using our own control loops which means we operate the system on ESS mode 3 and managed to communicate and control the inverter pretty well.

However, when tested the inverter in the lab with a simple heater of 600W as load and smaller battery pack of 2kWh, it seems that it couldn't handle this peak and move itself to passthru mode...

When we went back to the manual we noticed that there is a constrain of 400W/s ramp up time. However, in our site we don't have a precise control on the ramping time of each charger on site.

Need some help to understand how should I manage it?

- Is the inverter limited to work just with a loads that can be managed to 400W/s?

- Is that relevant for ESS mode 3 only? Can I operate it in other mode and avoid this restriction?

Would appreciate any suggestion or assistance on that

Let me know if any further information is required.

Thanks in advance

sparkion asked

0 Answers

Multiplus II entlädt die Batterien nur bis 97%. Ohne Solareinspeisung MPPT 150/35 wird überhaupt nicht entladen

Hallo an alle.
Ich habe seit Oktober einen Multiplus-II, Cerbo GX, MPPT150/35 und 3 Pylontech US2000. Auf dem Dach sind je 6 Solarmodule an der Ost- und Westseite montiert.

Alles zusammen funktioniert soweit problemlos. Gedacht ist es als UPS für kritische Lasten (Server, Telefoanlage, Heizung, Beleuchtung, Gefriertruhe). 50% der Kapazität der Batterien reicht für den unabhängigen Netzbetrieb über die Nacht aus, bis wieder Solarenergie zur Verfügung steht.

Der SOC Mindestwert ist ist im ESS auf 50% gesetzt. Das hat aber keinen Effekt! Steht Solarenergie zur Verfügung und ist die Ladung bei 100%, wird kurzfristig die Last aus der Batterie und Solarenergie versorgt, bis der Ladezustand bei ca. 97% ankommt. (49,7V an der Batterie). Danach wird die Batterie wieder geladen. Kommt mehr Solarenergie an , als benötigt, wird in das Hausnetz eingespeist. (Gridmeter soll auf 0W gehalten werden.)Bleibt die Solarenergie aus, wird die Batterie nicht mehr entladen und bleibt bei anfangs 100%.

Ich würde gerne die Batterie über Nacht bis zu der eingestellten Grenze von 50% entladen und erst dann Energie aus dem Netz nutzen.

Das gelingt mir nur, wenn biem Multiplus-II "Netz ignorieren" aktiv ist.(Trennung vom Netz bis eingestellte Grenze erreicht ist) In dieser Einstellung funktioniert das Einspeisen ins Hausnetz aber nicht mehr. Bei guter Sonneneinstrahlung wird der MPTT gedrosselt und ein Teil der Energie geht "verloren", den ich im Hausnetz hätte nutzen können.

Die Firmware habe ich bei allen Komponenten im Oktober aktualisiert.

Ich habe schon zahlreiche Konfigurationen durchprobiert, kann aber den gewünschten Ablauf nicht erreichen. Stehe ich hier selber auf "meiner Leitung"?
Irgenwie finde ich den Einstellknopf nicht!

Für Hilfestellung bin ich dankbar.

christoph asked
christoph commented ·

2 Answers

Schedule between "keep batteries charged" and "self-consumption" in the ESS program

Good morning. Can someone please suggest me to schedule the change the state between "keep batteries charged" and "self-consumption" in the ESS program? Let me explain better, living in a country on the equator with 12 hours of sunshine and 12 hours of darkness a day all year round, I would like to use self-consumption during the day but switch to "keep the batteries charged at night.

My installation:

Victron Quattro 10KW 48V

Frunius 8.2

10Kw solar pannel

Small battery bank 200Ah (which will later be increased ).

Currently everything works well in "Keep the battery charge", and I'm happy, but during the day I waste a lot of energy coming from the panels, and at the same time I wish the batteries were 100% charged at night.

Kind regards

aldo asked
aldo answered ·

4 Answers

ESS - System overview - AC-Input: Not available / EM24

Hallo zusammen,

wie kann man den Fehler im Dashboard beheben? Hat jemand eine Option gefunden?

Danke für eure Hilfe.



how can i fix the issue in the dashboard? Someone have a solution for me?

Thanks for your support.

my config:

Multi Plus 2 (3000) + energy meter em24 + (Raspberry Pi running Victron’s Venus) + Mppt 150/35 + lifepo4 akku

martin-27 asked
martin-27 edited ·

0 Answers

ESS mode ignores BMS BMZ ESS-X control

I would like to ask if it is normal that ESS mode ignores BMS control from BMZ ESS X battery. Configuration 3 x MPII, 3 x BMZ ESS-X, MPPT 250/85, Fronius Symo and AC OUT1, Cebo. All devices have the latest version of FW. Unfortunately even if the BMS battery sends a parameter - CCL = 0A:




so the batteries are still charging. The charger is set according to the manual for BMZ = Absobrtion time = 1. Unfortunately = Absobrtion time is never one hour, even 7 hours at a time.


Status code # 3 should appear in ESS mode: BMS disabled charging, I've never seen it with BMZ ESS X in ESS mode. I run another 4 similar systems with BMZ ESS X and I have also never seen status code # 3: BMS disabled charging.

I'm worried about the batteries, about the safety of operation. I think I overcharge them this way and they could be damaged. Please tell me if this behavior is normal (the battery is not overcharging) or if it is an error. Thanks Ondra

ondra asked
Daniël Boekel (Victron Energy Staff) commented ·

1 Answer

Consumption on non-backup phases under critical loads


I have a system installed as per below:


The issue that is occuring is that the AC loads in L2 / L3 are showing up in the critical load display and my PV inverter shows as just one figure where it used to show per phase. This occurs during the day when there is PV being generated.

At night time, it appears to display correctly as per the below screenshots:



My ess settings are as follows for the site:


And my energy meter settings are



I would like to know if it possible to correct this with the current setup on site?

Matthew Walsh asked
Matthew Walsh commented ·

1 Answer

AC Current Limit when using ESS as a grid parallel system

I have a Multiplus II GX system which is installed with the ESS application. It's connected to the UK grid via a single phase 100A supply, connected to AC IN of the Multiplus.

All loads and an AC coupled solar inverter are also connected to AC IN of the Multiplus.

The Multiplus is able to balance the grid supply close to zero, charging the batteries off of solar and discharging them as required. I also have time of use tariff which enables the Multiplus to charge the batteries over night.

The issue I have is that I run a lot of loads over night in the cheap period of my tariff including a 32A electric car charger. This regularly take my load over 50A.

The Multiplus needlessly regulates its own charger down in this period and on occasion supplements my grid supply from batteries. This is needless and results in me not having a full battery bank at the end of the cheap time-of-use period.

I can't increase the current limit beyond 50A on the Multiplus or seem to disable it. It is not needed in a parallel grid connection as I have it, as far as I can see.

Can somebody advise me as to whether I have missed a setting or if this is something Victron need to consider in a future firmware update. I want to be able to heat my water, charge my car, batter bank, run my dish and clothes washers during my off peak period!

Marcus Fosker asked
elel commented ·

3 Answers

feed in excess power not working in absorption phase

Hi Community,

my Question:

How can I manage to feed in excess solar power during absorption phase as well?

my system:

  • Octo GX
  • 3 pcs MultiPlus-II (3 phase connection)
  • 3 pcs DC Coupled MPPT Solar charge controller
  • 2 pcs AC inverters from SMA connected to the UPS side of the MultiPlus each per one phase (L2 and L3) but not yet measured with energy meter.
  • 48V lead GEL battery

how the system behaves, see image below

  • battery is in absorption, so DC voltage constantly 57.5V in this phase
  • AC power from SMA inverters on L2 and L3 is used to charge the battery
  • excess AC coupled PV power is feed to the grid so far so good
  • but DC coupled PV charger power is drastically reduced in order not to exceed 57.5V (in the image below reduced to 236W but often to as low as around 50W)
  • The available DC coupled PV power at the time would have been around 1.5kW
  • As soon as absorption phase is completed the DC coupled PV power goes up to the maximum as per solar input and the system starts feeding excess solar power to the grid.
  • see second image as well, this was an overall clear and sunny day. so no need to reduce solar pv power on lunch time. should be a "nice" daily full power PV curve.

My config:

  • DVCC enabled
  • SVS enabled
  • STS enabled
  • feed in excess solar power enabled
  • battery monitor is MultiPlusII on VE Bus

Best regards,



matthias-roetzer asked
matthias-roetzer answered ·

7 Answers

Frequency shift without ESS


I am currently testing having PV inverter on the AC-out side of my MP-II.

The ESS is not yet implemented because I do not know yet if ESS will work without Power Meter.

The worry I have is, what will happen when grid fails, my battery is full and PV is producing allot of energy that has nowhere to go.

Will there be frequency shift sent to the PV inverter to turn it down, or it is only done when the ESS assistant is loaded?



marekp asked
marekp edited ·

1 Answer

What devices allow for Cerbo GX to have AC power readings

I'm trying to finish and RV / Camper Install and having a bit of a hard time finding right details for getting AC power to show up. I've found other posts talking about using ESS and also mentioning using quattro or multi plus for v120. This RV is only a van and I don't have the room to install one of those large units. I currently found room for a cerbo gx and touch 50 and BMV 712 and MPPT BlueSolar 30. I currently have tiny progressive dynamics 45 amp charger and AIMS inverter with transfer switch that barely fit. The phoenix smart (Replace AIMs unit) units might fit but I'm worried this wont put data up on the Touch Gx 50. I've see ESS but read the same thing that AC input or output won't work?

I would like to measure display on main screen:

Watts power going out through the Inverter

AC from generator (I could still see its power DC through the BMV Shunt)

AC going into the RV

I love giving victronenergy my money for high quality products but it appears space in my RV might be an issue on this one. With that being said has anyone figured out how to change values on the main screen (QML?) or can I build some esp/rapberry pi thing to pass in on a DBUS?

burnttech asked
aph commented ·

2 Answers

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

ESS without power meter


After listening to the "ESS systems" event I am still not sure if I can have ESS system without Power Meter when my PV inverter is AC coupled but it does not talk to GX device.

I thing, for the PV inverter that does not communicate with GX device, I would need to measure PV energy generated by this inverter with a Power meter that is connected to GX device, so the system knows how much energy is getting from the Sun.

Am I correct?



marekp asked
marekp commented ·

2 Answers

VRM 276 Grid lost alarm keeps popping up after clearing

I've installed a Cerbo GX connected to VRM and it gives a 276 Grid Lost alarm about every 8 hour (clearing does not help). There is a Multiplus connected but it is set to "off". I read a lot of threads here and they are talking about this problem occuring in older softwareversions (<2.60) but I've got the problem with the newest version. By the way: the error is NOT visible in remote console....

What to do?


pim asked
pim commented ·

3 Answers

ESS - Not reaching lower limit SoC

Hello. I built my first ESS the past few days, but having a issue with the system not wanting to drain the batteries to my configured lower limit SoC. My setup consists of:

1x MG Master LV 600A - Connected to Cerbo using VE.Can

2x MG 5000 Wh 24V 200Ah batteries in series, thus 48V (=10 kWh)

1x Victron Cerbo GX + GX Touch

1x Victron MultiPlus-II 48/5000-70/50 - AC Coupled to grid on AC-in. Outputs are unused.

1x SolarEdge Inverter - AC Coupled to the grid

1x EM24 Ethernet grid meter

The issues are:

  • At basically any SoC, while discharging, the low batt warning starts to blink.
  • At around 60% SoC inverter stops and low batt is continuously on

I noticed a few things:

  • In VE.Configure I can't select lithium battery system. It only shows Gel/AGM, LiFePo and some other battery types. But not 'Li-Ion' . Should i choose LiFePo ? Or what should i choose?
  • The cut-off voltages in the ' Inverter' tab in VE.Configure look okay (37,2V, 43,6V and 43,6V). But from what I understand, those voltages are ignored?

My settings:

Settings -> ESS -> Mode : Optimized with BatteryLife
Settings -> ESS -> Minimum SoC : 10%
Settings -> ESS -> Active SOC Limit: 15%

Settings -> DVCC -> DVCC: On
Settings -> DVCC -> SVS: On
Settings -> DVCC -> STS: On
Settings -> DVCC -> Temperature sensor: Automatic
Settings -> DVCC -> Used Sensor: Lynx Ion BMS 600A on VE.Can
Settings -> DVCC -> SCS: On
Settings -> DVCC -> SCS Status: Disabled (External control)

Configured battery type:

LiFePo4 with other type BMS (Connected via CAN-Bus)

My questions:

  • Which battery type should I choose in the ESS Assistant?
  • What should my sustain voltage me? According tot he battery datasheet the cut-off voltage is 21V. In series that would be 42V. Should I set the sustain voltage to 42V or not?
  • Should I enable BatteryLife with MG HE Lithium batteries? Some Internet answers says BatteryLife is not intended to be used with Lithium batteries, yet VE.Configure enables is.

Most important question:

  • What should I change to allow the system to discharge to my Minimum SoC = 10%

tozz asked
tozz commented ·

5 Answers

Peak shaving while charging from grid

I am looking at buying a Multiplus 48/3000/35-32 with the GX controller to combine with a 16kWh BYD battery and solar panels. I looked through the documentation but could not find information on my use case.

One of the reasons that I want to buy this setup is to do peak shaving. From what I understand from the documentation, the default setting is that you do ‘peak shaving’ when the battery is full but that it will shave to (close to) 0W. When the battery is depleted, peak shaving will stop and you will go to the grid for 100% until the PV charges the battery again or you specify a charging window from the grid after which it will resume.

The issue I have with this setup is that (most probably) next year, we are going to be taxed based on the maximum power demand from the grid in a 15 minute window over a month. So using 10kW during 15 minutes anytime in the month will determine the amount we are taxed and each higher peak value will be much more expensive than the lower one. The goal for the peak shaving would be to reduce this maximum peak but when the battery would be depleted early in the afternoon, generating a single high 15‘ peak in the evening at any time during the month will make the battery investment worthless for this purpose.

I did find that you can set the grid power but that seems to always apply and in December for instance, I have days that only 10kWh is used at the moment but also days with 50kWh. Setting the grid parameter to 2kW would mean that the battery is not used at all during the 10kWh day but would still be depleted after a few hours on the 50kWh day in turn causing a power peak once the battery is depleted. As the goal is also to use the battery to charge during the off-peak hours and use that energy during the day, not using the battery on the 10kWh day will negate the benefits of the cheaper off-peak energy cost.

My question now is: is there a way that you can set a certain limit (e.g. 40% charged) after which the battery starts charging from the grid at e.g. 3kW up to e.g. 70% but when there is a total power request from the grid of e.g. >6kW during the charging, it will kick in and deliver the requested power above 6kW and starts charging to the requested limit again once the power drops below 6kW? When the charging is done, it can return to 100% peak shaving to (close to) 0W down to the 40% level at which the charging starts again. In short, I want to set a limit on the power drawn from the grid at all times and the battery would have to do peak shaving when the demand is higher and charge itself (from the grid if there is no PV) to a certain level when there is less demand while still offering the peak shaving during the charging.

If this can be done through an API or other interface that would also work but (again, from what I understand) the battery would not be used at all during a charging window which might again lead to peaks while charging which is what I wanted to avoid. If this is not possible now, do you think this is something that can be included in a firmware update in the future as for the Belgian market this would be an extemely useful feature starting next year?

tubeman asked
Alexandra edited ·

1 Answer

Grid independent ESS

I have a multiplus ii 48/5000/70-50, DC PV array, Battery with built in BMS, MPPT and CCGX running ESS.

I want the system to run grid independent - using only PV and battery unless battery gets too low or load gets too high.

We have a very unstable AC input with large fluctuations of input voltage that result in regular inverter overloads and grid disconnects, even when the grid is available.

We have used the programmable relay assistants to prevent AC 2 out disconnect with the grid disconnections. (This is working well)

I want to use the Generator Start - Stop assistant to ignore AC input above a specified SOC and below a specified AC load. The point is to minimise exposure to the unstable grid input, but have it available when needed.

I have created the following config... not yet uploaded...




Will the assistants work together to give the outcome described above?

Is the order of the assistants correct?

Is there anything here that could cause damage to my system or electrical appliances connected to it?

guydusautoy asked
josefa edited ·

3 Answers

MPPT 100/20 Voltage Drop, how do i check if the internal is brocken?

Hello Community,

i tried to finally connect my Panels first Time with the MPPT 100/20 and sadly the only thing i can observe, there is a huge voltage drop from 52V to 5,2V. Bluetooth is working. Connected via VE.Direct, everything seams to be fine. Fuse checked, ok, polarity checked, also ok. What else i can try? My thought is that there might be an internal fuse broken? Is there a way to open and check the MPPT? I tried already, but it seams to be glued together.

Thanks for advice and have a nice Weekend.

Cheers, M<arcel

Device list:

Multiplus 12/1600/70 (old microprocessor, sn starts with 19)

Cerbo Gx with Toch Display

Lynx Power In (Modified with Fuses like Lynx Distributor)

Smart MPPT 100/20

Smart Battery Protect

Smart Shunt

swellmarcel asked
swellmarcel commented ·

0 Answers

Multiplus II ESS Mode 1 latency and limits

Hi folks,

I just installed a 3-phase ESS Mode 1 with 3 multiplus II 5000-70-50. Since there is a lot of PV installed yet, I decided to connect the PV on AC-Input, and installed an EM24. The installed battery is a pylontech US3000 rack with 2 stacks of 6 battery piles.

I got some error messages about high voltage, but found the information in the tutorial for pylontech batteries about 52V..

The reason I'm writing is the discharge behavior of the multiplus. The latency ist very high (serveral seconds for a load of about 2000W). I searched for a reason, and found a 400W per second limit referenced to the grid codes. Is there any posibility to adjust this value?

The software is up to date (2623474 on the multiplus und 2.54 on the venusGX).

Best regards


christian-dorst asked
jacola commented ·

1 Answer

Power Assist function on AC IN Quattro

Hi, Experts.

The picture shows the connection and functions. Will this work? Any HELP! Thanks


kuban-invertor asked
kuban-invertor answered ·

4 Answers

ESS system doesn't react not balanced to high AC-load

Hello Specialists,

I run since several weeks a 3-phase ESS installation with Multiplus-II 3000, 48V, a grid based 3-phase PV and a 8 pieces Pylontech stack with US2000. It works quite okay and perfect. But based on certain circumstances it has behaviours I don't understand. I hope somebody can have a look and give my feedback.


On L3 is charging a Nissan env-200 with about 3,6 kW. Based on the remote console I see that the systems buys AC energy from the grid L3 with 1,2 kW and 3,2 kW is discharged in DC from the batteries. PV is very low, is equal to 0. The ESS system delivers/buys in total about 4,4 kW energy for a total AC load of 3,9 kW and with respect to yield of converting DC to AC I think this balance is correct.

I understand that a Multiplus-II 3000 is only able to deliver 2,4 kW AC which fits perfect with the grid buy of 1,2 kW to the total of 3,6 kW load on L3.

Question: Why is "no-traffic" on L1 and L2?

There was some time ago a similar discussion from @gnagflow but I couldn't find there a final solution. As I didn't wanted to hijack his thread I made my own question. But in this thread there was the hint:

... you have to turn phase compensation 'off' to get ...

I tried both settings the standard, "total of all phases" as recommended as standard


and "individual phase"


but it didn't change in behaviour of L1 and L2! It looks to me, that the Multiplus for L1 and L2 are in standby, isn't it?

I checked what could cause this "unbalanced" answer of the ESS-system. There was no battery discharge limit, it was set for 200A, the battery temperature was normal with 22°C - I have seen in the past discharge value of the batteries up to 180 A for high 3-phase AC loads, so each Multiplus is able to use individually 60 A to do it's job.

In Victrons ESS documentation there is mentioned:

"Phase compensation enabled (default & recommended)

ESS balances the total power (L1 + L2 + L3) to 0 W.

Intelligent optimization of the balance between the phases

ESS intelligently optimizes the balance between the phases -
as far as possible."

"as far as possible" - Where is my missunderstanding or my problem?

What can I do to puzzle it out?


dayandnight asked
derbernd commented ·

3 Answers