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proposed ways to control 'ignore AC Input'


building a larger and more complex system (including 3Phase, Solar, CHP machine etc.) i would like to, by software, force the 3 MPII (one on each phase) to enter the 'ignore AC Input' state in order to make sure no power is feed back. The main parameter is the SOC which should drive that state change. I would like to avoid physical relays and cables and use the existing communication between the GX device (Cerbo in my case) and the MP systems. What is the best/easiest/safest way to accomplish this ?

best regards,


martghh asked
Paul B answered ·

1 Answer

Fronius Zero-feed-in wastes up to 90% of capacity - improvement required

Hi All,

With this documentation I like to demonstrate that Fronius Zero-feed-in algorithm ignores up to 90% of available energy in a zero-feed-configuration, although all produced energy could be fed into battery at that moment.

@Victron&Fronius-Developers: Please read this article and translate improvements into next software releases.

Generic problem description

My PV panel power balance between MPPT-fed and Fronius-fed energy ratio is about 45% vs. 55% (my complete topology is described below). This screenshot demonstrates that this ratio can be also effectively generated and loaded into AC-IN and battery as long as the grid is disconnected from MultiPlus-II.


Only 30 seconds before when grid was still connected, I took that screenshot. You see that MPPT has nearly the same output, but the Fronius delivered only 28% of its actually currently possible capacity. Since the previous screenshot was taken before, it demonstrates clearly that at that moment there was no restriction of the battery taking additional energy (charging limit of 242A current allowed by BYD at that moment of time).


Frist conclusion
Fronius Zero-feed-in feature in Victron ESS wastes plenty energy (>75% in average – up to 90% in peak)

Closer analysis
Following analysis demonstrates that Fronius Zero feed-in mechanism only works as long as you have a steadily deviating power consumption. Otherwise it wastes plenty energy.

1. AC load on AC-OUT consumption is currently low at 249W and Fronius feeds in with 934W only (compared to screenshot in step 3 you see that was is only 50% of the available capacity at that moment).


2. Switch on a mentionable load on AC-OUT1 activates the Fronius within a few seconds to leverage full available capacity.


3. After having switched off the additional load, Fronius continues to produce similar but already slight lower volume. The produced capacity is fed mainly into battery.


4. As long as there is no peak any more on AC-OUT1, Fronius lowers its production steadily down. In that example its returned to 23% of currently available capacity.
Battery SOC was 52%, the currently applied current 52,9A with readiness to take 242A at that moment.


Please improve zero-feed-in feature so that also battery will be effectively loaded with available capacity on Fronius attached PVs.

My environment

· 3xMultiPlus-II 48/5000/70-50 in 3-phase (firmware 477) with a ESS zero feed-in configuration

  • ESS zero feed-in configuration
  • Multiphase regulation on single phase
  • Grid setpoint defined at 80W

· Fronius Symo 6.0-3-M (firmware 3.16.7-1) with 6.030 kWp attached (55% of total PV) – connected to AC-OUT1 (critical loads) – no additional smart meter - sunspec activated

· Victron MPPT VE.can 250/100 rev2 (firmware 1.06) connected via VE-Bus with 5.025kWp attached (45% of total PV)

· PV modules all with absolutely identical direction and no shadowing

· BYD LV 15.4 (allowed charging and discharging current during the test procedure 243A)
BMS connected via CAN-bus (firmware 1.16)

· VenusGX (firmware 2.60)

· Any component with latest firmware as of today


thomasw-1 asked
ossi commented ·

2 Answers

Cerbo GX and BYD Premium HVS compatibility


Recently I've bought a cerbo GX with the purpose to be connected to an BYD-Premium HVS 12,8 kWh. However, the BYD battery doesn't appear in the remote console. I've already apply all the specific instructions that appears at:

Cerbo GX and high voltage BYS batteries aren't compatible? There is some way to be both connected?

Thank you very much!

pablo-ayuso asked
ess-and-solar-solutions commented ·

2 Answers

Within 2-3 days SOC dropped from 90% to 7%
As you can see from the attached graph SOC dropped from 90% to 7% in the span of 2-3 days.  The system has been up and running since June and nothing like this have happened before. The consumption has been more or less constant for a long time (25W) and the only thing that draws power directly from the battery is the CCGX.

Could this drop be a result of some “maintenance” routine initiated from the CCGX or the BYD BMU/BMS?

The system consists of the following components:

•Color Control GX
•MultiPlus-II 48/5000/70-48
•BYD B-Box Pro 7.5
•SmartSolar Charger MPPT 250/60


sveinung asked
sveinung commented ·

2 Answers

Charging BYD 48V batteries with a 48V alternator

Is there any Victron products available that will allow a 48v alternator as an alternate generation source to an existing 48v Victron off grid system and connect to the BYD CAN BMS?

nrre asked
safiery answered ·

2 Answers

unexpected Inverter shutdown


after running several months with no issue at all, the MP II swicthed off and no message appeared on the GX not the VRM alarm log. Later i discovered irregular behaiviour of the SOC coming from the BYD BMS (a call to EFT is already opened) - nevertheless, i would expect some sort of logging from the MultiPlus II about that - any other location/source i could look at ? The only change within the last 2 weeks was updating the GX to 2.60.

best regards,


martghh asked
needyowlet commented ·

0 Answers

Quattro AC Input Current Limit ignored on Pass Thru

Two Phase ESS setup with 2 x 48/8000/110 Quattros, 15kVA three phase generator with Titan 48/50 Charger on third phase.

Firmware: CCGX 2.53~2, Quattos 469.

Generator on AC-IN-1 with current limit of 14 Amps. All good while loads are low and system in Bulk, charging battery. Current hovers around 12 - 14 Amps. The problem I have is when a large load turns on, the mode changes to "Pass Thru" and excessive current is drawn continuously from the generator. I was monitoring the system when the 3kW water heater came on. I watched the Quattro draw 27 Amps from the generator for 30 seconds before I turned the generator isolator off. This is virtually twice the limit set.

Dynamic Current Limiter - disabled

UPS Function - Enabled

Was going to try the "Dynamic Current Limiter" but the increase in current is not temporary. It matches the loads applied and completely ignores the “AC Input Current Limit”. Also I don’t want it working while connected to the grid.

Please advise if I’ve overlooked something.

mike-lynch asked
Willem van Schalkwyk answered ·

10 Answers

Why connect the Negative DC battery terminal or busbar to Ground?


What is the reason why negative busbar and grounding busbar are common? How can we protect the system against impacts from the soil in this case?


cagataysahinoglu asked

0 Answers

PV throttling very often

I have recently installed an ESS System (Victron Multiplus 48/5000/70) with one BYD 5kWh and Fronius PV Inverter connected on AC out (on-grid system).

ESS is on "Optimized (Without BatteryLife)". The connection between PV Inverter and Victron is wireless.

The system is working ok but I have some issues which for the moment are unsolved.

For example, the PV production is frequently stopped just to return in the next seconds.



As you can see from the graph, PV is having a strange behaviour when charging the batteries, the graph looks like a saw teeth when I was thinking to be like a smooth line. The PV throttles down to 0 frequently as you can see and I do not know the cause of this.

Any ideas?

ccb asked
ccb edited ·

3 Answers

Connect Mastervolt charger to Cerbo GX ?

Is it possible to connect a Mastervolt Chargemaster Plus 24/60 (czone) to a Cerbo GX to read values from the charger within the victron system?

Jimmy Bergetun asked
wkirby answered ·

1 Answer

SOC en dessous du SOC mini

Bonjour à tous

J'ai un problème avec le soc mini de mes batteries Byd qui étant réglé à 20% descend parfois en dessous (18%) et provoque la charge des batteries à partir du réseau. Ce problème intervient surtout en fin de nuit et provoque la coupure du disjoncteur réseau car la charge des batteries (48v 80A limité par DVCC) et mes autres charges sont supérieures au réglages du disjoncteur réseau.

Si je descends DVCC en dessous de 80A, je ne bénéficie pas de la pleine puissance PV en journée pour recharger mes batteries.

Est-ce que l'on peut régler le problème du soc qui descend en dessous du soc mini ou bien est ce que l'on peut interdire la recharge à partir du réseau?

Quattro 48/10000/140 firmware 475

CCGX 2.54

Batteries Byd pro 20Kw (2x(4x2.5))

18 Kwc PV parallèle ACin L1

200/300w en ACout 1



arneze asked
Thierry Cortassa (Victron Energy Staff) commented ·

2 Answers

How to use more than 2 MPPTs with Byd and CCGX on ve direct/usb

Just wanting to put this one out

Colour gx, byd, Bmu 3 smart mppt’s

The colour gx only has 2 ve direct ports so is it safe to say the ve direct to usb lead can be used for the 3rd mppt and not cause any issues?

mikeb asked
Guy Stewart (Victron Community Manager) commented ·

4 Answers

BYD LVL 15.4 - Cell imbalance warning

I have a single phase system with 2 Fronius Primo 6.0-1, 1 Victron quattro 15000 and 1 BYD LVL 15.4 battery. My peek production is limited to 11.5kW.

CCGX is always displaying Cell Imbalance Warning.

Is this a problem to the system or batteries?

Can this be fixed?


João Morais

joao-pedro-morais asked
joao-pedro-morais commented ·

2 Answers

EasySolar-II 48/3000/35-32 MPPT 250/70 GX + BYD B-Box Premium LVS

Dear All,

I wanted to confirm If I can or I cannot connect BYD LVS battery to EasySolar-II GX 3000.

Here in the datsheet it is written that I cannot:

Just wanted to confirm :)

Best regards.

enersol asked
Matthias Lange - DE answered ·

1 Answer

Skylla BYD 48v charging, is it possible?

We have a system with 2 x 5kW Multiplus 2 in ESS. The customer also wants to have generator backup.

The Multiplus won't accept the generator on the NZ4777 grid code(via a changeover switch), so we need another way for it to work.

I'm wondering if we can charge the 48V BYD lithium battery bank via a separate 48v charger.

Has anybody done this?

dean-d asked
Matthias Lange - DE answered ·

3 Answers

Multiplus 2 - 3 Phase Output

Hey everyone

I have a project coming up requiring on grid battery backup, the load is a 3 phase lift and I have read the documentation and watched the training videos and believe 3 x Victron Multiplus II 5000's will get the job done, I wanted to make sure I wasn't missing anything or there's any additional information I should know about Multi's and 3 phase backup.


They are per-phase (415v 3 phase supply.)

-5.5kw per phase
(8.51 amps per phase @ 0.9PF)
(Noting max grid[starting] current is9.82A per phase, which is ~6.4kW @ 0.9PF..)


I have specified

  • 3 x Victron Multiplus !! 5000
  • 2 x BYD B-Box Pro 13
  • 2 x 6KW SMA Tri Powers

Thanks in advance!

ross-skyenergy asked
marekp answered ·

2 Answers

[SOLVED] BYD BBox Pro reading 0% SOC on CCGX but 100% on battery

Hi guys

I have a site that has a Multiplus II and CCGX. AC Coupled with an SMA Sunnyboy 5.0 inverter and BYD BBox Pro 13.8Kwh battery.

Everything was working really well up until about a month ago, the CCGX is reading the battery SOC to be 0% but the mulitplus is showing 55v (or 100% SOC) and the BYD battery is also showing 4 full LEDs so full as well.

I have tried resetting the entire system and it does the same thing.

Has anyone had this issue?





ross-skyenergy asked
ross-skyenergy edited ·

3 Answers

How to clear "System overview - Grid alarm: Grid lost" VRM alarm?

Have the following active alarm in VRM that won't seem to clear: "System overview - Grid alarm: Grid lost" Is there a fix for this? I don't even know how it got there as it is a stand-alone system with a generator?


mike-lynch asked
torgnysaker commented ·

2 Answers

Quattro battery charging voltages not observed with BYD battery when DVCC is enabled?


All firmware for 3 Phase 5 KVA quattro , Venus and charge controllers , fronius are latest with BYD 10 KWH pro batteries - system VRM ID is TapetaMain

While troubleshooting my random switch offs I observed the following behaviour

The Battery sits steady at 55.5V and occasionally jumps to 55.6/55.7 volts at fill SOC Despite the Quattro settings of 55.0 as float and 55.2 as absorb

Both DVCC is on and the solar charge controllers show Remote control active .

See screenshots

has something changed in DVCC alhorithm ? I suspect my issues are linked to BYD switchiing off in Overvolatge when large load swings happend such washing machine or dryer happen .





Anil Ghatikar asked
Daniël Boekel (Victron Energy Staff) commented ·

2 Answers

Under voltage alarm on only Quattro not on BYD


I had multiple Undervoltage alarms/warnings on L1 Quattro in 3 phase setup out of sudden.

The LOG file shows BYD reporting normal 54.7 V voltage There was a normal load on the system and no overload recorded. The alarms were getting triggered randomly and the log shows wildly fluctuating VE bus voltage

Does the Ve bus take the voltage only from L1 Quattro?

I checked cable tightness in Quattro ( all three phases ) as well as on the LYNX busbar.

Will check later today the breakers and the individual battery module tightness. What else should I check? The system worked for the last 1 year without any major issues.

The system is ONgrid /ESS with 10 KWH BYD pro and 3 ph 5 KVA Quattro with 6 KVA Fronius and 250/70 Smartsolar

The Log is attached - Relevant entries around 10.30 AM are marked in yellow battery alarm

Anil Ghatikar asked
byd-service commented ·

7 Answers

AC Coupling and BYD premium LVL 15.4


I would like to know if there is any possible way to speed up frequency regulation by modifying the settings of the PV inverter assistant.

The system is off grid and consists of

- BYD LVL premium 15.4

- Bluesolar MPPT 150/60

- Quattro 48/8000

- Solaredge SE6000H (maximum expected PV-contribution is << 4500W)

The P(f) ramp at the Solaredge side is defined from 50.2Hz to 51.7Hz and disconnect @ 52Hz.

The Victron PV-Inverter assistant is configured for the same band with disconnect @ 52.1Hz. With 6000W inverter and 6400W PV.

I observe that once 55.2V are reached BYD sets the charging parameter to zero. However charging continues as the frequency ramp only rises slowly and therefore the SE inverter does not reduce its output fast enough. For now I throw off (via AC-OUT 2) the SE inverter once the voltage gets higher 57V. By that time frequency has only risen to 50.4Hz. Can the ramp rise time be shortened? Am I too carefull with the 57V limit? (cell details show almost 3.8V for the highest cell). Thank you in advance for your help and input!!

iertigre asked
iertigre commented ·

1 Answer

BYD B-Plus module without BMU?

Hi! Here's my doubt about the BYD BMU...

I'd like to use 1 or 2 B-Plus modules of my BYD B-Box Pro 7.5 system in another application, but I only have 1 BMU (the one that comes with the case). Is the use of a BMU mandatory, even if only 1 B-Pus module is used?

Can it be replaced by a shunt (ex. BMV 700 + shunt) or another BMS technology, like the VE.Bus BMS?

Thanks in advance!

icrea asked
icrea commented ·

1 Answer

Are there any system schematic drawings of a three-phase installation using the premium LVL BYD battery and three Quattro 48/5000/70

Kindly share a system schematic drawings for a three-phase installation using the premium LVL BYD battery and three Quattro 48/5000/70.

Abraham Munene asked
petje137 answered ·

1 Answer

Can I add a second BYD LVL 15.4 battery later as the load demand grows?

Can I introduce a second BYD LVL 15.4 battery later as the load demand grows? Do the problem of combining old and new batteries apply to the BYD premium range of batteries?

Abraham Munene asked

0 Answers

Discharging BYD LVL when sun is shining

Hi together!

I've installed a set of 6 Multiplus 3000 (two on each phase) with LVL 15,4 a few days ago.
Yesterday, when i checked the charts i got a "suprise". Our house uses 7kwh over night from battery, but over the day the LVL gets a charge of 20kwh.
Today I can see why. After the LVL reaches 100% it doesn't stop charging but switches between discharging and charging. All day long... Right now i've got over 9000watts of solar energy but LVL is discharging.
Seems as BYD BMU is faulty? My colleague has the same setup and exact the same "problem"

Anyone here with the same strange thing?


n-dee asked
Guy Stewart (Victron Community Manager) commented ·

0 Answers

Using MPPT Smart Solar 250/100 and MultiPlus 48/5000/70-100 with BYD Batteries without the ESS assistant


I have an installation with:

- MPPT Smart Solar 250/100 - 1pcs

-MultiPlus 48/5000/70-100 - 1pcs

-Venus GX.

-BYD B-Box 2.5 - 2pcs

Now it works with ESS assistant, but I want to delete this assistant, would it system work without it?

How solar charge controller will be limit output charge power?

Thanks for yor answers!

viktor asked
Daniël Boekel (Victron Energy Staff) commented ·

1 Answer

Netz 0 Stellung

Hallo Zusammen,

ich bin jetzt von einer Kostal Anlage auf Victron gegangen. Der Beweggrund hierfür ist die Flexibilität der Nachrüstung und die Notstrom Funktion.

Folgendes Setup:

6x Multiplus 2, 2x BYD LVL Batterie, Cerbo GX, 1x MPPT 100A, 3 x MPPT 85A und 16,4 Kwp PV.

Problem 1:

Ich beziehe einen Teil vom Netz, obwohl der Speicher voll ist und die Einstellung Sollwert Netz auf 0 eingestellt ist.



Problem 2:

Ich beziehe in der Nacht etwa 4-5 Kwh vom BYD LVL Speicher, tagsüber werden dann aber 15-16 Kwh geladen. Das kann ich täglich beobachten.

Updates sind alle gemacht und aktuell.



Kann mir da wer Tipps geben wie ich das Lösen kann.


Beste Grüße


Alexander Aichhorn asked
n-dee answered ·

1 Answer

Li-Ion battery bank for PV AC Coupled

Dear All,

I have a grid-connected installation where there is about 10kWp of PV.

I wonder what size Li-Ion battery bank should I use.

According to Victron blog:

I should use:

100Ah 48V bank for each 1,5kWp.

which means about

670Ah 48V battery bank.

Calculating that to kWh it is about 32kWh battery bank.

Then I should use 9x3,84kWh BYD LVS modules.

Is my calculation okay?


Why cannot I use less capacity, for example, 20kWh (it allows me to charge my batteries with max 0,5C)?

What other criteria are taken in recommendations to give such huge battery banks?

techsol asked
techsol commented ·

1 Answer

HRC NH Fuse Types

Hi - Seen NH fuses used in many Vitron or Web Images and referenced in training videos, and propose to use the same. Noticed there are differing types of NH Fuse, and wanted to know which is best to use between BYD LVL and Main Busbar (which goes onward to Quattro /MPPT/GX). Types I've seen are:

- gG for cable and line protection

- aM for the short-circuit protection of switching devices in motor circuits

- gR or aR for the protection of power semiconductors

- gS: The new gS operational class combines cable and line protection with semiconductor protection.

Any recommendations on which is most appropriate? gS or does gG suffice?


ogrt asked
jbakuwel answered ·

1 Answer

Experience of BYD Batteries together with Victron Venus/MPPT/Inverters


Anyone with experience of using BYD batteries with Victron equipment, I'd love to hear your comments.



jasontav asked
Gabriel Tanasescu commented ·

1 Answer

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