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Why would my System go off when plugging in the VE.Can or VE.Bus?

Hello, I am using a Victron set up with BYD batteries. I have a ccgx with Quattro 48V|8000va|110amp. I have 2 BYD Boxes with a total of 20kW. The system had been working great since early 2020 and recently it started shutting off randomly with now errors recorded. So I read on the forums that some had issues when the VE.Bus going to the inverter would shut the system down when plugged in. So, when I could not get the inverter to turn on at all even with a reset I unplugged the VE.Bus network cable and it turned right on. I live in Zambia so I did trouble shooting with my supplier from South Africa over WhatsApp. We went through many different scenarios. We unplugged everything from the back of the ccgx and left the power cable connected and shut off the supply of power from the solar arrays. With the VE.Bus plugged in and connected to the inverter the system now came on. When I plugged in the VE.Can going to the BMS for the BYD the system again shut down. I connected everything back and whenever the VE.Bus and VE.can were both plugged it would go off. But if one or the other were unplugged it would run. I tested the network cable from the VE.Can to the BMS and it seemed to be okay. I swapped BMS's as both BYD boxes come with one and so I had a spare and it did the same, shut off. I tried with just 4 of the eight batteries and set the fuse addresses to the correct setting and it still shut off. I tried with just one battery and it still shut off. At the end of the day before the sun went down I connected everything back together and surprisingly it worked perfectly fine with VE.Can and VE.Bus plugged in to the BMS and Inverter. Now it has been 2 days and it is working fine. I just want to see if anyone may know what was causing my problem in case it starts happening again.

jessekrenz asked
Guy Stewart (Victron Community Manager) commented ·

1 Answer

BYD B-BoxPro, BlueSolar 150/85VE.CAN, and SmartSolar150/85

Good day,

We have an existing system with 3 MultiPlus 48/5000/70 (in parallel), 4 BlueSolar 150/85 VE.CAN, 2-BYD B-Box Pro 10 kWh, 1-BYD B-Box Pro 7.5kWh, and a Color Control GX.

One of the 4 BlueSolar had a 0 current reading, so we requested for a replacement. Since, BlueSolars are not anymore available in the market, they sent us a SmartSolar 150/85 as a replacement unit.

1.) How can we synchronize the SmartSolar to the existing 3 BlueSolars and what will be its connection to the CCGX? What are the needed accessories and upgrade to sync the charge controllers if it is possible?

2.) Can the BYD BMS communicate with the BlueSolar 150/85 VE.CAN?

Thank you.

harry-chavez asked
Guy Stewart (Victron Community Manager) commented ·

3 Answers

Can I mix BYD Pro 13.8 and BYD Pro 10.0

I have 4 BYD Pro 13.8's in a system and a spare BYD Pro 10.0 which i would like to add, anyone got any ideas?

David Gould asked
byd-service answered ·

1 Answer

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
pipahaha commented ·

0 Answers

BYD Battery-Box Premium LVL 15.4 showing 325Ah instead of 300Ah on CCGX


I have few problems with my ESS system and BYD Premium LVL.

1. Capacity reported on CCGX (v.26.3) is much greater than 300Ah (see attached photo)


2. I am no longer able to upgrade the battery box and BMU firmware using the latest BE Connect application (v1.7.1). I am able to connect to the battery wlan, after downloading the firmware in my android phone, but the BMU is busy asking to try again later.

Please help!



mihair asked
mihair edited ·

1 Answer

3 Phase Skylla VE BUS Control

Hi Victron enthusiasts, after consulting the manual for the Skylla TG 3 phase I can't seem to find any clear information relating to its ability to connect to the VE BUS and respond to a CAN battery (BYD LVS)'s charge current requirements. As far as I can see they only have an allow to charge yes or no control? We are wanting to use the 3 phase Skylla for charging as we have a 3 phase genset for backup but only require to run single phase loads off of the Multiplus.

Has anyone done this before? Is there a better way to do it?


jakefrpc asked

0 Answers

BYD battery not charged by the Quattro - output frequency 52,7 Hz



I have recently purchased a BYD LVS 20.0 battery and a Quattro 48/8000

My system is off-grid and has a Quattro 48/8000 with a FRONIUS PRIMO 3.0 on AC out, an MPPT 150/70 and a CCGX .

All setting are done according to your guidelines :

Victron & BYD [Victron Energy]

Here is the problem :

After the battery is fully charged TO 100% (around 13:00-14:00) the battery starts to discharge although there is plenty of sun to keep it charged. The MPPT keeps giving power but the Quattro shuts down the FRONIUS to 0W!!!

I can understand this happening if the battery voltage is above 55 V but this goes on even if the battery voltage goes down to 53V.

I am positive that this is not a BYD BMS issue. I tried connecting the AC GRID that I have as a back up and then the quattro started charging the battery as well immediately because it dropped the frequency back down.

I believe that the quattro should keep the fronius awake as long as the voltage is 55V or lower. Even if it has the frequency locked probably because of an overcharge insident (no error appeared) it should unlock after the voltage drops under the rebulk value. This value is 54.2V for my system but the frequency is still locked even reaching 53 V.

Why does it not unlock the frequency?

I am loosing power and the battery starts to discharge from 14:00 for no reason.

Vangelis Beligiannis asked
Vangelis Beligiannis commented ·

4 Answers

AC LOADS readings jumping up and down like CRAZY on Fronius AC coupled when frequency above 50.2V

My system is off-grid and has a Quattro 48/8000 with a FRONIUS PRIMO 3.0 on AC out, an MPPT 150/70 and a CCGX .

When battery is in float (55V) and the Fronius (on AC OUT) is regulated be the frequency (above 50.2Hz) the AC loads readings on the CCGX go crazy! Up and down by hundreds and even thousand Watts.

As soon as the frequency drops to 50 all is back to normal.

Any ideas?

Vangelis Beligiannis asked
Vangelis Beligiannis commented ·

2 Answers

AC coupling BYD Battery-box Pro13.8, with microinverter and 4 inverter Quattro 48/5000/70


We have a PV system with 4 inverter Quattro 48/500/70 and 2 battery-box Pro 13.8.

Righ now we are only going to expand the photovoltaic system to 10.9kW, but the AC- coupling manual indicates ""Each additional 1.5 kWp of AC PV will require an additional proportional 4.8 kWh increase in battery storage""


10.9kW (AC PV) / 1.5 kWp x 4.8kWh = 34.88kWh

but, I have 27.6kWh (Battery)

Can I expand the System without more batteries?

or I have to add more?

rosimar-diaz asked
Vangelis Beligiannis answered ·

1 Answer

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

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

  • MultiPlus-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 > currently returned to 60W again
  • 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 3.02) 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) > currently tested with 2.62-beta5
  • Any component with latest firmware as of today


thomasw-1 asked
thomasw-1 answered ·

5 Answers

Error 17 master failure when Grid fails aka Loadshedding.

We have a Few Installations that have 2 or more multiplus II's where we have the system work perfectly until the grid fails, at this point we get error 17 master failure.

We Have victrons rj45 cables cables between the Multipluses and colour control. They have been checked.

The wiring is all the same length.

We have updated the firmware to latest.

The fuses are fine.

The colour control has been replaced at one site, but it still happened.

Is there any other advise?

This has happened at multiple sites now with multipluses in parallel.


dylan asked
Hannes van Staden edited ·

4 Answers

BYD B-Box Pro 7.5 unable to start.

Last year (Nov 11 2020) I posted a question regarding my BYD B_Box that within 2-3 days SOC dropped from 90% to 7%. I got an answer from Guy Stewart that said:

This model of batteries have an issue where they are not very good at measuring very low power demand, anything less than 50W ~1A per module is not very reliable.

This is not normally an issue if the battery is recharging to 100% - 55.1+ V. At that voltage, it will recalibrate the SOC reading.

It seems like something has changed in that time that meant the battery was no longer reaching that 'recalibration' voltage threshold.

I can only speculate why that might be the case, but that is surely the explanation for inexplicable SOC drop

So I shut down the inverter (remotely) and only left the charger and the CCGX on and since this is an off-grid system up in the mountains in Norway I haven't been able to visit before now.

When I arrived yesterday the batteries was totally "dead" the solar charger MPPT 250/60 said that it was not charging due to lost connection to the BSM and the CCGX did not list the BYD box at all.

The BYD BSM module have a blinking green led that blinks two times and then have a pause. According to the manual this means lost connection to the batteries - no surprise since they don't turn on.

Then the question - Is the batteries totally dead or is there a way I can get the batteries back to life? Like trying to charge each battery individually by bypassing the BSM or telling the MMPT to ignore the BYD "BSM"....?

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 Johansen

Sveinung L. Johansen asked
byd-service commented ·

1 Answer


On the VICTRON SMARTSOLAR MPPT 250/70-MC4, the blue light next to "Bulk" flashes slowly.

In the Ve connect app, PV Solar shows 0.00. But measured, from the solar panels come in 156V, which is not stored in the battery.

On the CCGX, the MPPT state is off.

What could be the reason why MPPT doesn't turn on?

sunpowerlv asked
sunpowerlv commented ·

2 Answers

Byd box pro battery issue with SMA inverters

Hi everyone, I have a b box pro 13.8 with a sunny island 8 and 2 sma 5 inverters, all only 1 year old, system was running really well when we moved into our new house, generator came on a couple of times when battery hit 30%, and to took about 2 hours to fully charge, but for the last month the Genny has been coming on roughly 4_6 times per 24 hours, only running for 20 minutes and sunny portal shows the battery is fully charged??? We are only drawing roughly 300wh in the evenings so the battery should last time until the morning, anyone else had issues similar?

garychasney asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

3x quattro 48/8000 et BYD LVL15.4

i've got a installation off grid in 3 phase with 3 quattro 48/8000, 2 Fronius Symo 8 and 1 BYD LVL 15.4. the batterie went to 0% (bad weather for 3 days). after that, my customer started the generator (ACin) and put the 3 quattro on charge only. the voltage of the batterie went from 0V to 42V in nearly 3 hours. but i still got on the color control 0% of charge? is that normal? and the batterie don't stay on (the led stopped after 3-4 minutes). my customer had to go away so stopped the generator to save the petrol (the site is on a remote island). so my question is how long should the generator goes on to charge the batterie to be able to put the vitron ON and get the Fronius inverter working?

hope i'm clear enough as english is not my usual language.


pat-muet-esnc asked
ruben commented ·

1 Answer

3-Phase MultiPlus II ESS System with an additional MultiPlus II for battery charging

Dear Victron Fellows,

I have the following use case for two almost identical installations:

On the already existing 3-Phase ESS installation using MultiPlus II Devices, the battery should be charged in case of a grid failure and in time of insufficient PV power.

The installation already has the following devices:

  • 3-Phase ESS installation using 3 MultiPlus II 48/3000 operating in parallel to the public grid (230V)
  • 3-Phase Fronius AC PV converter connected at the critical loads AC Output of the Multis and controlled by frequency shifting (MG50)
  • CCGX
  • BYD B-Box 10.0 connected by VE.CAN to the CCGX
  • MPPT Solar Charger connected by to the CCGX

A single phase 5kVA 230V Diesel inverter is available. It should be used to provide the power for the charger.

Is it possible to charge the battery using an additional MultiPlus II connected to the CCGX?

Can the Multi be connected to the CCGX and does it receive the relevant battery information BYD BMS information (DVCC)?

According to the following question it should be possible. And that is what I would expect and I think is the reason of DVCC.

Asking my dealer to verify the answer he told me that it is not be possible to connect the additional Multi to the existing CCGX, because the additional multi would need its own controller and needs to operate independent from the ESS system.

He suggested to connect the Multi by the relays (LINK). This would not be an preferred option for me because I would expect the charging process to be more optimal if it is controlled by the batteries BMS.

If the additional Multi can not be connected to the CCGX, would it be possible to add another Venus device and connect the CAN Bus to this device for retrieving the BMS information?

Best regards,


martin-m asked
martin-m commented ·

3 Answers

BYD LVL and old model BlueSolar VE.Can compatibility

Good day, all! We need help on this.

We have an existing system that uses Victron BlueSolar Charger MPPT 150/85 VE.Can, Victron MultiPlus 48/5000/70-50, Color Control GX and lead-acid AGM battery. We are now going to replace the battery with BYD Premium LVL 15.4.

Is this possible with the existing system? What should also be the configuration of the charge controller and the MultiPlus?

Thank you!

jan-brix-castillo asked
Guy Stewart (Victron Community Manager) commented ·

1 Answer

BYD BBox Pro 10 KWH not seen on VRM- system working normal


I have a BYD pro 10 KWH with 3 Quattro 5 KW system. The system was working fine till it was switched off to remove the faulty Smart solar.

After restarting the system the BYD pro is not shown in Venus /VRM

@BYD_service Interestingly the run light on BMU is constantly on - also the 4 units of B-Plus have steady lights - The battery does not switch off and remains on till manually swicthed off

I still did the following to see if it will solve the problem but no improvement

1, changed the addressing of batteries instead of 1-234, made it 4-3-2-1

2. Removed and reseated all cables after cleaning with contact cleaner

3. replaced the BMU to CCGX cable (self-made) with another cable (self-made) It confirms to Type A pinout

4. updated CCGX to the latest release candidate

5. Switched off battery completely waited 10-15 minutes ( no lights on on BMU and B-Plus) and restarted the battery

6. The battery accepts the charge or discharge if I switch on the Quattros

7. In the coming days I will change to official TYPE A cabel to be sure

short of trying a different BMU or CCGX is there any other option i can try?

It will 1-2 weeks before I can get another BMU . Can I run the system using Allowed to charge and allowed to discharged contacts in normal mode after switching off ESS. Since my 250./20 Smart solar also requires repair /replacement the loads will be mainly supplied by grid or generator

Anil Ghatikar asked
Guy Stewart (Victron Community Manager) commented ·

1 Answer

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
ruben answered ·

1 Answer

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

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 L. Johansen asked
Sveinung L. Johansen 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

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

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

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