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BYD Premium LVL 15.4 - weird approaching to 100% SOC while charging

Hi (and a happy new year, of course),

running 2 of the BYD Premium LVL 15.4 in a 3P config with MultiPlus II 5000 shows weird characteristics while approaching the 100% SOC - after updating to the latest BYD battery firmware levels. While charging (with relatively low current 10-20A) below 100% SOC all looks fine (max Voltage (CVL) 58.4V max Charge Limit (CCL) 468A) - once running at 99% for a while - so shortly before reaching the 100% - the max charge voltage (CVL) abruptly dropped to 56.9V (CCL to 0A) and the Inverters start to discharge with >160A for about 10-20 sec before start charging (low charge current) again. This hasn't been observed with previous BYD firmware levels and the same levels on the MPII and Venus. This happens now during all charging cycles reaching 100%, no exception. Is there any mitigation/workaround going back to a smooth approaching the 100% SOC ? Looking more at the nasty details i also saw that charging (~5A) continous at 100% SOC level while the BYD BMU reports a max charge (CCL) of 0A, the voltage is still below CVL - is that Ok ? Is the voltage level the important one and the mac current (CCL) could be ignored ? just to be sure the batteries staying healthy ;-)

best regards,


martghh asked
martghh commented ·

1 Answer

BYD BMU - Access via the Ethernet Port

Hi All,

Just wondering if anyone knows the username and password to Access BYD's LV BMU Premium via the Ethernet port rather than WiFi?

As standard you configure the BMU via an app or software and connect to the BMU via WiFi. The WiFi ID and password are printed on a sticker on the side of the BMU.

However it seems after some period of operation of the battery the WiFi in the BMU shuts down so you can't reconnect with it at a later date to diagnose issues or extract data. The only way to reconnect via WiFi is to shut down the battery and power it back up again - thus the WiFi then reappears. I assume this is for security purposes which makes sense however it is a pain to have to reset the system just to reconnect.

I was able to determine the MAC address of the Ethernet Port of the BMU and assign it a fixed IP address in my DHCP server. However when I try and access the IP address via explorer/Chrome/etc. the website asks for a username and password however I have tried everything I can think of and I can't get in ("WiFi ID"/BYDB-Box, Installer/BYDB-Box, admin/BYDB-Box, BYD/BYD, BYD/BYDB-Box,.....).

Just wondering if anyone knows what the default username and password is to access the BMU via Ethernet on the local network?

Or am I doing something wrong?

Kind regards,

Tristan Bayly


tabrocky asked
tabrocky answered ·

2 Answers

BYD LV Flex - Incorrect Installed Ah Capacity

Hi All,

I've just installed 6 of BYD's new LV Flex 5.0 Battery Modules onto an existing Victron ESS system with CCGX, Multiplus-II 5000VA and a couple of SmartSolar regulators. All is working well however the BYD BMU is reporting an Ah Capacity 3 times higher than what it should be - reporting 1800Ah available instead of the 600Ah it actually should be. This is resulting in the SoC reading being way off the mark. Thankfully the system has a BMV which I've configured to match the new batteries and I noticed the large SoC discrepancy between the BMV and BMU during commissioning before potentially fully exhausting the new batteries unknowingly - BMU would currently theoretically show 66% SoC when the batteries are fully depleted.

Going online with the BMU I can see the Victron system is only reporting what the BMU is telling it so I'm quite sure the issue is not on the Victron side and is in the BMU. All Victron devices have been updated to the latest firmware revision.

When commissioning the BYD system I was unable to use the BeConnect 2.0 android app as it kept crashing on my device (Andriod v6.0.1). I had to resort to using the BeConnect Plus v1.6.1 software for windows and was able to connect to the BMU and update the firmware to the latest version or so I believe as there doesn't seem to be a way to look up on the BYD website what the latest firmware version actually is - only what the software tells you it is.

I also updated the parameter table after a couple of attempts. The software did seem a bit flakey and every now and then when doing a refresh would show completely garbage information (see last screen shot).

Looking at a previous post on a similar topic it seemed the issue was identified to be with the parameter table in the BMU. This makes sense however the software is telling me I have the latest version of the parameter table (V0.11) so I'm at a loss as to what to do.

I've sent an email to the guys at Alps power here in Australia requesting some support particularly given this is such a new product and I don't imagine there is probably a large installation of these new batteries yet. Not sure if this is a bug or if the BCP software has issues updating the BMU correctly for this new battery?

Either way I though I'd put it to the community to see if anyone has any thoughts or can provide any guidance on what the issue might be?

Not sure if @Guy Stewart (Victron Community Manager) may be able to help given your involvement in the BYD Webinar Launching the LV Flex with Victron and associated setup.

Even to compare the BMU/BMS/P-T versions to see if I am actually running the latest or if the software is telling me fibs.

Kind regards,





tabrocky asked
tabrocky answered ·

2 Answers

BYD LVL 15.4 - High Battery Voltage Warning


since 2 days i've connected new BYD LVL 15.4 (two units) to a single MP-II 48/5000 together with 2 MPPTs chargers. Installation and configuration went smootly, following the Victron provided docs. All components running the lastest SW and no connection problems exists. Since the initial full charge i saw Voltage Warnings from the BMU (and on the CCGX following) - the Battery voltage is displayed at 55.3V and thus slightly above the documented limit. I though that CCGX (venus) is dynamically controlling the DC voltage receiving the changing limits from the BMU ? Any other option to correct in order to avoid these warnings ?

best regards,


martghh asked
Guy Stewart (Victron Community Manager) commented ·

1 Answer

Battery voltage limit

We have a couple of Multiplus v2 5k, a 5k AC coupled Fronius, 4 BYD b-box LV 48v batteries and a Cerbo to tie it all together.

Now I want to limit the charging voltage on the BYD batteries from 58.4 volt to 56.4 volt. According to Will Prowse this will greatly increase battery lifetime. Please correct me if I'm wrong.

I have no idea how to do this. In Venus OS, the CVL option under the BYD parameters is not changeable. Do I need to do this in the BYD software somehow?

Thanks in advance,


yagu asked
yagu answered ·

2 Answers

Dual Victron inverter (15kW Quattro & 5 kW Multiplus) for on an off grid system with four BYD 15.4 LVL batteries, same battery bank, separate AC out

Dear Experts

I am trying to build an off grid system for Broadcast Critical infrastructure. The issue with standard installation approach is that it requires inverters to be daisy chain (like Master & Slave). In an event of Master inverter failure the AC output of slave inverter would also stop. I have experimented connecting 5 kW Multiplus through the USB port on cerbo GX via MK3 but that approach disconnects the Multiplus inverter from BYD BMS. So in case of battery internal fault Multiplus won't shutdown. Can you please suggest a way in which both inverters could operate independently with BYD LFP batteries without compromising the integrity of the overall system. The reason I want to operate inverters independently so that there is diverse power supply for the FM transmitters.

daniyalshah asked
Alexandra answered ·

1 Answer

BYD B-Box Pro Charge Current Limit and Temp

Hi, The BMS is reducing the charge current when the battery temp is still above the 15 deg threshold. Currently reporting battery temp at 16 deg so charge current shouldn't be limited but it looks to of limited the charge current at the point when the battery temp dropped from 17 to 16 deg. Any ideas why this is happening?




nigel asked
nigel answered ·

2 Answers

Can I Connect a new BYD LVS to "old" BYD B-Box 2.5 ??


I am building a new home and need to upgrade my solar system.

Current situation: Victron EasySolar 48/5000/70-100 MPPT 150/100 Color Control
B-Box batteries (3x2.5 kwh) in cabinet
4x 320Wp LG NEO panels

I can extend my mppt with two more sets of 4 panels S/P connected, i got that covered, but.....

In the cabinet is space for one more 2.5KWh BYD battery, but they are very hard to get. Now i wonder , is it possible, and does Victron support, connecting 1, or more batteries from the new LVS series? (I know you could connect two or more "old" BYD cabinets and have 10/20/30 ..... KWh).

My batteries are 2.5 (x3) so i have 7.5 KWh now.
I see the LVS are 3.84 KWh.

Thanks and regards,

marcel-solar-spain asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

Adding Victron to existing grid-tied Gen24 + BYD HVS system

I have an existing grid-tied system with a 7kW of panels to a Primo 6kWh Gen24 with 7.7kW of BYD HVS hooked up.

I would like to add a 48V Victron to the system and add batteries, probably Pylontech, and I will be adding a wind turbine to this system, but not initially. What would be the best setup to not mess with my current setup too much, but such that I can fill the Pylontech batteries from both the grid and the panels?

travellinground asked
marekp answered ·

1 Answer

BYD B-Box Pro 10.0 do not appear in CCGX and shut down after a while

I have an existing Off-Grid-system:

MPPT 150/45 (updated) -->
MPPT 150/70 (updated) -->
BMV 700 --> USB
Multiplus 48/5000/70 (updated to V460)--> VE.Bus
ColorControl GX

I changed the batteries to a new BYD B-Box Pro 10.0
All necessary parameters I programmed before changing the batteries.

After starting the BYD-Box the CCGX starts but all devices appear except the B-Box Pro. Because of that the batteries shut down after a while caused by no data connection.

The cable is OK.

What is missing to get appearance of the BYD- Battery Box ?

Andreas Abitz asked
byd-service commented ·

3 Answers

BYD LVL 15.4 with Quattro 48/10000 : High tension detected & SOC erratic

Hi Everyone,

Sorry for the quality of my english.

For our horse school, we have 3x Quattro 10000 / 1 SMA 25.000 and 2x BYD LVL 15.4 (Normally should be 3, but we limit the Quattro to keep the DC flow below the limit fot 2 BYD).

During one year, the same installation was running with only 1 BYD with no issue. Yes only one (we have limited the SMA to 18 Kw to have a charge current below the capacity of the BYD battery (even I think the CGX use an algorithm to increase the frequency to keep the charge current below the limit authorized by the BYD BMU.

Since few days, we have the 2 BYD connected (The second one was connected with the same SOC than the other one).

I have 2 small issues :

1) When the charge is reached 85 %, the CGX show 85/95 % (alternatively) in the Quattro page but in the BYD page, the state of charge showing is 85 %.

2) At 99 % of SOC, I can receive a "high level tension alarm" in the CGX. This kind of alarm never appear with one BYD LVL running. The number of alarm decrease every day. Should be in relation with some cells ?

All firmware are up to date (BYD, CGX, 3 x Quattro and SMA).

Have a nice evening everybody !

Best regards from Mallorca,


elbarjo asked
Vangelis Beligiannis answered ·

3 Answers

Problems with Quattro + BYD + Cerbo

Good morning everyone,

a client of mine is having problems installing a system with BYD LVS 16kWh battery, a Quattro 48/5000 and Cerbo with his touchscreen.
The plant is only powered by a diesel generator since solar panels at the moment are not allowed there. Using remote VE.Configure I enabled the use of a generator without assistant (or do I need it since he's using the Quattro relay?)

I managed to get the plant online but the batteries do not shown under the device list.
I think the problem might be in the Type-A cable connecting the BYD BMU to the Cerbo since the client wanted to make one using the CANH/CANL configuration... I wasn't able to convince him but I do believe this is the problem.

Is it possible that a non industrial cable is causing issues? The guy is not a newbie, he knows how to make one but honestly I got no idea what else it could be.
Just to clarify because maybe I am wrong:

CAN-BUS type-A ==> Cerbo-BYD BMU
RJ485 ==> BMU-PDU
VE.Bus ==> Quattro-Cerbo

I don't think there is more to do but hoping for your help!

Thanks in advanced,


fgs-energie asked
fgs-energie commented ·

2 Answers

BYD premium LVS and Victron multiplus ESS questions

I don't understand a few things.
This is a test setup and only a switch is connected as a load.

1. I see that I supply back to the grid, but why does it say 0.0 kWh to grid?


2. I have a BYD premium lvs 12.0, which is charged to 100% daily.
Every morning the battery is at 96% with a constant load of 5W + the self-consumption of the Victron Multiplus.
Every day 2.0 kWh is charged to get the battery back to 100%.
How is it possible that the battery loses 2 kWh per day with a constant 5 watt load ?

kallenr asked
kallenr edited ·

2 Answers

BYD internal error and low battery alarm.


I installed a Multiplus-II 48/5000/70-50 with a unit of 4kW BYD battery. The system worked for 6 days without any issue. Then the system started triggering' Ground relay test failed ' . Then that error completely disappeared and the system started triggering internal error and low battery alarm. I have rechecked the wiring and the system several times, But I have not found any mistakes within my settings.

NOTE: I have installed several Victron and BYD systems, and this is the first time I am encountering such issue.

Thanks for helping.

dashti asked
Alexandra edited ·

1 Answer

BYD LVS High voltage warning on Remote console

I have an offgrid system with a Quatrro 48/8000, MPPT 150/70 and Fronius Primo 5.0 on the AC output.

Charging parameters for the Quattro and the MPPT are entered as the victon-byd instructions demand.

The strange thing is that I receive High Voltage warnings from the BYD BMS on my Remote console. Why is this happening? The BMS is only responsible for the charge algorithm so why does it create warnings for High voltage?


Vangelis Beligiannis asked
Vangelis Beligiannis commented ·

2 Answers

BYD LVS in cold weather

I have a project where the customer is very interested in using a BYD LVS battery. The project is for a summer cottage and will only be used in the summer so there is no need for high performance during cold weather.

But, as I understood the BYD battiers shuts down below -10deg

This is no problem, but my question is, does the shut down generate any error that needs to be reset manually or does it function normally when the temperature is within limits again ?

The system will be made of Multiplus and a Color control GX (or a Cerbo GX)

Tomas Hansson asked

0 Answers

BYD shows wrong Installed Capacity


I have a installation with two LVS modules, and it shows up wrong the GX world, and of course displays a wrong SoC.

Skærmbillede 2021-08-11 kl. 21.41.05.png

Also for some reason it jumps up and down in the available capacity after the multiples has shut down.

The picture is taken after the battery has been depleted and shut down eg 0% SoC.

Something wrong with the BMU?

philipr asked
philipr answered ·

1 Answer

Can the Inverter RS be used with BMS-managed batteries

Is it OK to use the Inverter RS plus a GX interface with BMS-managed batteries like BYD?

alkyra asked
Alexandra edited ·

1 Answer

How to select the correct Battery System in ESS Assistant for BYD BMU LVL 15.4

I'm in the process of setting up a 3-phase system utilising 3 x Quattro 15kVA, Cerbo GX with touch 50 GX interface. The batteries used are 4 x BYD LVL 15.4 modules. The BMU connects to the BMS Can interface connection, using the Type A Cat5 cable, with a termination plug.

I'm at the point of setting up the ESS Assistant within VE Configure 3 where asked to specify the Battery System.


The two options as I see it are the with two-signal or "with other type BMS".

Where in Victron literature can an answer be found, as the technical data on the LVL is scant.

battery-boy asked
battery-boy answered ·

2 Answers

Quattro 48/3000 and BYD LVL 15.4. Are they compatible?

Hello everybody,

I have two Quattros 48/3000 connected in parallel, single phase.

In the Victron Compatibility page it says the following: "All 48V Multis, MultiPlusses, MultiGrids and Quattros are compatible".

...but then there's this table:


As you can see, the Quattro 48/3000 is not mentioned.

It's the same inside the document "Minimum Configuration List" made available by BYD, see below:

[image] I missing something? Is the 48/3000 compatible with the BYD LVL 15.4?

Thank you for your help

niccolaiddis asked
niccolaiddis answered ·

3 Answers

BYD LVL 15.4 High Battery Voltage Warning


I've got an off grid setup with 3 quattro 48/15000, 2 SMA Tripower 25000TL and 5 modules of BYD LVL 15.4. Installation and configuration went through no hitches, all unit firmware was updated. CCGX usually reports high battery voltage even at 54.9v. Any ideas as to how to resolve this?



obinna15558 asked
Alexandra answered ·

1 Answer

batt Capacity added - ESS reconfigure needed


I have a question about the ESS config.

At this moment I have 2 Victrons multiplus-2. They are managed bij Victron cerbo.

The battery is based on BYD Premium LVS 4.0.

For the configuration, I follow the Victron BYD documentation (

When I started with this setup, I had only one battery unit. So, the batt capacity was set 78Ah within the ESS config.

Later on, I added a batt module to increase the capacity. But I didn’t update the ESS config with VEConfig utility.

The Cerbo reports that 2 batt modules are installed. And the total capacity is correct.

Is it really necessary to change de ESS config? This gives a downtime.

The batt is charged with MTTP that also managed by Cerbo.


Config ESS -> one batt module


current config with 2 batt modules


theklaas asked
theklaas answered ·

2 Answers

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
mr-g answered ·

6 Answers

BYD LVL Sudden Voltage drop to 37V

Hi everyone,

I have a system Quattro 10K with a BYD LVL 15.4kwh. The battey voltage drops suddenly from 53V to 37V. Does anyone has an idea on where the problem is. I am out of troubleshouting ressources.



Kofi asked
Kofi answered ·

2 Answers

Where is the Temperature sensor mounted - in the Easy Solar 48v box, or in my BYD lithium battery box?

Where is the temperature sensor mounted for my Easy Solar 48v system? Or is it mounted inside my BYD Lithium battery box? My problem is in the winter, when the shed temperature is lower than 15 deg C and I'm running the generator, then the sun comes over the hill, and my solar panels' charging capacity is throttled back, due to the low temps. I'd like to install a small heat source, say a 100w light bulb, running off the generator output, to warm the system up enough to make the most of the brief winter sunlight.

Another question: Do lithium batteries need this low temperature protection? Is it possible to adjust the temp threshold down a few degrees?

Many thanks.

stokie77 asked
Matthias Lange - DE commented ·

2 Answers

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

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

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