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BYD LV Flex not working

I have 1pc BYD LV flex 5kWh connected to a cerbo GX, Multiplus II 5KVA and 2pcs bluesolar 150/45. I commissioned the battery, made sure all the cables are connected correctly including the special VE Can to BMS Type A cable but the battery doesn't work. Both the BMU and battery continuously blink white and then blue alternatively. I connected the cerbo to a separate 12V battery and accessed the console. It detects the battery but shows it at 0% with no voltage or current. The inverters and controllers are also not turning on or being detected on the cerbo. When measuring the battery voltage at the terminal there's less than 1V. However when accessing the BMU with Wifi, it shows that the battery is at 33%.

mufmur asked
Alexandra commented ·

2 Answers

PYLONTECH US3000C or BYD LVL15.4 with QUATTRO 48/10000?

Hi everyone. We're looking to replace the flooded lead acid batteries on our existing system. We have a Victron Quattro 48/10000 two BlueSolar MPPT's, a BMV-712 and CCGX. The two VE.Can ports are available on the CCGX to connect the new battery so I don't think we need to upgrade to the Cerbo GX.

Our research has narrowed the options down to two choices. 5 x Pylontech US3000C or 1 x BYD LVL 15.4. I spoke to one installer that used to favour Pylontech and he recommended the BYD due to the amount of small issues he's had with the Pylontech installations, often needed to reboot. The final Canberra Battery Test Centre report strongly suggests the Pylontech will perform very well longterm and the BYD was poor.

I manage the system remotely most of the time and have someone onsite who can help. We depend on the system for uninterrupted power for our clients so reliability is key.

Is there anyone here who has experience with both batteries and the Quattro 48/10000? I'd really appreciate some guidance in order to make the right decision please.

Thanks for reading.


jeffc asked
Alexandra 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
squaresmurf answered ·

3 Answers

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
bart-champagne edited ·

3 Answers

Multiplus 2 ne redémarre pas après batteries BYD LVS à 0% puis rechargée à 30%

Bonjour. Ma config est la suivantes: 2 MPPT 450/100 + 1 Multiplus II 48/5000/ + 1 batteries BYD LVS 12 kWh, le tout raccordé (ESS) au réseau pour injection du surplus avec SOC à 30% . Lors d'un coupure du réseau la batterie BYD s'est déchargée à 0% et le Multiplus s'est mis en mode "en panne" (off).

Puis la batterie BYD s'est rechargée en journée à 40% (toujours sans le réseau). Mais le Multiplus est resté en mode en panne. Il a fallu l'éteindre pour qu'il redémarre correctement (toujours sans le réseau).

Pourquoi, s'il vous plait, n'a t'il pas redémarré tout seul après que la batteries se soit rechargée. (pourquoi a t'il fallu l'éteindre est le rallumé pour qu'il fonctionne à nouveau) ?

synelios asked
Thierry Cortassa (Victron Energy Staff) answered ·

1 Answer

Multiplus shuts still shut off when battery was empty and them 40% full


After grid shuts down, my BDY LVS battery turn to 0% (battery was empty). And the Multiplus turns to default. Then the battery runs to 40% with the 2 MPPT 450/100 (Multiplus still off grid). But the Multiplus was still on default (off). After switch off and switch on the Multiplus was working properly (no more default).

Why the Multiplus did not restarted alone when the battery was recharged at 40 % ?

(the SOC was set at 30%)

synelios asked
Alexandra commented ·

0 Answers

AC Coupled ESS minimum battery size


We are installing a AC Coupled 3 Phase ESS (Grid Connected) system with 15kW 3P Fronius connected on Output of 3 x 5kVa MultiPlus II. Were planning on installing approx 30kWh of BYD lithium, however i noticed on the Victron AC Coupling & Factor 1.0 rule page there is also a minimum battery size required. (in this instance it is 48kWh)

Can anyone explain this?

30kWh of BYD will deliver 30kW of power & accept up to 20kW of charge.
If the PV inverter was on the Input of the Multi the minimum battery size 3 x 2.5kWh modules acording to the Victron/BYD guide.



Nick Gillam asked
Daniël Boekel (Victron Energy Staff) commented ·

4 Answers

Question about input VS output power and stored in battery

Hi, in my previous question I ask about the SmartShunt functionning. This additonnal equipement is here to help to understand what is the problem with my installation, but in fact doesn't help due to the low load on the Orion TR
More context:
-EasySolar 48/5000
-2 Orion TR48/XX now connected to the battery via the SmartShunt
-1 BYD B-Box Pro 10kWh (model from 2018, 4x2.5)

My problem is, I've seen my total input power for a period of time is much higher than my consumption and theoretically missing capacity in the battery. Here are 3 pictures of 3 days with Grid/Generator input + solar, with small consumption (the Orion output only drain few watts most of time and sometime near 200W but no more)




I've contacted EFT-System, the official BYD service company in Europe. But they only tell me "You are reading the data incorrectly. Adding those two values (solar + grid) does not give you the energy that has been charged into the battery. ". Nothing more...

This night (last picture) I've charged only with the generator, and this time I don't have to do any calculations. I've checked during the night, the battery has an input power between 1 and 1.15kWh. I start to charge when the battery was at 20% (I assumed 2kWh remaining).

Someone here can help to understand this value? Is my battery defective?

Thank you :)

lambish asked
lambish answered ·

7 Answers

MultiPlus don't reduce charge current commanded from BYD


This system, 3 parallel MultiPlus-II 48/5000 with 2 BYD BBox LV 14kWh and 2x 250/100 MPPTs.
Its recharging during night time via generator control (No ESS or such).
Now the batteries shut down short after fully charge 100% SOC.
It looks the BYD commanded CCL 0A, but MP-II is still charging with 25 Amp.
Battery shut down after a while.


DVCC is active, no shared sensors are active like victron battery compatibility doc recommend.


Any ideas / thoughts?

Thanks a lot. Saludos

Silvio Franceschini asked

0 Answers

BYD LVS 8kW problem.

Hello. looking for help with a battery issue.

Installed an EasySolar II 3kVA with the above mentioned battery system and 3.6kW solar array.

All worked well for the first 12hrs but then the BMS signal was no longer received by the inverter which forced the solar reg to almost shut down.

At the same time I was monitoring the battery info via the BYD B Connect app and noticed that the "output" voltage was a few volts below the "battery" voltage with a small load on the inverter, ie 53V displayed for battery voltage and 49V displayed for output voltage. Consequently the inverter started to show low battery volts error messages.

The same readings were reversed when I tried to charge the battery via the genny. Higher output voltage than battery voltage.

This suggested that there was a dodgy connection somewhere in the wiring of the LVS top cover. Does this theory sound correct? I took the two end covers off the top and tried the tightness of all the connections that I could see but there's a lot of stuff in there that you can't get to and there's also a big rotary switch which is sealed. But could that connect fault have cussed the BMS to stop sending a signal to the inverter?
Any thoughts on the above would be great. Ive ordered a new BYD top and bottom for the battery but if that doesn't fix it I'm stumped. Sent all this to BYD a few days ago but no response so far - which is fairly normal.

bunya-solar-pl asked
bunya-solar-pl answered ·

4 Answers

BYD LVS - Strange increase of "min/max voltage" difference after 100% charge

Hello everybody,

I have an offgrid system, running for 1 year, made of a 8kWh BYD LVS battery, a MPPT RS450-100, and a Multiplus II 5000 VA.
Everyday, after the battery reaches 100%, I observe a strange increase of the max cell voltage, during hours :


Is it normal ? Does anyone have an idea of what happens ? The BMS should be balancing the cell's voltage instead, no ?

Thank you very much for your help

bluefab asked
bluefab answered ·

2 Answers

Orion-Tr DC-DC 48/48 Converter as charging interface between small 48v turbine and BYD

Off grid site. Customer wanted a bit of background power to maintain the system voltage in winter. Sporadic windy location. BYD lithum battery system. MPPT, Multi 8000, CCGx

We have attempted to use a small 300w 48v turbine that is suplied with a Morningstar PWM charge controller - but this is ineffective, due to the generally higher maintained voltage of the BYD's - The turbine rarely if ever touches a voltage above the BYD... so charging doesnt occur.

I am considering using the Orion-Tr DC-DC 48/48 Converter - as an interface between the BYDs - and a small lead acid battery setup off the Morningstar. The lead acids would buffer output from the turbine, and keep this operating in its voltage sweet spot.

Setting the Orion output at circa 54v say....

One thing i am not sure about (the manual is a bit scant to say the least !) is any low voltage disconnect capability with the Orion. The Morningstar charge conttroller dosnt appear to have any sort of output control to switch a remote load (like the Victron MPPTs do)

Thoughts on pitfalls for this idea?



Chris asked

0 Answers

BYD LVS 4 setup

Hi Victron community.

I'm setting up 6 x BYD LVS 4's onto a DC bus for a 3 phase Multi II off-grid system.

The Be Connect config app asks for Single OR Three phase configuration.

Am I right in thinking it should be Single phase onto the DC bus?

Thanks in advance, Marc

stad asked
Alexandra answered ·

1 Answer

Errors 2 and 29 on MPPT RS charge controller with BYD battery

Hello colleagues. We use BYD batteries in most of our installations. On some of our systems, after commissioning or adding new batteries, we get BYD high voltage notifications in the "Remote console" (screenshot 1). This is not a critical error and is not written to the "Alarm logs", but it does make our customers worry.


In reality, the battery voltage is far from the permissible maximum, and if you go to the menu of the battery itself immediately after receiving the notification, you can see that all the parameters are normal and it works fine (screenshot 2).


It's just that while the batteries are new and the cells are not balanced enough, the Victron system interprets this as a "high voltage" of the entire battery and starts to warn about it in this way. After a couple of weeks or months, these notifications stop. A similar problem is described here using Pylontech batteries as an example:

But lately (and only on some new systems) we are facing more serious errors 2 and 29 on MPPT RS charge controllers. I can't figure out why this only happens on some systems even though the settings we make are the same. I know that the PV voltage at the input of the MPPT RS should not exceed 8 times the float voltage of the battery, and we are far from that limit. Firmwares on all devices in the system are updated to the latest versions, as well as Venus OS. DVCC is enabled.

On one of the systems there was error 29, I carefully checked all the settings and, not finding any deviations, left the system running in this state. As a result, this error stopped appearing after three weeks (screenshot 3).


A couple of days ago we started a new system with an RS controller and a BYD battery and I see errors 2 and 29 again (screenshot 4). When I look at the battery voltage charts in the "Advanced" section, I see perfectly normal values (screenshot 5), but when I go to the MPPT RS menu in the "Remote console" I see a very high battery voltage (screenshot 6). Where does it come from? This value conflicts with all settings. At the same time, there are no errors in the menu of the battery itself. Maybe there is some problem in communication between BYD equipment and Victron?




I understand that it is possible to limit the voltage in DVCC, but on most of our systems (with the same set of equipment and settings), there are no such problems. I don't want to do many individual settings for the same systems, it can be confusing.

I will be glad if Victron employees or installers who successfully coped with this problem answer.

romarub asked
romarub commented ·

3 Answers

PASSIVE ERROR - Problem to get communication started between Multiplus 2 GX and BYD B-Box BMS

Dear Forum,

hope you can get me some hints regarding the setup between BYD B-BOX (L3.5) BMS and Victron Multiplus II GX (3000er), which I bought new.

I recently bought the BYD B-BOX battery used from another user who had it running with a Victron Multiplus but now switched to PylonTech.

My setup is as following: MPPT SmartSolar DC connected to battery (short test: charging works, as indicated by the BYD battery (low rate white LED flash and battery voltages are in a reasonable range) and Multiplus GX connected to the battery.


Actually, I not have AC-IN connected to the grid nor the EM24 (my electrician will do that next week). Connection with SmartSolar via the VE.Bus worked very nicely. Also I follwoed the video instruction of Guy to setup the Victron for first Multiplus setup (setting to 500kBaud, DVCC, etc). I used a Typ A cable for the CAN between BMS and VE.CAN. I have an end plug / resistor on the VE.CAN as well.

Status message after reboot the Multiplus is: Not connected. In the BMS-CAN port i found following error message: Error-passive TEC:0 REC:128. Some Multiplus continues pushing packets. See the screen shot below:


Do you have any hints which root cause the error message may have?

Thanks for your support!

uksubs asked
uksubs commented ·

3 Answers

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