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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

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
Anil Ghatikar answered ·

7 Answers

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
SolarHack edited ·

2 Answers

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

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
Daniël Boekel (Victron Energy Staff) commented ·

8 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

BYD LVL and Orion

Question to check use of Orion 48v to 12v on a BYD LVL system. Are there any concerns to be aware of, e.g management of discharge and battery protection. Would battery protection be controlled by the BYD's own protection or does something need to be done with a relay from the GX to control the On/Off of the Orion? Thanks

OGRT asked

0 Answers

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

BMV SMART-712 'Charged Voltage' & other settings for BYD B-PLUS 51.2V setup?

Hi from Christmas Island, with a couple of 100% off-grid, solar setups, each using a bank of 4 BYD B-PLUS 2.5. 2.56kWh, 51.2V, LFP Battery Units. I've installed a BMV SMART-712 shunt to hopefully give more accurate SOC, but am unsure on exact charge values I should dial in, really struggling to find answers online, and all businesses I've reached out to haven't really been able to give me any info. My system uses a Victron MultiPlus 48/3000 35-50 and a BlueSolar Charger MPPT 150/70.

Main question is - What should 'Charged voltage' be? I have it set to 56.8V (it was on 55.2V for ages which seems low and may explain why my batteries never seemed have much capacity). Some battery spec sheets (and written on battery itself) say "Working voltage: 44.8V-57.6V" but other spec sheets for the same battery say "Operating Voltage Range: 43.2~56.4V". If it's too low I worry i'm not getting full capacity from my battery (critical in my case), and if too high I worry I'll fry it somehow.

I'm more confident about the other settings, but would love some reassurance:

Discharge floor: 90% (I assume that's correct way around, not 10%)

Tail current: 4%

Charged detection time: 3m

Peukert exponent: 1.05

Charge efficiency factor: 98%? (I see mentions of only 'round trip efficiency 95-96%' on the battery specs though? Sounds low?)

Current threshold: 0.05A

Time-to-go averaging period: 3m

Thanks very much, I'd really appreciate some advice.


Swell Lodge asked
Swell Lodge commented ·

2 Answers

Is a Quattro 2 Imminent

Planning to use a larger Quattro (8000 or 10000) with BYD Battery LVL 15.4kW. Given the introduction of the Multiplus 2, is the Quattro 2 also due for an upgrade. If so are there any planned dates?

OGRT asked
ejrossouw answered ·

1 Answer

3 phase generator used in single phase off-grid system with 3 parallel Quattro 48/10kva

Hi Guys,

Just would like to know if it is possible to use a 3 phase generator charge feed input into 3 Quattro's that are in single phase parallel arrangement? ie use one phase per Quattro to charge DC onto common DC bus connected to BYD 30kw system. cheers

Gannos asked
Matthias Lange answered ·

1 Answer

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

Recommended DC cabling/fuse/breaker BYD LVL to 3 x MPII 48/5000 and 3 MPPT


What is the recommended DC interconnect between:

2 x BYD LVL 15.4,

3 x MPII 48/5000 and

up to 3 MPPTs ?

The Lynx systems (with the 600A internal fuse in the Lync shunt) looks OK, but the related documentation is focussing on other batteries.

According to the BYD/Victron documentation I expect problems with the BYD BMU and Lynx Shunt VE.Can connection to the CCGX.

What are the recommended fuse levels and breakers (if required) ?

Is the Lynx Shunt required at all with the BYD BMU is use anayway ?

best regards,


martghh asked
Guy Stewart (Victron Community Manager) commented ·

1 Answer

BYD BMS low current draw

Hi All,

Can anyone confirm if the low current draw issue on the BYD BMU was resolved? I.E If i current lower than 1A per module was drawn the BMU wouldn't acknowledge it and allow you to drain the batteries with a small load whilst still reporting it as being 100%.

In the comments section of the victron compatibility for the BYD batteries;

Guy mentions in a comment that BYD are aware and are hoping they are working on a fix.

Has a fix been found?

I will probably use an external shunt anyway, but Guy mentions that it shouldn't be used to start a generator too based on SOC, which is exactly what i want to do with it.



Rich. asked
Rich. commented ·

1 Answer

BBox SOC making large jumps with little load/charge

Hi all

The SOC on my B-Box 10.25kw battery stack jumps by around 25% at certain points in the charge/discharge cycle.

This became a problem this morning as I was expecting a 4 hour power outage. I had the SOC at 50% overnight, in preparation. The SOC dropped from 45% to 20% in a few seconds during the outage - power draw was in the region of 1kw at the time.

Then when recharging, it bounced up 25% again almost instantly.



I looked at the batteries this morning and noticed that one of the units does not have flashing lights on it. Am I looking at a failure here?



Sinbad asked
Sinbad answered ·

4 Answers

BYD Premium LVL 15.4 to Victron Compatibility

It appears BYD will end the B BOx Pro 13.8 and the above 15.4 is replacing it.

Has this new model been connected by anyone in the Victron community and is it as straight forward to set up as the old B Box Pro 13.8?

The Victron Compatibility page does not have the new battery listed yet.

Nawir asked
mvader (Victron Energy) commented ·

3 Answers

Victron Quattro Combined With BYD B Box goes into passthru


We have setup a Victron 10KVA Quattro with BYD B-Box 13.8.

The inverter goes into passthru as soon as PV drops off in the evening.

The battery sometimes discharges for a brief period, about 30 minutes or so.

jonjex asked
Guy Stewart (Victron Community Manager) commented ·

1 Answer

Any special tricks for using a Mk3 on a multiplus that is linked to BYD batteries via Venus GX?

I have a Multiplus 2624 on firmware 431 connected to a Venus GX and some BYD batteries. When I want to change the input current limit I can do this using VRM>device list>download file>VEconfigure>save file etc but a few weeks ago I got an on-the-go adapter for my Mk3 interface and used VictronConnect to access the Multiplus settings really quickly and make changes using my Android phone. This was so much easier, but when I tried to do it again yesterday the Multiplus would not show up on VictronConnect nor could I connect with it using VEconfig on my laptop and eventually the Multiplus shut down because it could not see the Venus and I had to go back to the old way.

My question is what went wrong? The Mk3 works well normally. I unplugged the VEbus from the Venus GX and plugged it into the Mk3 and went looking for the multiplus but it's not there. Wondering how to make that work like it did before. Any suggestions? If you tell me to update the Multiplus firmware then I ask how, without a Mk3 connection?

Thanks for any wisdom.


scoraigwind asked
scoraigwind answered ·

2 Answers

MultiPlus-II 48/3000 and VE.bus Error 1


I have UPS installation with 6xBYD B-Box Pro 2,5 and 3x MultiPlus-II 48/3000.

Few times a day System shuts down for very short time (seconds - after that wakes up) and Color Control indicates that Error #1 then occurs. There is no grid loss then as well.

I have checked what could cause error 1 and didn't find it in the system:

-no overload

-no low battery

-no temperature alarm

What can be the reason of situation described with words "Device is switched off because one of the other phases in the system has switched off "?

Can it be caused by defective Multi which works properly all day but 3-6 times a day turn off itself for a while?

I just installed video recorder to find monitor LEDs an each Multi.

TechSol asked
ejrossouw answered ·

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
JohnC commented ·

4 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
Daniël Boekel (Victron Energy Staff) commented ·

3 Answers

Frequency shift too slow in the Quattro+ BYD battery +SMA SB solar inverter system


Running the Quattro with L series BYD battery (14kw) results in the battery shutting down, due to the Quattro taking extremely long time to start shifting the frequency (around 8-9 seconds from the point of BYD charging limit going to 0, utill the Quattro frequency actually start to increase)

I know the L series batteries are not current meant for the off-grid applications, but they are advertised for the backup applications, in which case Quattro has to be in position to adjust the solar inverter on time in order to prevent the battery overcurrent, should the grid fails during the day

Any suggestion if this problem can be fixed, or has a workaround ?

With best regards,

Oleksiy Frolov

fanda_eu asked
fanda_eu answered ·

2 Answers

Question regarding the BYD battery overcurrent failure with Quattro

Hello. The original question thread:

Is it possible to get an answer to the question regarding the proirity of the charge current assistant over the current limit set by the battery ?

fanda_eu asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

Victron Quattro with BYD battery overcurrent failure

Hello. Our system is Victron Quattro 8kVa with BYD L-box of 14kw and the SMA SB 5 kw solar inverter. The system is configured with Color Control/ ESS in the self consumption mode

The problem: Just before the SoC reaches 100%, the battery might disconnect with overcurrent error message, indicating about 32A in the error message. The battery will reconnect after 4-5 seconds. This occurs normally once per day. The problem can be reproduced when the SMA inverter output is about between 1 and 2 kW.

1. Is it possible to verify that the supplier has provided the correct firmware version for the BYD batteries ? It seem to be below what is recommended, but I might be mistaken


2. I've uploaded the video demonstrating a problem:

the system fails at the index 1:48 min

additional info:

the problem happens both in grid-connected mode and in the isolation mode

when it happens, the Quattro will enter "absorption" mode, and it seem to try maintaining the absorption voltage commanded by the battery, while no longer respecting the charging current indicated by the battery.

Any assistance is appreciated

Best regards,

Oleksiy Frolov

fanda_eu asked
fanda_eu edited ·

1 Answer

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