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BMS goes crazy when rebooting Cerbo.

Has new 48v system with Rec Q-bms. When I reboot the Cerbo GX, error code 8 comes up on the bms and the temp sensors alternate between the correct temperature and -999.9, first one at a time and then both, continuing until I turn off the system. While behaving like this, the relay contact pulses and the relay turns on and off every second. When I turn off the bms, the pulse stops after about 1 minute. Is this something I can change in the program on bms, or is this an error in it?

palli asked
palli answered ·

2 Answers

Victron monitoring solutions with 3rd party BMS integration ?

Hi Forum. Thanks to previous posters as it helped me to find the names of some BMS manufacturers with interesting products. Towards that end, I'm probably going to purchase the Orion BMS to use with a Victron monitoring solution that also includes Victron solar controller, inverter/charger, DC-DC converter, etc. Is this any integration possible ( out of the box or with programming ) that can utilize the CAN interface available in both Orion and Victron ? If with some programming then I would enjoy seeing any examples of something on Venus that allowed for use of CAN node not previously possible.

Thanks, Sven

sven-nurber asked
josh-laframboise commented ·

3 Answers

smallBMS, control multiple charger

Setup is:

1. smallBMS

2. Orion 12 12 18 DC Charger

3. Progressive Dynamics Li Charger

1. is controlling 3. via Cyrix-Ct-Li.

How can 1. also control 2. in this scenario? Can I just daisy chain the Control cable coming from the smallBMS "Charger" port and use the non-inverting remote on-off switch to control the Orion charger?

sto asked

0 Answers

ATD connections on Lynx Smart BMS


I have recently installed a similar system to the following link. Model ( On powering up the system the .5Amp external fuse for the SBP blows immediately. If I bypass the Lynx Smart BMS ATD connections the SBP works perfectly. I have tested the ATD connections on the Lynx Smart BMS and discovered they have a negative connection which explains why the fuse blows instantly. Is this device faulty or is there a setting that needs changing?

joshalthaus asked
joshalthaus commented ·

2 Answers

MultiPlus-II connection with Daly BMS / Daly Interface Board (WNT) via CAN?

Hello Together,

I'm trying since a week or so to connect my MultiPlus-II GX wthy my BMS, which is an Daly 16s 48V 250A BMS. It has communication interface (RS485/CAN) and I set it with the PC-Monitor Software to VICTRONENERGY/CAN. I have also the Daly Interface Board (WNT) that they set to Victron Protocol, as they said, before they send it to me.

This is how my Setup looks like:


I also created an customized RJ45 Cable for VE.CAN so they communicate together correctly:
Green/white GND 3 - 3 GND green/white
Brown CAN-L 8 - 4 CAN-L blue
Brown/white CAN-H 7 - 5 CAN-H blue/white

Then I set in the Remote Console the VE.CAN to Other BMS and 500 kbit/s, in the Network status the packets are counting up correctly:



But there is no BMS in the device list or the battery monitor list:


This is how I set up the BMS:


There is an video on youtube where they demonstrate that it is possible:

Has anyone managed to connect an Daly BMS to Victron via CAN? What do I need to do to get it work?

Here is the Datasheet of the Daly Interface Board (WNT):
DL-WNT-V1.0 datasheet of collection board.docx.pdf

Greetings Jack

panicman asked
djdemond edited ·

6 Answers

Multi RS 48/6000 + cerbo gx pylontech battery. incorrect SOC in MultiRS

Hi All

I have a "pylontech" (reality unbranded but shows up correctly in cerbogx CANBUS). connected to cerbogx

also multi RS connected to the VE.CAN on cerbo gx.

Cerbo GX shows correct battery state of charge.

however, the Multi-RS still shows the incorrect "state of charge" for the pylontech battery in its own "victron connect connection".

how do I rectify?

londonflatthing asked
londonflatthing commented ·

1 Answer

Problem with bms v2. Wont switch on mutli plus 3000

Just installed bms v2. It will not allow the possibility to switch on multiplus 3000 using cerbox or vrm. It did work for a few days but now not possible.

Latest firm wares installed on all items

Should the bms assistant be installed?

I have tried with it removed and installed

Message on cerbox screen says not possible to switch on when bms is installled.

Any suggestions greatly appreciated.

db-slv asked
ejrossouw edited ·

2 Answers

connect BMS to Multi RS Solar

Hi everyone I have a solar system with battery using a Multi RS Solar 48/100

The Multi RS doesn't estimate the battery state of charge correctly so I'd like to connect the RS-485 / CANBUS from the battery to the Multi RS Solar.

the technical details of the battery connection is as follows:

RS485 and CAN interface, which supports communicating with multiple machines in parallel and with the upper computer.
RS485 baud rate is 19200, CAN baud rate is 500K.

8P8C RJ45 Pins Assignment (RS485)
Pins Definition
1,3 RS485_B
7 RS485_A
2,6 GND
8 N

it also has a jumper for "victron compatible" output.

this is the battery from aliexpress... I'm using the 7.7kWh version.

Now how should I go about connecting the battery to the Multi RS?

Do I use a BBB (with an add on CANBUS transciever and VE.CAN to CANBUS cable)


buy a cerboGX and connect multi-rs with VE.CAN cable and BMS with "CANBUS" cable


Can I connect the BMS straight to the Multi RS VE.CAN using a CANBUS to VE.CAN cable of some sort?

any help / advice would be appreciated

londonflatthing asked
londonflatthing answered ·

5 Answers

Cegasa SolarGreen configuration with Cerbo GX

Has anyone successfully configured a Cegasa Solargreen battery system to a GX device.

I cannot get the Cegasa to appear on the device list of the Cerbo?

The system consists of 2 X Cegasa Solar Green 5160, 1 X TCC CAN, 1 X Cegasa Hub Com, 1 X Multiplus II 48/3000, 1 X Cerbo GX, 1 X GX touch. ESS system.

The Firmware version on the Cerbo is 2.93. The TCC CAN is not a v02 - does it need to be?

I have tried a number of TCC CAN unit and hubs?

Please get in touch if you can help.

anthony asked

0 Answers

Best 48v BMS

Hi everyone,

I am expecting a shipment of 16x280Ah prismatic LiFePO4 cells. It is my first experience with non-lead acid batteries. I understand that I need a BMS, but there is incredible selection and profound difference in cost between models. I currently have a Cerbo GX which I understand has two data busses, a CAN bus and a proprietary VE.bus. This paragraph is the entire sum of my BMS knowledge, +/-.

I want to find a BMS that integrates maximally with the Cerbo. I'm happy to pay for quality. I don't necessarily need it to be a "supported" solution by Victron, as long as it integrates well. In another group on DIY Powerwalls, Batrium seems to be the most popular name in BMS. Is anyone running a similar system to what I've described, with a Batrium BMS?

What other options do I have? I'm also impressed with REC-BMS, but it's very pricey. A couple other ones I've glanced at are 123Smart BMS, Tiny BMS, Chargery BMS and DIY BMS. Also Daly?

The two most important things to me are 1) safety and 2) integration with my Victron products. This will be a 16s, 48v (although it's not a strict design requirement) LiFePO4 battery with low-moderate current requirements (probably something like a 3000 watt inverter). Thanks for any input!

whafa asked
djdemond answered ·

10 Answers

REC ACTIVE BMS and relays...


I am totally desperate... I have read lots of manuals, forums etc but i am stuck.

I have a

  • victron Cerbo GX
  • victron multiplus
  • 820Ah 12V lifepo
  • victron battery protect discharge relay
  • victron buckboost dc/dc charger to charge from my engine alternator

Although the documentation of the RECABMS speaks about 2 relays (relay chg no and relay dchg no) I understand that if you install firmware 2.90.1 only one is used, being the "relay dchg no", also called the UV.

As I need to
- switch off my DC loads in case of undervoltage through the battery protect
- and switch off my buckboost charger in case of cell overvoltage I installed firmware 2.90.2 which states that the undervoltage and over voltage relays are separate.

So I thought : this is my solution.

But it does not work as intended :

stopping discharge when cell voltage becomes too low
I have connected my "relay dcg no" cable to my "battery protect" H input and when the measured cell voltage drops below the "cell min voltage" of the BMS beeps and the "relay dcg no" goes to 0V and the DC loads are shut off, which is desired and perfect.

stopping charging when cell voltage become too high

When the measured cell voltages are below the max cell voltage, the buck/boost charger charges : perfect
This is normal as the "relay chg no" is at 12V.

However, when the voltage get above the "max cell voltage", the BMS beeps but the "relay chg no" stays at 12V so the buck/boost DC/DC charger keeps on charging.

This is not what I want and not what I expected. I had expected the "relay chg no" to go to 0V and switch off the buck/boost dc/dc charger.

Can anyone explain me what I'm doing wrong? Or is there a bug in the firmware as the readme.txt of the firmware seem contradictory to me.

Thanks for all the help.

carl-dewever asked
rick-ogss answered ·

1 Answer

Add a second LiFePO4 battery bank - is my schematic ok?

Dear all,

For those interested: I'm going to add a second battery bank to my parents' installation.

This is the existing schematic:


I would modify the system using:

15 (not 16 as mentioned initially) times a 3.2V 200AH prismatic LiFePO4 cell, so 15s configuration. (click to open)

A would use a 16s 300A Daly BMS (because I hear nothing but good things about this BMS) (click to open)

Basically I would connect the now 15s (not 16s as mentioned initially) battery in parallel with the other 15s6p pylontech batteries.

Given that each battery in the future system will be connected in parallel, and each with it's own BMS, I don't see a problem;

The schematic would become (adding my homemade battery):



In practice I would simply add the homemade battery to the 2 copper bars, since there is room (free holes):


In theory I could add the system to VRM using CAN cable between Daly BMS & Victron Venus GX, but I don't think that's really needed. But it would be nice to see the battery in the system overview so that my dad can monitor it.

Please let me know if I'm being realistic or about to make a huge mistake.

hdb asked
derrick thomas answered ·

4 Answers

3 Pin Lynx BMS Extension Cables

Hi, I’ve purchased male/female extension cables that go between the lynx BMS and the victron smart battery.

One of the cables connects to the lynx BMS but the other looks like it requires an extra bit to screw around the male part of the lynx BMS.

Does anyone have any tips please?

Luke Rhodes asked
jonothanfox commented ·

1 Answer

Orion-Tr Smart, VE.Direct and integration with GX devices?

Hey there, as I commented on the blog post,

"I'm curious if future versions will have VE.Direct or some sort of integration like that with GX devices? Currently, it seems that the MPPT and MultiPlus are able to coordinate their total charge rate with external BMS via the GX devices. But it seems that the Orion-Tr does not participate in this?"

I'm wondering if there's a way to integrate the Orion-Tr Smart chargers with the CCGX. In particular, as far as I understand, GX devices can coordinate with external BMS via CANBus to determine the charging parameters of a battery. It seems that the Victron MPPT and Victron MultiPlus can respect these limits via VE.Direct and VE.Bus respectively, which is great and a big reason why I bought this BMS and the suite of Victron product.

Now I'm considering purchasing Orion-Tr Smart chargers, however I noticed that they don't have any VE.Direct connectivity, or any other VE connectivity aside from the Bluetooth one. Is something like VE.Direct, VE.Bus or VE.Can planned? Will Orion-Tr Smart chargers integrate with GX devices?

aybabtme asked
Robert edited ·

24 Answers

MPPT ignoring BMS


My system is VenusGX + Multi II + MPPT + Liion Battery + Batrium BMS (connected via CAN-Bus). Everything has been updated to the latest version of firmware.

Batrium BMS has been selected as Battery monitor in the VenusOS, DVCC has been enabled. The problem is that the MPPT is ignoring BMS settings and keep charging batteries when BMS request to stop (Charge limit current set to 0A). I've double checked all of the settings, reboot the system (couple of times), but mppt is still keeps charging when it should stop.

Is there anyone with similar system that can do a quick test and request 0A from BMS to see if MPPT will stop?

Any suggestions welcome



mysik asked
cotje commented ·

5 Answers

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