Hello
I have some troubles trying to connect my V TAC Battery VT-48200B to the CerboGX MK2
The MK2 doesn’t have BMS Port, but seems any VE.CAN is compatible with BMS.
I created a cable regarding the victron specs & battery specs:
Also I upgraded the firmware with a version that the provider sends to me.
Also I triyed to use CAN protocol Victron in the battery and other protocols
But no communication:
Can anyone helps me?
The DIP of the battery is in '0.
Also I tryed with DIP in 1.
Hello Ruben … welcome to the forum 
First of all, you’re right … the new MK2 Cerbo has 2 CAN ports that you can define … either as BMS-CAN or VE-CAN.
Are the DIP switches all set to “0” and not “1”?
Check whether you have really used the correct pins. So many cables have been built by users themselves and then failed due to a missing pin or a contact error in the RJ45 port.
Is the cable the right way round and are you using the correct VE port …
Try the Pylontech protocol … if available.
Yes.
All dips are at 0.
Alao I tested the cable with a tester and I have conectivity between pins.
Also I tested the 4 ports in Ve.Can1 & Ve.Can2
The config for Ve.Can of the image is correct?
In Ve.Can1 I have also BMS HV config but also is not working.
I will try with other protocols
The instructions say that you should plug a 120 ohm resistor into the second CanPort of the BMS… for stable communication… that’s unusual, but you can give it a try…
Yes, the resistor is comming with the battery and is plugged.
This is tipical for exmaple in oldef vnc networks and in TV & SAT installations
I,m trying now with the different protocols
The differents are:
Can 1.2
can inv-1.0
can sma 1.0
can sen 1.0
can v2.0
can victron
can aiford
can growatt
can growatt v2
With normal Can BMS usage, no resistance is used on the GX…
I wouldn’t know what to do either… because the battery manufacturer doesn’t provide any information to users. 
It may also be that the battery cannot communicate with the GX at all, as it is not listed in Victron’s compatibility list.
I cheked with the multimeter and I see was not connectivity trought CAN L & CAN H.
I opened and resolded the 120ohms resistor and now is working…
Thank you very much because of you last comment I thinked on test the cable
Great! 
Perhaps you could create a brief overview of what you have set up for other users and then mark your answer as the “SOLUTION”…
OFC:
For next users: With V-TAC VT-48200B:
Needed Material:
USB to RS485 adapter
PC Windows 7 or newer
First of all we need to contact to the supplier.
The supplier will send a FW update and a tool:
Install the FW update and inside of the tool select Protocol CAN and write. (To comunicate via RS485 with the tool, we need the DIP at 1)
With that, we need to conect to cerboGX with custom cable:
The other RS485 Cable with the RJ45 with resistor 120ohm between CANL & CANH supplied with the battery.
All DIPS at 0.
CerboGX VECAN port configured as BMS LV.
Thats all.
Now is moment to configure with VEConfigure
Hi @rub3n
Did you tried to modify any of the “Param” values?
If you modify any of the params, after you write them, is your “CAN Protocol” revert to the original default value?
Thanks!
LE:
By the way… You don’t need to set the first DIP at 1 for communicating with the battery on RS485…
Just set the DIP_Addr to the value the physical dips are and you are good to go. One less thing to worry about.
No, I didn’t try to modify param values.
We have any option interesting to modify?
I, for one, had to modify the start of the balancing voltage.
It’s set too high in my opinion and leaving it at default value invites high voltage alarms and disconnects.
Yep,
Today is my first day using this battery and I didn’t know how is working at all.
I’m not sure how I need to configure the battery in VEConnect and what parameters I need to configure (like the start of balancing voltage)
If you can tech me I would be very grateful.
I wasn’t talking about VEConfigure.
I was talking about the UIWare software from VTAC that you’ve already used and the Param tab.
Yes , yes I know, but as I say before, is my first day with the bat and first I need to configure the victron to use it and then I think I can explore this pararmeters
Can you share with me your configs? VEConfigure
This params of the picture are the parameters by default or your tunned params?
The parameters above are the default ones, not the modified ones. It was just a reference picture to point out what I’ve modified.
Below you’ll find a VEConfigure file for a VT-48100E that’s working with a MP2 48/3000 inverter.
!! BEWARE !!
My VT-48100E is a battery with 16 cells, your VT-48200B is a 15 cell battery, from what I know, so don’t use my parameters.
If you want to use them, you should recalculate the voltages for 15 cells.
2025-06-27-cycling.rvsc (4.4 KB)
Ouch,
Thanks I will use your file to check some parameters but I need to investigate about this battery and do the calculators
Many thanks another time!
You can be sure if it’s a 15 cell or 16 cell by looking at the Battery → Parameters section, inside Cerbo’s menu.
If the “Charge voltage limit” is 57.6V (like mine’s), it’s a 16 cell battery. (3.6V per cell limit)
If the “Charge voltage limit” is 54V (or similar), it’s a 15 cell battery.
Yes, it is 54v
