Hi @ Alex Pescaru,
Unfortunately, our original chat “There is still a problem with the MPPT Can SmartSolar firmware 3.18” has already closed, but as you were a great help to me in troubleshooting and analysing the CAN traces, I don’t want to keep my findings from you:
As I expected, there is an analyser for CAN NMEA2000 traces that can be configured via XML and is open source!
You can download it here: GitHub - canboat/canboat: CAN Boat provides NMEA 2000 and NMEA 0183 utilities. It contains a NMEA 2000 PGN decoder and can read and write N2K messages. It is not meant as an end-user tool but as a discovery mechanism for delving into NMEA 2000 networks. · GitHub
and build it for Linux or Windows. Using the default settings, I analysed a trace, which I also sent to you.
The results look very good to my mind:
cat CanDump20260506_V3.18_Oceanvolt250kbit.txt | candump2analyzer | analyzer -json > analyzer.output.json
Hi @ Alex Pescaru,
I have one more question, as I’d like to understand this. In which log file did you find the 0 V? I’ve now gone through a few logs and haven’t been able to find any entry with “Voltage”:0.
I will take your first log from April 6.
This one: CanDump20260406.txt.zip (203.7 KB)
Here is a cut (see line in front), where the Cerbo (E1) is broadcasting (FF) the value 0. (marked 00 00 00 00)
(01 20) means 0x2001, which is the VE_REG_LINK_VSET register.
In the same log, the controller (24, decimal 36) is broadcasting (FF) the value 58.4V (D0 16 00 00, which is 0x16D0, decimal 5840)
On the same VE_REG_LINK_VSET register (0x2001)
So two entities broadcasting a value for the same register.
One 0V and another 58.4V
But Victron clearly states for the 0x2001 register:
“Charger link, voltage set-point (un16 = voltage [0.01V], read-only), only the master broadcasts voltage set-point”
So… which master?
Because it seems that there are two… 
Probably, on the later firmware versions, there are some changes about who takes priority on such cases…
More info on the CAN bus transactions, here: https://www.victronenergy.com/upload/documents/VE.Can-registers-public.pdf
I’ve found it now! The tool doesn’t convert the value as a voltage, but as a register value without a unit.
It’s a bit tricky – you have to convert the values from hex to decimal
