Cerbo GX Mk2, no CAN2

[AxelT (Axel Tropp)]

Hi all,
I’ve running a new ESS with a Cerbo MK2 and there is no CAN2 available. Change of Firmware has no effect. In the moment, newest 3.54 ist running. No failure code is reported.
Last Saturday I talked to employees of TransWatt, the German Part of Victron Energy at the BOOT Düsseldorf, and we could reproduce this problem via VRM. They assured to forward this item to VE developers.

[M_Lange (Matthias Lange - DE)]

What exactly do you mean with that?
Can you add a screenshot?

Did they reproduce it with an other Cerbo?
Can you try to go back to the previous version?

[lxonline (LX)]

3.50 / 3.51 : VE.CAN losing connectivity to VM-3P75CT (Grid & AC Loads Enphase)

In my case I don’t believe it needs to be terminated as it is an active termination. Mind you… it already works now without one (and has been working for over a month now). I also see that you have a MK1 of the Cerbo having a BMS-Can whereas I have a MK2 with two VE.cans (VE.can 1 and VE.can 2). So this is not exactly the same. Grr… still don’t know why this is. I might have to swap them to see if it makes any other result, or wait for an update of the firmware to see if it gets resolved.

If firmware is not fixing it it could be a hardware issue

[alexpescaru]

It is for sure a hardware issue, that the firmware only tries to mask…

See here, where Victron admits that there is a hardware issue and they are already making modifications to the hardware itself.

CAN communication problems on Venus OS 3.5x?

There was a hardware issue, but one that is well handled by the firmware solution. I don’t know the very low level details, but the issue was the CANbus interface would be interrupted and ‘disappear’, and then not automatically re-initalise which required rebooting the Cerbo GX. This firmware update now re-initalises the interface without requiring the reboot of the device itself. Simple and effective. In all but the most extreme cases where an RMA is required, and this is so far very rare, th…