I noticed randomly (every couple hours or so, I haven’t noticed an exact schedule yet) that my ESS (Cerbo GX, multiplus II, MPPT controller with solar panels, other brand batteries behind a smartshunt, and grid meter) doesn’t look like it’s generating solar. It says it’s in passthrough mode. It seem…

Been a while and thought I should come update. Both the latest stable release (3.62 and 3.60 as well) and the latest beta (3.70~6) are so much better. Thank you. I have still seen it flip over to passthrough likely due to not receiving good data from the meter, but before it took between many minu…

How have you gone with this? I’ve got exactly the same issue — seemingly intermittent randomness that doesn’t have an obvious cause. Irritating as like you point out, it puts the system in Pass-Thru mode, throttles down my Fronius inverters and really impacts useful production. The VM-3P75CT is ru…

I’ve just watched it regularly and rebooted the cerbo when it happens. It seems to only happen when the battery is in the 80-89% or so soc range. Super frustrating since I had cheaper options and went this route since Victron is high quality. Hardware is great, but this is very frustrating. Often,…

I have a lead! I think this is a subtle network issue (i.e., WiFi is crap), interplaying poorly with the communication protocol Victron have chosen for the VM-3P75CT and a bug in dbus-modbus-client. I caught this in the act today and I’ve got an idea why it’s misbehaving. From /var/log/dbus-modbus-…

Interesting. Network trouble crossed my mind but I can’t make the cerbo network connection fail in any way in terms of it missing a ping which leads me to believe it has a solid connection. Also, other devices in the same area as the cerbo work fine. Also, it only ever happens when charging batteri…

Just went looking online at release notes for the meter and cerbo and you wouldn’t guess what I found. I found it here . Specifically this part: v3.60~61 till v3.60~65 General Fix VM-3P75CT on LAN connection issues Decided to get all crazy and install the beta (v3.60~66) and we’ll see what hap…

Well, I’m mixed. Overall the meter response time and overall performance appears to be better, but it has done the same thing once still. I don’t think I can say it is fixed, but I do see improvement with the meter being seen by the cerbo. Maybe we’ll get meter firmware that in conjunction with the…

Hey all, thanks for your reports! We made improvements to the comms stack, and expect that the here reported issue has been solved. Note that using wifi anywhere in the path between the meter and the cerbo will always remain to be suboptimal. Depending on signal quality it can be, and in most cases…

That’s great! Thanks for your work on this. I just installed the beta and we’ll see how it goes. Obviously wired connections are better but as long as we get this bug fixed I think the cerbo works well enough on Wi-Fi in this case to be worth using versus having to get Ethernet cable to it at this…

Well, it doesn’t seem to have fully fixed it @mpvader It happened again today. The biggest difference I noticed is that typically restarting the cerbo fixed it but this time I restarted the cerbo 3 times and it was not fixed. I then cut power to the meter, gave it a minute, then power cycled the ce…

VM-3P75CT Meter disconnecting frequently

DIY

ndrew (Andrew) 9 May 2025 05:11 10

Greatly appreciate the update, @mpvader! I’ve installed ~71 and am looking forward to seeing how it goes… before I change to ethernet!

Firmware issue 3.7X

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VM-3P75CT Meter disconnecting frequently

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