Is this your first charge. If so the batteries arrive at 40-50% SOC but the BMS starts at 100% SOC. Therefore it takes a while to get the first charge finished. Secondly, the first charge can take a long time at 14.0V to balance the cells and during this period mine warmed up a few more degC.
What is very odd with your screenshot is that you are charging at 14.38V, the NG batteries should only charge to 14.0V so there is something very odd with your system and you are mistreating your batteries and this could be the cause of the continued charging. All connected Victron components should be connected to the Cerbo and under DVCC control so that the BMS limits the voltage to 14.0V. My guess is that your wind turbine is set up with a 14.4V charge voltage because this is not controlled by the BMS. If this is the case, adjust your wind turbine absorption voltage to 14.0V to match the requirements of the batteries, and at the same time make sure that it goes into float with the rest of the system, so only a short absorption period of ay 5 or 10 minutes.
In term the Multiplus, the Multiplus is generating 99W of ac power, so this will be using around 9A of DC power, so as far as the Multiplus meter is concerned is that this is discharging the batteries, i.e. it is taking power from the batteries.
Have you fully read and understood the manuals for the NG batteries and the NG BMS.
To conclude, if I am right about the wind turbine then deal with this as soon as possible to avoid long term harm to your new and expensive batteries.
Thanks a lot for your detailed and quick response!
This is the third charge cycle, and the Balancer state is “Balanced”. DVCC is also enabled (forced).
Your assumption seems absolutely correct—the hybrid charger had a voltage setting of 14.3V for some reason. I changed it to 13.5V for testing, and now I’ve seen the BMS enter the “Idle” state for the first time, in addition to “Discharging”. It seems that was indeed the issue.
Yes, I did read all the manuals, but as a beginner, the root cause wasn’t really on my radar.
Because I had the impression that even when pushing more amps into the system—say, from the wind generator—the BMS would simply stop charging regardless of what’s coming in from the charger/load side of the Lynx Distributor system (e.g., the right side).
If the voltage goes way too high then the BMS will disconnect the contactor and shut the whole system down. The system is totally geared around connected Victron products controlled by DVCC where the BMS through the Cerbo actively manages the charging in the devices themselves. However, what it is not good at is controlling chargers or loads that are not controlled by DVCC. In these cases you have to make sure that the settings on the individual chargers are correctly set and in addition wire them to the ATC / ATD relays if they have remote on/off inputs or add something like a Smart Battery Protect connected to the ATC/ ATD channels. What you really want to avoid is an uncontrolled charger or load from taking the SOC / voltage too high or too low and opening the contactor taking the whole system down.
I installed my NG system a few months ago and it is working well, all chargers are DVCC controlled, I added a Wakespeed WS500 controller onto the alternator to achieve this. Uncontrolled loads have a Smart Battery Protect so hopefully these are shut down before a total system shutdown. Well see how it goes.
The best news is that you have caught the high voltage pretty quick so you should be OK.
Thanks a lot for your response and the explanation! I like the idea of adding something like a Smart Battery Protect to control also the non-Victron Chargers. Will do this adjustment to the system. Thanks again!
