I have a three phase system with 3 times RS smart Solar 48/6000. One of those Inverters does not follow the voltage limit and current limit from the BMS.
When I disable the solar charger in Victron connect for this Unit, It keeps going!! It is overcharging my battery!!
You see it keeps going!
I believe, last time when I was home two three weeks ago, I updated the Inverters to the latest firmware 1.26. Can this be the reason? By that time (winter) charging to 100% was not possible, until now.
All I can see is that the battery is not charging indeed…
That minus on battery current means that the battery is discharging, not charging.
And, of course, part of the solar energy is used for powering loads, not charging…
You disabled the battery charging, not the MPPT altogether…
thank you the very quick response.
Sorry I took the screenshot when there was more demand than solar production.
Here is the continuation of charging, even though the solar charger MPPT is off:
What kind of batteries are you using? 55.2V which is visible in the first post are normal charging voltages for 16S LiFePo, but if you’re using 15S then its indeed a bit much.
What else is in the system, cerbo? Using ESS?
Check your config/communications, this RS is aware of other units as well as AC PV, the other one is not (Notice the additional icons on the grid side)(Also external control vs. inverting)
Yes, let me check further.
It is overcharging again, despite the charge voltage limit of 55.8V it charges beyond and keeps going
I checked the error on the not functioning Inverter. Currently no error:
This is the history of error:
I can not find what #76 means…
That must have been by the time I was last home and made the Firmware update…
So you updated the firmware, through VRM or VC? Did you check that all settings were correct again? Im not familiar with the RS line, but comparing to the Multiplus i would have guessed the one inverter has no Lithium/BMS setting configured and is using standard lead-acid charge voltages
Can you save the configuration of the three RS-es and post their config files here for us to take a look at them?
Use VictronConnect, press on the wheel cog on the upper right (Settings) and then on the three dots → Save settings to file.
There will be 3 .vcsf files. Thanks!
Here are the Files, I named them .txt. You may rename them with the correct file extention.
HQ2233N7HAT.txt (7.3 KB)
HQ22282QEVJ.txt (7.7 KB)
HQ2213AV4VJ.txt (7.8 KB)
In the meantime, I updated all three Inverters to the latest firmware 1.27
At home, my brother switched off the malfunctioning one and on again. However, no change.
Even though the Solar charger is switched of for the xxx4VJ one, it continues to charge. this should not be.
thank you very much for helping me out and check the files!!
You have a situation there…
You have panels on only 2 inverters, right? On HQ2213AV4VJ and HQ22282QEVJ.
But you need to rearrange a little the panels, as on the HQ2213AV4VJ, the maximum PV voltage was even 497V and on HQ22282QEVJ only 203V.
History/Overall/MaxPvVoltage: 497.6300048828125
So, on the inverter you say it keeps charging, you overshot by far the maximum allowed of 450V.
Not to mention the rule where the PV voltage to be maximum 8 times the float voltage.
In your case, at that time the float voltage was 497/8 = 62.15V.
On the printscreen, it checks… 423/8 = 52.87V…
Probably you can see on the history page that you overshot those 55.8V requested by the BMS, only on the days when you have over 450V on PV.
That energy, from the PV, if it isn’t consumed, will go to battery if you overshot 8 times float voltage.
So, take some panels from inverter HQ2213AV4VJ and put on HQ22282QEVJ, or even HQ2233N7HAT, that doesn’t have any.
The series voltage of the strings to be, ideally for RS range, between 250V - 350V.
Jeez, 497V is a lot for a max 450V device. I wonder if its FETs are shot already
No… it seems that it’s still functional, it produces and charges the battery, limiting the voltage to a pertinent one.
Otherwise an error would be logged.
But he needs to rearrange a bit the panels, to get into the specs.
Yes, that is what must have happened.
When I put the system into operation, I had one new PV string installed (connected to one inverter), one old existing PV string connected to another inverter, and one inverter with no PV string attached (for future upgrade). I got the mentioned overvoltage alarm on the old string at that time showing 497V (luckily nothing was damaged), so I removed two panels from the string to bring it down to just below 400V open circuit voltage. That was in summer or spring at a time of day I don’t remember.
My explanation:
Yesterday was cold (~0°C), sunny, and around noon when the battery was full. In cold ambient temperatures, the open circuit voltage increases, and I had the highest irradiance.
Analyzing yesterday’s PV voltage on that string, I can see that the inverter (which I thought was malfunctioning—but it isn’t!) was trying to reduce solar production. But by reducing the power it draws from the string (which it couldn’t push into the full battery), the string voltage rises toward the open circuit voltage.
The string voltage was actually rising yesterday to 450VDC, and then the inverter must have some protection function which was active: when voltage exceeds 450VDC, it pushes more energy than the battery charge limit normally allows, in order to load down the string and keep the voltage capped at 450VDC max.
Thank you all for your great help. This is what must have happened. I know now what to do! Thankfully nothing is damaged, and it was a great learning experience. Issue Closed 
This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.