October 18, 20241 yr Hi all, i have a problem and i can't solve it. I have a lithium battery, I will specify the values under the text. I' am using Voltronic inverter and Bms communication successful between battery and inverter. But When soc is 100, the inverter continues charging and the battery receives an overvoltage error. Could you help me please ? Voltage: 48-56Vdc Nominal Voltage: 51.2 Vdc Rated Capacity: 100ah
October 18, 20241 yr You should provide more details on brands, models, error code, inverter configuration, etc. Otherwise, it will be very difficult to help.
October 18, 20241 yr Author Inverter mode: Voltronic InfiniSolar 15kw Battery model: CFE 5100 Error code for battery: Overvoltage protection. But i can not see any error for inverter side Edited October 18, 20241 yr by solarengineer
October 18, 20241 yr What is the displayed battery voltage at the time that protection kicks in, both what the Inverter indicates and the battery. That is of course if you have a way of seeing the data? Can you access the voltages (total and per cell) via an app to see if it's a cell or whether it exceeds the battery voltage BMS protection, whatever the value is set to.
October 18, 20241 yr Author I can see the battery voltage equally through the inverter and battery app. But bms continues to charge when it should cut off the charge at 56 volts, for example.
October 18, 20241 yr 5 hours ago, Mauritius B said: You should provide more details on brands, models, error code, inverter configuration, etc. Otherwise, it will be very difficult to help. I was about to ask what a lithium battery is lol but just said I should behave.
October 18, 20241 yr 21 minutes ago, solarengineer said: it should cut off the charge at 56 volts If this is your battery, then the cut off should be 57,6V (max charge voltage). Up to that voltage it should give a warning only. Unless of course the manufacturer has revised the Firmware?
October 18, 20241 yr Author The inverter charges up to 60 volts, although it communicates with the BMS.
October 21, 20241 yr I would not run that system of it continueslly over charging Best test the volts on the battery with an multimeter. Have you tried user mode and see if it then does follow the set volts on bulk and float setting . If it works right with use setting then there is a miscommunication on li mode .
October 22, 20241 yr On 2024/10/18 at 3:55 PM, solarengineer said: The inverter charges up to 60 volts, although it communicates with the BMS. Why not try to cut BMS communication and let the inverter manage the charging on the base of battery voltage. It works to my satisfaction for over 4 years on my system.
October 22, 20241 yr On 2024/10/18 at 8:09 AM, solarengineer said: and the battery receives an overvoltage error I'm guessing this is not an actual battery, but a cell over voltage error, this usually occurs when the BMS is incapable of balancing the cells quickly enough/with enough current to keep the over voltage from rearing its head, like @Beat wrote, I'd also suggest putting the inverter into Lead Acid mode, where you specify the Voltages and no BMS comms, this will allow the BMS to stop charging, when one cell gets to over voltage limits and get to work balancing things, eventually probably accepting some more charge, once the over voltage situation has been resolved...
October 23, 20241 yr 17 hours ago, Kalahari Meerkat said: I'd also suggest putting the inverter into Lead Acid mode I would rather suggest to set "user defined battery". And then set bulk charge and floating voltages according to battery specs. One never knows what the programmer has packed into that "Lead Acid Mode". Besides @solarengineermentioned lithium batteries.
October 23, 20241 yr Author When i set "Use Mode" I also enter the voltage values. Even though I set the bulk voltage to 56.4, the inverter continues to charge and gives an error when the battery reaches 60v.
October 23, 20241 yr 34 minutes ago, solarengineer said: When i set "Use Mode" I also enter the voltage values. Even though I set the bulk voltage to 56.4, the inverter continues to charge and gives an error when the battery reaches 60v. It looks like there is something wrong with your BMS. In my case I run my system on User mode, and I can clearly see once the individual battery cells are at 3.5 V = 56 V the BMS stops the inverter from adding more charge to the Battery. Edited October 23, 20241 yr by Antonio de Sa
October 23, 20241 yr Author 4 hours ago, Antonio de Sa said: It looks like there is something wrong with your BMS. In my case I run my system on User mode, and I can clearly see once the individual battery cells are at 3.5 V = 56 V the BMS stops the inverter from adding more charge to the Battery. I tried User mode and i set the battery voltages. Bulk voltage 56.4V, float voltage 54.4V. But inverter still charging battery until 60Volts. After that battery gives "OverVoltage Fault"
October 23, 20241 yr 5 hours ago, solarengineer said: the inverter continues to charge and gives an error when the battery reaches 60v. Did you cut the BMS to inverter comm and disable equalization? If so this would be a malfunction of the inverter.
October 24, 20241 yr 14 hours ago, solarengineer said: Yes I tried but the Voltronic side doesn't help at all Looks more like your inverter mite be faulty best have it checked out
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