Charge Controller Error code & Inverter Protect Mode

[Hoop33]

I have an off-grid pole barn. Here's a picture of my setup. Everything is working great except when the battery gets to 100% charged. When I get to 100% the inverter goes into protect mode. This has happened twice. Both times I turned off the PV breaker to stop the system from charging. Also, I noticed the charge controller had an "E2" error code. "Battery Over-Voltage". I have setup the parameters based on the charge controller and battery specs. Do you know why the system is kicking out when the system reaches 100%? For now I am cutting off the PV breaker when I am not there to monitor the system. Thank you! Any advise will be much appreciated.

 

[Mattb4]

New Lithium batteries can have a cell trip the BMS on high voltage. Once it does the SCC's voltage to the common DC bus spikes up above the high voltage setting. It is usually best to set your batteries boost/bulk charging voltage down a bit giving the cells a chance to balance. My choice has been 3.55v/cell. You might check your BMS settings to see at what voltage balancing commences and also what is high voltage cutoff.

 

[mikefitz]

I have setup the parameters based on the charge controller and battery specs. Do you know why the system is kicking out when the system reaches 100%?

Setting up the Renogy Rover controller can be difficult for an ideal profile. Also the Renogy calibration can be out of specification, producing higher chargd volts than expected. The default settings in the Renogy controller for lithium is 14.4 volts , boost volts, there is no float stage. It can be set for different system voltage, so ensure it's set for your 12v system.
As suggested by Mattb, lower charging voltages with new Litime batteries is advised. Suggest you start with GEL settings with a user adjustment for boost volts to 13.8 volts. This will give a value of 13.8 volts to both boost and float.
General comments.
The cable size in the picture seems too small for a 12v 3000/6000 inverter.
Can your batteries deliver the 300 amps needed for the inverter?
Previous posts identified battery over overvolts with the same controller and damaged occured to various parts of the system, also with a too high array voltage.
Have these problems been fixed?

 

[Hoop33]

New Lithium batteries can have a cell trip the BMS on high voltage. Once it does the SCC's voltage to the common DC bus spikes up above the high voltage setting. It is usually best to set your batteries boost/bulk charging voltage down a bit giving the cells a chance to balance. My choice has been 3.55v/cell. You might check your BMS settings to see at what voltage balancing commences and also what is high voltage cutoff.

Will do. Thanks for the advise.

 

[Hoop33]

Setting up the Renogy Rover controller can be difficult for an ideal profile. Also the Renogy calibration can be out of specification, producing higher chargd volts than expected. The default settings in the Renogy controller for lithium is 14.4 volts , boost volts, there is no float stage. It can be set for different system voltage, so ensure it's set for your 12v system.
As suggested by Mattb, lower charging voltages with new Litime batteries is advised. Suggest you start with GEL settings with a user adjustment for boost volts to 13.8 volts. This will give a value of 13.8 volts to both boost and float.
General comments.
The cable size in the picture seems too small for a 12v 3000/6000 inverter.
Can your batteries deliver the 300 amps needed for the inverter?
Previous posts identified battery over overvolts with the same controller and damaged occured to various parts of the system, also with a too high array voltage.
Have these problems been fixed?

The cable size is 1/0 copper cable. I purchased the cable from Windy Nation. According to the Windy Nation chart, 1/0 cable is good up to 285 amps. I scraped the Bronco stuff. Everything is new including the charge controller and the inverter. I did use the existing panels. I am using 5 panels wired in series. 5 - 200w panels. Like I said, the new system works fine other than when it's charges to 100%.