HighTechLab
AKA Dexter - CTO of Current Connected, LLC
- Joined
- Sep 23, 2019
- Messages
- 1,693
@HighTechLab HighTechLab @HighTechLab (hopefully you see this reply)
It is not pretty but it has been working until I decided to program the EG4-LL batteries’ firmware with the Victron option and connect the batteries to Cerbo-GX using a CAN-bus cable (instead of continuing to use the Victron SmartShunt as my "Battery Monitor"). I am now getting “high voltage alarm: warning” (side effect of having battery communication, LOL) which clear themselves within few seconds, when SOC gets to 100%. I have lowered the bulk voltage from 56.8 to 55 volts and that didn’t help. I have a voltmeter on battery terminals and the voltage doesn’t go above 55 volts. However, there must be a problem with how the batteries talk to each other. It seems, one battery gets charged faster and enters the OV protection mode at 54.2 volts while the other two are still charging, which results to individual cell voltage un-balancing (about 0.3 volts instead of 0.02 normally). Of course, all warnings go away, individual cells voltages become within 0.02 volt as soon as they start to discharge by having some load on them. Please let me know if you have any suggestion. I plan to remove the CAN-bus cable and use the BMS-TOOLS software to see if they will be behaving same as having the CAN-bus cable. I recall noticing the OV protection mode when I didn’t even have the jumper cables between the batteries themselves (and no CAN-bus cable) in the beginning. I have a feeling that is normal and that is how they work.
Alarm logs for TinyHouse
Device Triggered by Description Started at Cleared after Battery Monitor [512] Automatic monitoring High voltage alarm: Warning 2023-02-24 14:46:54 7s Battery Monitor [512] Automatic monitoring High voltage alarm: Warning 2023-02-24 14:46:47 4s Battery Monitor [512] Automatic monitoring High voltage alarm: Warning 2023-02-24 14:46:44 Battery Monitor [512] Automatic monitoring High voltage alarm: Warning 2023-02-24 14:46:35 4s Battery Monitor [512] Automatic monitoring High voltage alarm: Warning 2023-02-24 14:46:30 1s Battery Monitor [512] Automatic monitoring High voltage alarm: Warning 2023-02-24 14:45:09 Battery Monitor [512] Automatic monitoring High voltage alarm: Warning 2023-02-24 14:43:44 1s Battery Monitor [512] Automatic monitoring High voltage alarm: Warning 2023-02-24 14:43:31 1s
Quote from Victron:
The ‘high voltage’ warning or alarm is not unusual on new batteries that are not yet balanced. To help the batteries balance quickly, keep the batteries fully charged until the errors go away. In an ESS system, set it to ‘keep batteries charged’, in an off-grid system the fastest way is to either charge / balance the battery before installation, or to fully charge with a generator if not enough solar is available to keep the batteries fully charged.
If you are unable to maintain the target voltage to balance the batteries without the ‘high voltage’ alarm occurring, you may need to enable and set the “Limit managed battery charge voltage” setting in the DVCC menu of the GX device. Reduce this voltage as necessary until the alarm stops. After sufficient time to balance the batteries, try increasing this value until it can be disabled again for normal operation.