JohanS

Ok, removed the offending battery and the case is bulging - clearly damaged beyond repair. How is this possible? I thought the Pylontechs have built-in management systems that prevents overcharging and excessive discharging? This battery has only done 1100 odd cycles when the manufacturer says they are good for at least 5000 cycles

Thanks, will try that. Batteries are about 4 years and 1000 odd cycles old. I did register for the extended warrantee but will have to check how long it is valid for.

Hi all I have a similar, but not identical, problem. 2 x 5kVA Axpert inverters with 8 x US3000 pylontech and 24 x 380W panels, managed by SMH software on a Raspberry Pi. Was all working fine until about a week ago. On investigation, 2 of the batteries were very low (6 and 4%) while the rest were working in unison at 35%. Battery stack showed an error. I reset the complete system. One of the batteries are now charging fine but it seems as if the one that was at 4% does not want to take charge. It actually starts discharging at 10% while the other batteries are still charging and at about 45%. Is the battery stuffed or is this just due to the mismath in SOC?