Hello guys ,what causes this on pylontech us3000C

Overvoltage probably.

So what might be the best solution

check Solar Deity they are authorized PYLONTECH service

Best solution is to keep your charge voltage below 53v. But in my opinion, just stay away from Pylontechs, upgrade now. There is much better batteries out there and this is just my honest opinion after owning Pylontechs for five years. I wish I had known better back then

Your best having a look at the log files to see what voltages they have been subjected to.

Most problems with Pylontech tend to be due to bad setups and inverters that don't control voltage well.

Alright thanks