Tinbum

You need to find out why this has happened, before the other battery goes the same way.. Give details of your setup.

I thought that they would reject it. You really need to try to file a claim against the inverter company.

Read the manual (US2000C or US5000) for the order to put them in- it's all in their.

Put the the newest as master.

Download the manual for the US5000 batteries and it will show you what order to place them in. I would think you shouldn't need a hub

What year / age US5000?

Yes, I think this is an inverter fault that has caused the battery problems. I would probably ask the installer to confirm the settings are ok and get them to actually measure the voltage coming out of the inverter when the inverter thinks it is at 53.2v. It's a pity you dont seem to have the log files for the batteries from initial installation date. I would check that again in battery view.

I'm pretty certain they will throw it out due to over voltage. What about the installer? I'm in the UK so no.

I would try that first and if they aren't helpful then go to Pylontech themselves. Did you register for the extended warranty?

Your chances are good as long as the battery hasn't gone overvoltage ie above 54v. How old is it though?

The battery will record logs all the time, you just need to download them with BatteyView. I suspect you have a cell in that battery that is going over voltage very easily/quickly. The battery disconnects from the bus (inverter/other batteries). The bms then re-balances the cell, the battery connects again, probably cell goes over voltage again and cycle continues until all cells are balanced. That's when it then reaches 100% SOC. Serial number erased just as a security measure. I would expect you to be making a claim for a replacement as it's not normal behaviour. (Edit Cell 8 looks to be a bit different to the rest so it could actually be that that cell is always low causing the other cells to be higher). Was this the first battery you bought in your setup?

I would use battery view to pull the logs for the second battery and post here please. Redact serial number. I think the second battery is disconnecting due to high cell voltages. Looks as if it may have a bad cell. The balancer does seem to equalize it though eventually, but not normal behaviour.

To get back on thread how did it go?

Great, can you pull the cell high and low values and the current for the battery 2 at the same time as the voltages.

You know quite well I am referring to the advice of not using communication.