MeDat

If you are operating the battery within the parameters specified by the manufacturer and you are having issues then that is cause for a warantee replacement. It is important for you to decide if you want to keep it and find a reasonable compromise OR return it and demand your replacement. If you decide to keep it, then I strongly advise not to stress the battery unnecessarily because you already know what the problem is. You have discovered that a lower charge voltage helps and this is not a terrible thing because 52ish volts is still above the flat portion of the charge curve so you can achieve full charge with some more "absorption" and cell balancing along the way. The only time module position is relevant... New module with updated firmware = master battery in stack So telling you to swap batteries around in the stack IS NO HELP AT ALL for your problem.

I will look over the new data and let you know...

No matter how I twist and turn the data it all comes back to the same result...your batteries are operating as intended (based on the supplied info). There are a few "ghost in the walls" with bat 2 and bat 3 starting to balance with no clear reason. But this is not a cause for concern because small balance current + large charge current = no real balance taking place. When I got my batteries I used a power supply and set 52.5V charge voltage and left them until the charge current fell to 0.0A. This took a few hours (because they were new). Then I added them to the stack. The battery settings tells you what is ok and what is not, so if something happens outside of that scope record it share it and we will work with you on a solution.

We are making progress!!! This is a wealth of info to use to get better acquainted with your battery... I think there is no need to jump to CODE RED at this time. Give me some time to look over the info and share what your battery is doing and hopefully why.

I want to help you have better control over your battery so that it does what you want it to do. This starts by knowing what your battery settings are. For example, my battery balance start voltage is 3.36V per cell which is too early for me. With a target of 3.5V per cell charge it started to discharge both the high cells and the low cells which made my 75mV delta V into 200mV in a matter of days. So I had to reduce my charge voltage closer to the balance voltage to correct this (which also took days). When delta V was 20mV I returned to the previous 3.5V charge per cell. So lets get to know your battery... config = battery settings bat = battery status including which cell is in balance mode This info will help to customize a fix for the battery BTW nothing meaningful (re balancing) can happen in the flat part of the curve so it is ok to use your batteries at night.

You don't need to use the grid solar only is just fine.

That is why we try to help each other get pass those stressful moments.🙂 Pylontech datasheet recommends charging voltages between 52.5V and 53.5V. A charge voltage of 54V is outside the recommendations and the battery logs info in its history which pylontech often requires. We don't want them thinking you assisted in the battery's demise. Lets look back at basic principles... Current will flow if there is a potential difference (ie difference in voltage). The greater the voltage difference the greater the current flow. If the charge voltage per cell is much higher than the balance voltage per cell then the current will be too large for the balance FETs to handle (eg. a 100mA balance current cannot win against a 50A charge current). So for good balancing to take place you need two things... 1) The battery needs to be outside the flat portion of the charge curve 2) A low charge current so that the balance FETs can do their work All this will happen automatically once you set the appropriate charge voltage (ie between 50mV to 100mV above the balance start voltage per cell x 15) then just relax and watch science do its thing.

Battery BMS and inverters are complex systems, so I agree with @Tinbum If you are concerned then you should go back to Pylontech. HOWEVER, if you break down these complex systems into basic principles of operation then they seem not so complex, so lets try and do that. The balance current of the battery is very small in comparison to the charge current, therfore, lets allow for balancing to take place when the charge current is also small. This will happen when the charge voltage and battery voltage are almost equal. So set charge voltage to 52.5V ( 52.5 / 15 = 3.5V per cell...SAFE VALUE!!!) and if balance starts at 3.45V then delta V is only 0.05V. Now the charge current will be small enough for the balance current to make a difference and cell voltage will be within safe limits for hours of balancing per day until battery cells are equalized. This will take days because balance current is small. As I said before you can know the balance start voltage with "config" command in console window and which cells are balancing with "bat" command

You can be sure what voltage your battery starts balancing at by using a terminal software like putty OR the console window in Batteryview (with Admin login of course) and type "config" at the command line. This will show all the current settings in your battery. BTW what version of Batteryview do you have?

Lots of thanks to you Youda and everyone else for the wealth of knowledge found in this thread. I wish I had this info when I started my journey with the pylontech batteries. Still not where I would like to be yet, but i want to gather all the relevant details before I ask for help. The info so far has taken me several steps closer, thanks again. By the way the goal is H48050s in parallel not series.