MartinJoaquim,

It's just normal. Always like that 😉 Had to build a separate room for it 😉

Hello everyone, I am impressed by the scope of this forum. So I really hope to find help here. I am not a layman and have installed dozens of island photovoltaic systems. However, always with components from Victron Energy. Meanwhile, I wish I'd never touched that Axpert junk.... I know my problem is unfortunately well known, but I have done and checked everything suggested here and elsewhere. Yet I can't get my Pylontech batteries to communicate with the Axpert. I will describe the setting and my attempts in detail here: I have an Axpert 7200-48. Everything is wired correctly. I also have two US3000C. Everything is wired correctly, I think. I have checked the data cable: Inverter -> Master battery 3 -> 8 5 -> 7 Everything else is unconnected. DIP: Master battery 1 ON, 2,3&4 OFF Slave: all OFF (I have also tried various other settings, restarted the batteries properly each time, no difference) Batteries recognise each other correctly On the instructions of my supplier, I have also shut down the system completely several times, disconnected the solar, connected the battery only, restarted, everything is the same. Programme 5 was of course on PYL, but I also tried LIC. Everything always remains the same: after 1-3 minutes, 61 appears, the batteries are discharged but not charged, the system switches off at the inverter after 10 minutes. I even managed to get the WatchTower WLAN to work, but that doesn't help either. The only thing I haven't been able to do is update the firmware. I have U2 112 14. The inverter is from 03/22. So my questions: 1. is there any other source of error that I have overlooked? 2. does only the firmware update help and if so, what should I update to, where can I get it and what is the easiest way? 3. since I changed to USE in programme 5 in my distress, my settings are: Bulk Charging Voltage: 53.2V Float Charging Voltage: 51.8V Low DC cut-off Voltage: 47.8V Is this correct and/or do I have to change other parameters? Thank you for the effort and help! Swarm intelligence show what you can do! Thanks Martin