pintopf

That sounds good, can you please patch the firmware for me? Are also improves in the newer software? Thank you, Peter

shit.😬 I take a screenshot from may app, so can you see all the numbers. Thank you! Greetings from Berlin!

Thank you for your answer. On my screenshot you can see the original serial number. The Android-App creates a second device with the new serial number. It's the same hardware with a new number. Sendig QBOOT receives only "NAK". I think, that the F9 error occurs, if only solarpower exists, without grid and battery power. Then is in the inverter no path to forward the energy in any direction. i can reproduce this situation at any time. With connected battery and/or grid, no error and the inverter works fine. Yes, the device is under warranty, but it's from italy and it's a long way to italy. I found the seriel number set program (AxpertSetTools), but i don't test it with the includet serial-number, because my inverter is under warranty. Error 90 with shutdown sounds not so good, yesterday i send a second mail to my supplier. It was unfortanely the one and only supplier for the Axpert VIII Twin 4kW in Europe. My hope was, than anybody can calculate for me the checksum for the AxpertSetTools, so that can i do this operation alone. The Axpert works fine, and with my ESP32 ->MQTT interface and the corresponding Node-Red program i can control him nearly perfectly. Greetings, Peter

Hello, i'am from Berlin / Germany and after some weeks of only reading this interesting forum, one question / problem occurs. I set up an off-grid solarsystem with the Axpert VMIII Twin because it has a wide mppt Range from 60 to 455 V. So i remain flexible with the solar-panels. An why 24V? According to the datasheet, the Twin 4kW/24V consumes "only" 40 Watts without load, the bigger 6kW/48V needs 55Watts. In my small system this ist probably better. And i need maximal 2000W. Now my story: In the last weeks i installed the Inverter "VM III TWIN 4k" + Pylontech Batteries + Solarpanels (2*455W,50V/9A). At Friday,18.3.2023, i put the system into function. Everything works fine. But in the night to monday,20.3.2023 shuts the Inverter down,after the battery capacity fell below the set value. The grid voltage to the inverter was switched off. So far everything seemed fine, the installed automatic transfer switch is switched to the "normal" grid. But this morning i went to the basement, where the system ist and (one relay? in )the axpert clicks regulary because the solar power is not yet sufficient for regular operation. Unfortanely the display shows error "F09". I looked it up on google and the power transistors were given as the cause of the error. However, the device did not generate any significant power and so this error seemed unlikely to me. I swiched the grid voltage to the inverter and the pylontech's on, so that der inverter has enouch energy to start up and luckily i found him in the WatchPower - App. In this app i restored the parameters to default and everything looks fine. Oddly enough, the serial number of the inverter ich changed to " 55355535553555" Is that a problem for me? Can i restore the old serial number? I contacted the dealer of this device, "Solarpower24.it", he is located in italy, but i didn't get any reply. I also build an Interface with an ESP32 to communicate with the inverter, but i found not the complete command set for this specific device. I used "wireshark" to read the communication between the Axpert (WIFI-Interface is inclusive) and the Android App, and extracted some commands. Thank you! Peter Thank you, Peter