A new installation with Multiplus 2, cerbo and MPPT getting always error 3
One of the multis came with an older firmeware, so I updated it with the “Flash-Programm”, after I connected all 3 multis with the udp cable and mk3 usb adapter to the laptop and configured the 3 phase system and did all the settings in the configuration tool.
Connected the 3 multis to the cerbo and did the update off all firmeware over the VRM Portal successfully, so for me means the bus is ok.
The endtermination are plugged in and they also have 120 Ohm. Checked the UDP cable with a networktester, also ok.
AC input and Batterie input also OK.
Connectet 4 old carbatteries in Serie for testing , the BYD is not delivered yet.
I also startet again from beginning, flash the software new to all multis with the “flash-tool” and configure again, but always the same.
Hope someone can help me.