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Post: Hello Sebastian Are you using a shielded twisted pair cable to join the inverters together? It is possible that the RS485 Pi is more sensitive to noise than your USB device so a twisted cable will give you better noise performance. Maxim has a good article on [url=https://www.analog.com/en/resources/technical-articles/rs485-cable-specification-guide--maxim-integrated.html]wiring an RS485 network[/url] You could also try adding a 10K resistor between the Raspberry Pi’s 5V pin and the A output on the RS485 Pi and a second 10K between the ground and B output. This should make the RS485 Pi less susceptible to noise and hopefully solve the problems you are having.