Emonpi - multiple serial-usb

Can i get 2 (or more) inputs via a serial-usb connected to the emonPi?
Now i have one connected via the [RFM2Pi] in [intercaces] by changing the comport and baudrate.
I would like to connect 2nd arduino via serial.

Yes, you can use a USB serial device e.g. /dev/ttyUSB0 see emontx direct serial example for emonhub:

### This interfacer manages the EmonTx3 ESP format serial
     Type = EmonHubTx3eInterfacer
           com_port= /dev/ttyUSB0
           com_baud = 115200
           pubchannels = ToEmonCMS,