The problem for me with the USB to RS485 is the need to have CPU with USB support close to the inverter. I think, if I was to do this, I would be more likely to use ethernet to RS485. May be
USR-TCP232-306 Serial to Ethernet Converter Lan Ethernet TCP/IP to RS232 RS485 RS422 Converter
or
Waveshare RS232/485/422 to RJ45 Ethernet Module, TCP/IP to Serial, with POE Function, Bi-directional Transparent Transmission, Suitable for Data Acquisition, Intelligent Instrument Monitoring
or
Waveshare RS485 to Ethernet Converter
Anyone have any experience with these devices?
I have completed the initial implementation of the SunSynk Connect Binding: