RS485 protocol for (solar) inverters

The RS485 is a serial protocol for communication between digital devices. Solar inverter manufacturers often use this protocol let their inverters communicate with the outside world.

The RS485 protocol has, for (solar) inverters, a couple of advantages against RS232:

  • works over a big distance (till 1200 metres (4000 feet))
  • supports a maximum of 32 – 256 devices, which makes possible to communicate with a 32-256 inverters on a bus.


These are the 2 biggest advantages and make it possible to connect a big number of inverters on a bus and let them communicate over a big distance.

To let WebSolarLog gather data from the inverter, it needs a RS485<>USB converter. The converter makes it possible to read the data from the inverter.

If you have any questions, suggestions or what so ever regarding this post, feel free to post on our google support forum: