Interface For External Communication; Connection Of The Interface For External Communication - SMA SUNNY ISLAND 4548-US Operating Manual

6 Electrical Connection
4. Tighten the screws of the terminal (torque: 5 in-lb to 7 in-lb (0.56 Nm to 0.79 Nm)).
☑ The DigIn digital input is connected.

6.5 Interface for External Communication

You can connect SMA communication devices (e.g. Sunny WebBox) or a PC with the appropriate
software to a communication interface. You will find a detailed wiring diagram in the communication
device manual, the software or on the Internet at www.SMA-America.com.
You can incorporate an RS485 communication interface into the Sunny Island.
Powerline/Powerline modem (PLM)
Communication via Powerline (PLC) is not possible in off-grid systems.
Communication in a cluster
Fitting a communication interface in a cluster is only necessary on the master.

6.5.1 Connection of the Interface for External Communication

Destruction of the communication interface through electrostatic discharge
Internal components of the Sunny Island can be irreparably damaged by electrostatic discharge.
• Ground yourself before touching components.
Interface for external communication in battery-backup systems
If a battery-backup system. is connected to the Sunny Island, the RS485 communication
between the Sunny Island and the PV inverters is necessary For this, the following devices each
need one RS485 interface:
• the Sunny Island (if there are several Sunny Island inverters, the Sunny Island master)
• each PV inverter
62 SI4548-6048-US-BE-en-21
SMA Solar Technology America LLC
Operating Manual