SMA Sunny Island 5048 - Communication for Multi-Device Connection

SMA Solar Technology AG Electrical Connection
Technical Description SI5048-TB-TEN110340 43
6.4.3 Communication for Multi-device Connection
The Sunny Island can be connected in parallel or in a three-phase system with other Sunny Island in
order to increase the overall power. The Sunny Island inverters communicate with each other via an
RJ45 communication cable. A black RJ45 cable is provided with each Sunny Island. You need it in
order to establish an (internal) communication between several Sunny Island inverters. The
communication bus's maximum total length may not exceed 30 m. If you operate only one Sunny
Island in your system, the cable is not required.
Proceed as follows to implement the connection:
1. Remove one of the two plugs in the rubber connection area.
2. Lead the RJ45 cable from the outside through the plugs inside the Sunny Island master.
3. Remove the termination resistor plugged into the master's "ComSyncOut" socket and insert it in
the master's "ComSyncIn" socket.
4. Plug the RJ45 cable into the "ComSyncOut" socket.
5. Connect the Sunny Island master to the slave:
Commissioning the battery current sensor
When connecting a battery current sensor to the Sunny Island, the device's internal offset
must be adjusted during the first commissioning of the off-grid system. To do this, proceed
as described in section 8.3”Commissioning the Battery Current Sensor” (page60).
Number of slaves Connection procedure
1 Slave • Take the RJ45 cable coming from the master, insert it into the
Sunny Island slave and plug it into the "ComSyncIn" socket.
• Leave the termination resistor plugged into the "ComSyncOut"
socket.
☑ The Sunny Island master and Sunny Island slave are
connected.