SMA SI 5048, Technical Description

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Electrical Connection SMA Solar Technology AG
42 SI5048-TEN093630 Technical Description
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 Islands in
order to increase the overall power. The Sunny Island communicate with other via an RJ45 cable.
A black RJ45 cable is provided with each Sunny Island. You need the cable in order to establish an
(internal) communication between several Sunny Islands. The maximal total length of the
communication bus cannot 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 terminal area.
2. Feed the RJ45 cable from the outside through the plugs inside the Sunny Island master.
3. Remove the terminating resistor from the "ComSyncOut" socket of the master and plug it into the
"CompSyncIn" socket of the master.
4. Plug the RJ45 cable into the "ComSyncOut" socket.
5. Connect the Sunny Island master to the slave:
Number of Slaver Connection Procedure
1 slave • Take the RJ45 cable leading away from the master, introduce
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 slave are connected.
2 slaves • Take the RJ45 cable leading away from the master, introduce
it into the Sunny Island slave 1 and plug it into the "ComSyncIn"
socket there.
• Remove the terminating resistor from the "ComSyncOut" socket
in the Sunny Island slave 1.
• Plug the RJ45 cable included in the delivery into the
"ComSyncOut" socket of the slave 1.
• Tale the RJ45 cable leading away from the slave 1, introduce
it into the Sunny Island slave 2 and plug it into the "ComSyncIn"
socket there.
☑ The Sunny Island master and the slaves are connected.