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Sunny Island
3.6 Interfaces for Communication
The Sunny Island has a total of three interfaces. These interfaces make it extremely
easy to configure and operate the Sunny Island.
COM1 (SYNC BUS) is an RS485 interface e. g. for data exchange between the sys-
tem management processors of several Sunny Islands in three-phase operation. A
synchronization signal ensures phase synchronization in three-phase operation. This
signal is exchanged among the control processors of the individual Sunny Islands.
As it is transmitted in one cable together with the RS485 signal, a special cable set
(SMA order name "SI-Synckabel-Set") is required for three-phase operation.
The COM2 interface can be equipped to comply with different electrical standards
such as RS232 or RS485 by plugging on a Piggy-Back. Via this interface parameters
can be set or modified with a PC or Sunny Boy Control. If Sunny Boy String Inverters
are used in the island grid defined power control of the Sunny Boys is possible via
this interface as well. This is especially important for optimum battery management
(e. g. for full charging, compare chapter 11). With a PC and the software package
Sunny Data which is available as an accessory (SMA order name "SWR-DA") it is
possible to diagnose and record data of all SMA components (Sunny Boy and Sunny
Island) connected to this interface.
BWRI33-12:EE
SERVICE/COM3
COM2
Fig. 3.18: Interfaces of the Sunny Island
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Installation & Operating Instructions
SYNC BUS
SYNC BUS
86-00744
SMA Regelsysteme GmbH
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