Wiring the Sunny Boy Communication Wiring
5-24 SMA America SB3000US-4000US-11-SE1607
Communication Wiring
Various data-communication options are available for the Sunny Boy. These options
are provided in the form of accessory Piggy-Back modules that can be installed and
connected either at the time the inverter is installed or at any time thereafter. These
modules are not included with the Sunny Boy. Please contact SMA America for
information. Refer to the instructions included with the communication module for
installation procedures.
The following subsections provide instructions for connecting the various
communication cables between a Sunny Boy with a communication module and a
personal computer (PC). The connection of a Sunny Boy to a Sunny Boy Control or
a Sunny Beam wireless monitoring unit is shown in those respective manuals.
RS-485 Communication
RS-485 is a communication standard for bidirectional transmission of data between
one or more Sunny Boy inverters and a PC.
Note: All Sunny Boy inverters are capable of RS-485
communication. You can mix different Sunny Boy models on
the RS-485 communication bus.
Requirements for RS-485 Communication:
• The Sunny Boy must be equipped with an RS-485 Piggy-Back communication module.
• The cable should be no longer than 1200 meters (4000 feet) with a common shield, and
a wire size no smaller than 24 AWG. Use the cable type specified in the RS-485 Tech
Note on www.sma-america.com.
• RS-485 cables are available from SMA America.
• Conduit may be required for communication wiring, per local electrical code require-
ments.
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