Electrical connection SMA America, LLC
56 SB30-40US-IUS103030 Installation Guide
Positive grounding
3. Torque all wires in the terminal blocks inside the SMA DC Disconnect to 15 in-lbs. (1.7 Nm).
6.8 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 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 communication device is shown in the respective manuals.
1. Connect the negative DC wire to the terminal labeled
COMBINED in the SMA DC Disconnect.
2. Connect the positive DC wire to the terminal labeled PV
GROUNDED in the SMA DC Disconnect.
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