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SMA Solar Technology AG
Electrical Connection
8.3 Connection of the Solar Modules
Do not connect the solar modules until the optional communication cables have been connected
(see section 7 "Connecting Optional Communication Devices" (Page 40)). DC distribution boxes
must be installed between the solar modules and the Sunny Central, where the solar module cables
are gathered and led to the Sunny Central. There must be breakers in the distribution boxes which
allow the disconnection of the DC side.
The solar modules are negatively-grounded by the Sunny Central. The Photovoltaic System
Grounding must be installed per the requirements of Sections 690.41 through 690.47 of the
National Electrical Code, ANSI/NFPA 70 and is the responsibility of the installer.
DANGER!
Voltage is present in solar modules exposed to light.
Death resulting from electric shock.
•
Cover the solar modules.
•
Switch off the fuses in the DC distribution boxes (e.g. Sunny String Monitor) and
secure them against reconnection.
•
Follow all safety precautions of the module manufacturer.
DANGER!
Normally grounded conductors may be ungrounded and energized when a ground-fault
is indicated.
Risk of electric shock.
•
Test before touching.
•
Work on the Sunny Central must be carried out by qualified personnel.
Technical Data for the Connection of the Solar Modules
Number of strings:
4 (8) or 6 (12)
DC input voltage:
300 - 600 V DC
Max. DC current:
800 A
Installation Guide
SC250U-IUS084912
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