SMA Solar Technology AG
Installation Guide
SB50US-80US-IUS094030
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5.8 Connecting the DC Wires
Check both the polarity and the open-circuit voltage from the PV strings!
WARNING!
You must connect the wires that carry the DC voltage from the PV array to the Sunny Boy
in the order described in the following procedure. Deviating from this procedure could
expose you to lethal voltages that can cause serious injury and/or death.
WARNING!
PV arrays are energized when exposed to light. Use safe working practices when working
on PV arrays.
WARNING!
Always turn OFF all AC and DC breakers and switches in the PV system and wait a
minimum of 5 minutes for the Sunny Boy to completely discharge before connecting any
wires to the Sunny Boy or disconnecting any wires from the Sunny Boy. Failure to do so
could expose you to lethal voltages that can cause serious injury and/or death.
CAUTION!
Verify the polarity and the open-circuit voltage from the PV strings before you connect the
DC wires to the Sunny Boy. Applying an open-circuit DC-input voltage that exceeds the
maximum DC-input-voltage range will cause irreversible damage to the Sunny Boy and
void the warranty! Always configure the DC-input-voltage range correctly before
connecting the DC-input wires from the PV array to the Sunny Boy. Use the online SMA
string size calculator at www.sma-america.com to determine the correct string
configuration.
WARNING!
Verify that the DC current of your installation does not exceed the maximum values
specified in the type rating label.
