Wiring the Sunny Boy Wiring the DC Input
5-18 SMA America SB3000US-4000US-11-SE1607
Connecting the DC Wires
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 ex-
posed to light. Use safe working practices when
working on PV arrays.
WARNING: Always turn OFF all AC and DC break-
ers and switches in the PV system and wait a mini-
mum 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 volt-
age from the PV strings before you connect the DC wires
to the Sunny Boy. Applying an open-circuit DC-input volt-
age that exceeds the maximum DC-input-voltage range
will cause irreversible damage to the Sunny Boy and void
the warranty! Always verify the DC voltage before con-
necting the DC-input wires from the PV array to the Sunny
Boy. (See the online SMA string size calculator at
www.sma-america.com to determine the correct string
configuration as shown in Figure 5-7.)
Check both the polarity and
the open-circuit voltage from
the PV strings!
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