SMA America, LLC
Wiring the Sunny Boy
Installation Guide
SB20_25_30HFUS-eng-IUS113711
43
6.3 Connection of the PV array (DC)
You can connect two PV strings directly to the terminal of the Sunny Boy. If you need to connect
3 PV strings, fuses as required by the
National Electrical Code
®
may be installed on the hat rail. For
additional information refer to section 6.5 ”Connection of PV strings with optional fuses” (page 50).
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 breakers and switches in the PV system and wait a minimum of
5 minutes, until the Sunny Boy is completely discharged and all LEDs are off, 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.
WARNING
Electric shock as a result of incorrect array grounding before installation of the
SMA Plug-in Grounding. Death or serious injuries.
The PV plant is only grounded when the inverter and the SMA Plug-in Grounding are
completely installed.
Leave the inverter disconnected on both the DC and AC sides until installation of the
inverter and the SMA Plug-in Grounding is completed.
WARNING
Verify that the DC current of your installation does not exceed the maximum values
specified in the type rating label.
