SMA America, LLC
Wiring the Sunny Boy
Installation Guide
SB20_25_30HFUS-eng-IUS113711
45
Installing cable conduit and cable on the DC side
1. Turn the DC disconnect switch of the
SMA DC-Disconnect to position ”Off”.
2. Loosen the screws on the enclosure of the
SMA DC-Disconnect. Do not take the screws out of
the lid.
3. Remove the lid to the front.
4. Lay the lid to one side in such a way that it will not
become damaged.
☑ The SMA DC-Disconnect is open.
5. Push out the protective caps of the openings
through which the DC cables are to be lead from
the inside of the enclosure of the
SMA DC-Disconnect.
6. Install cable conduits (
3
⁄
4
in. (19 mm)) on the free
openings of the SMA DC-Disconnect. Screw the
cable conduits with counter nuts to the inner side of
the SMA DC-Disconnect.
7. Pull the cables of the PV strings and the cable of the
ground rod through the cable conduits.
☑ Cable conduits on the DC side are installed and the cables of the PV strings are lead into the
Sunny Boy.
Installing cable conduit and inserting cable on the AC side
1. Push out the protective caps of the openings through which the AC cables are to be lead from
the inside of the enclosure of the SMA DC-Disconnect.
2. Install cable conduits (
3
⁄
4
in. (19 mm)) on the free openings of the SMA DC-Disconnect.
Screw the cable conduits with counter nuts to the inner side of the SMA DC-Disconnect.
3. Lead the AC cable through the cable conduit from the inside of the safety enclosure into the
inside of the SMA DC-Disconnect.
☑ Cable conduits are installed and the cable for the AC connection are lead into the Sunny Boy.
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