Wiring the Sunny Boy Wiring the DC Input
SB3000US-4000US-11-SE1607 SMA America 5-21
DC Wiring With SMA DC-Disconnect
Use the following procedure to connect the DC wires to the Sunny Boy with SMA
DC-Disconnect:
1. Verify that the AC breaker is OFF.
2. Install a 3/4-inch conduit fitting in the SMA DC-Disconnect’s DC wiring
knockout (the knockout on the left side of the SMA DC-Disconnect). Fasten the
conduit fitting on the inside of the SMA DC-Disconnect with the appropriate
locknut.
3. Install 3/4-inch conduit between the SMA DC-Disconnect and the PV array.
Negative Grounding
Figure 5-11 DC Connection with negative grounding
1. Pull the DC wires from the PV array through the conduit into the interior of the
SMA DC-Disconnect.
2. Connect the positive DC wire to the terminal labeled PV HOT in the SMA DC-
Disconnect.
3. Connect the negative DC wire to the terminal labeled PV RETURN in the SMA
DC-Disconnect.
Positive DC
wire connected
to PV HOT
Negative DC
wire connected
to PV RETURN
Black wire (PV HOT)
connected to DC+
White wire (PV RETURN)
connected to DC-
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