Wiring the Sunny Boy Wiring the DC Input
5-22 SMA America SB3000US-4000US-11-SE1607
Note: The SMA DC-Disconnect has provisions for up to four
PV strings. The PV HOT and PV RETURN terminal block each
has four positions, so four pairs of DC-input wires can be
connected in parallel.
CAUTION: Avoid using wire nuts to join any wires together
or to make any connections anywhere in the PV system. Wire
nuts are a frequent cause of unreliable connections, resistive
connections, and ground faults.
4. Connect the black wire (PV HOT) to the terminal labeled DC+ in the Sunny
Boy.
5. Connect the white wire (PV RETURN) to the terminal labeled DC- in the Sunny
Boy.
6. Torque all wires to 15 in-lb (1.7 Nm).
7. Verify that all connections are correctly wired and properly torqued.
Positive Grounding
Figure 5-12 DC Connection with positive grounding
1. Pull the DC wires from the PV array through the conduit into the interior of the
SMA DC-Disconnect.
2. Connect the negative DC wire to the terminal labeled PV HOT in the SMA DC-
Disconnect.
Negative DC
wire connected
to PV HOT
Positive DC
wire connected
to PV RETURN
White wire (PV RETURN)
connected to DC+
Black wire (PV HOT)
connected to DC-
To Next Page
Loading...
