Wiring the Sunny Boy Wiring the DC Input
SB3000US-4000US-11-SE1607 SMA America 5-23
3. Connect the positive DC wire to the terminal labeled PV RETURN in the SMA
DC-Disconnect.
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 white wire (PV RETURN) to the terminal labeled DC+ in the Sunny
Boy.
5. Connect the black wire (PV HOT) 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.
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