Wiring the Sunny Boy Wiring the DC Input
5-20 SMA America SB3000US-4000US-11-SE1607
5. Pull the DC wires from the external DC disconnect through the conduit into the
interior of the Sunny Boy.
6. Connect the positive DC wire to the terminal labeled DC+ in the Sunny Boy.
7. Connect the negative DC wire to the terminal labeled DC– in the Sunny Boy.
Note: The Sunny Boy has provisions for up to two PV strings.
The positive and negative terminal blocks each have two
positions, so two 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.
8. Connect the positive and negative DC wires to the appropriate terminals in the
external DC disconnect enclosure.
9. Connect the DC equipment ground wire to the PE terminal
labeled in the Sunny Boy.
10. Torque all AC and DC wires in the Sunny Boy to 15 in-lb (1.7 Nm).
11. Verify that all connections are correctly wired and properly torqued.
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