SMA America, LLC Electrical connection
Installation Guide SB30-40US-IUS103030 49
6.7.3 DC wiring without SMA DC Disconnect
1. Verify that the AC breaker is OFF.
2. Verify that the DC disconnect is open in the external DC disconnect enclosure.
3. Install a
3
⁄
4
in. conduit fitting in the DC wiring knockout of the inverter. Fasten the conduit fitting
on the inside of the inverter with the appropriate locknut.
4. Install a
3
⁄
4
in. conduit between the DC disconnect enclosure and the DC wiring knockout.
5. Refer to the following figure.
6. Pull the DC wires from the DC disconnect through the conduit into the interior of the Sunny Boy.
7. Connect the positive DC wire to the terminal labeled DC+ in the Sunny Boy.
8. Connect the negative DC wire to the terminal labeled DC − in the Sunny Boy.
9. Connect the positive and negative DC wires to the appropriate terminals in the external DC
disconnect enclosure.
10. Connect the DC equipment ground wire to the PE terminal labeled in the Sunny Boy.
11. Torque all AC and DC wires inside the Sunny Boy to 15 in-lbs. (1.7 Nm).
12. Verify that all connections are correctly wired and properly torqued. Pull on the cable in order
to make sure that it is sufficiently fixed in the terminal.
The Sunny Boy has provisions for up to 2 PV strings. The positive and negative terminal
blocks each have two positions, so two pairs of DC-input wires can be connected in
parallel.
Positive DC wire
connected to DC+
Negative DC wire
connected to DC −
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