SMA Solar Technology AG
Installation Guide
SB50US-80US-IUS094030
39
5.1.2 Wiring with SMA DC-Disconnect
1. De-energize all energy sources by opening all AC and DC switch disconnects and/or breakers .
2. Wiring from the AC breaker to the SMA DC-Disconnect, follow the procedure on page 50 et
seq..
3. AC wiring from the SMA DC-Disconnect to the Sunny Boy, follow the procedure on page 50 et
seq..
4. Wiring from the PV array to the SMA DC-Disconnect, follow the procedure on page 60 et seq..
5. DC wiring from the SMA DC-Disconnect to the Sunny Boy, follow the procedure on page 60 et
seq..
6. Switch the SMA DC-Disconnect to the "1" position.
7. Turn the AC breaker ON.
To disconnect the Sunny Boy, first turn OFF all AC disconnects and turn the SMA DC-Disconnect to
the "0" position. The AC system should always be disconnected before the DC system. After the Sunny
Boy is de-energized, disconnect the wiring in the reverse order from above.
WARNING!
Always connect the wires to the Sunny Boy in the following sequence:
WARNING!
Always wait a minimum of 5 minutes for stored potentials in the Sunny Boy to discharge
completely before opening the enclosure.
WARNING!
All electrical installations must be done in accordance with all local electrical codes and
the National Electrical Code (NEC), ANSI/NFPA 70.
WARNING!
Before connecting the Sunny Boy to the electrical utility grid, contact the local utility
company. This connection must be made only by qualified personnel.
