SMA Solar Technology AG
38 SB50US-80US-IUS094030 Installation Guide
5.1 Sequence of Connecting
5.1.1 Wiring without SMA DC-Disconnect
1. De-energize all energy sources by opening all AC and DC disconnects and/or breakers.
2. Wiring from AC breaker to the AC disconnect switch.
3. Wiring from the AC disconnect switch to the Sunny Boy, follow the procedure on page 47 et
seq..
4. Wiring from the PV wires to the DC disconnect.
5. Wiring from the DC disconnect to the Sunny Boy, follow the procedure on page 58 et seq..
6. Turn the DC switches and/or breakers ON.
7. Turn the AC switches and/or breakers ON.
To disconnect the Sunny Boy first turn OFF all AC disconnects and then all DC disconnects. 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.
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