Wiring the Sunny Boy Wiring the DC Input
SB3000US-4000US-11-SE1607 SMA America 5-15
DC Connection Requirements
WARNING: All electrical installations must be done
in accordance with all local electrical codes and
with the National Electrical Code (NEC), ANSI/
NFPA 70. For installation in Canada the installa-
tions must be done in accordance with applicable
Canadian standards.
WARNING: Use #10 AWG to # 6 AWG, 90 °C
(194 °F), copper wire for all DC wiring connections
to the Sunny Boy. Voltage drop an other consider-
ations may dictate that larger size wires be used.
Use only solid or stranded wire but not fine strand-
ed wire.
WARNING: The external DC disconnect for the in-
verter must have a minimum rating of 600 VDC and
30 A continuous. The SMA DC-Disconnect is shipped
with four 15 A, 600 Vdc fuses (one for each string).
See "Exchanging the PV String Fuses within the
SMA DC-Disconnect" on page 9-5 for details.
Note: Use the online SMA string size calculator at
www.sma-america.com to determine the correct string
configuration (see Figure 5-7). To navigate to the string size
calculator, click on the shortcut on the home page.
Note: Series fusing may be required depending on the type
of PV module used in the system. See NEC 690.9.
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