SMA SC 500U Installation - Manual (Page 49)

SMA Solar Technology AG
Installation Guide SC500U-IUS093411 49
8.5 Connection of the PV Modules
8.5.1 Requirements
Do not connect the PV modules until the optional communication cables have been connected (see
section 7 "Connecting Optional Communication Devices" (page 38)). DC distribution boxes (e.g.
Sunny Central String-Monitor) must be installed between the PV modules and the Sunny Central,
where the PV module cables are gathered and led to the Sunny Central.
The Photovoltaic System Grounding must be installed per the requirements of Sections 690.41
through 690.47 of the National Electrical Code, ANSI/NFPA 70 and is the responsibility of the
installer.
Technical Data for the Connection of the PV Modules
Torques and Cable Sizes for DC+, DC– and PE
Copper conductors only - use solid, or stranded copper only.
The Sunny Central can be delivered with 6, 7, 8 or 9 DC fuses. Every fuse has a separate rail to which
1 or 2 DC strings can be connected. Below you find the cable sizes and torques for the connection
of the strings.
Number of strings 6 (12), 7 (14), 8 (16) or 9 (18)
DC input voltage 330 - 600 V DC
Max. DC current 1600 A
DC fuses Number of DC
Strings
Cable Size Torque max. DC fuse
rating
6 6 800 kcmil All 194 °F (90 °C) copper
wire, 55 ft-lbs (75 Nm)
tightening torque
450 A
12 350 kcmil
7 7 600 kcmil All 194 °F (90 °C) copper
wire, 55 ft-lbs (75 Nm)
tightening torque
400 A
14 300 kcmil
8 8 500 kcmil All 194 °F (90 °C) copper
wire, 55 ft-lbs (75 Nm)
tightening torque
350 A
16 4/0 AWG
9 9 400 kcmil All 194 °F (90 °C) copper
wire, 55 ft-lbs (75 Nm)
tightening torque
300 A
18 4/0 AWG