Technical Data
SMA Solar Technology AG
78
SSMUS-TUS094511
Technical Description
13.1 Torques and Cable sizes
Use 90 °C (194 °F), copper wire for all DC wiring connections to the screw terminals between
• PV-modules and Sunny Central String Monitor
• Sunny Central String-Monitor and Sunny Central
Use 90 °C (194 °F) copper wire for all DC wiring connections to the fuse holders.
13.1.1 Negative Grounding
PV module connections
Connection - Sunny Central
13.1.2 Positive grounding
PV module connections
Cables of the PV modules
Cable Size
Torque
DC+
Rigid wire: 10 - 6 AWG
Multistrand wire: 10 - 8 AWG
19.5 in-lb (2.2 Nm)
DC–
6 - 4 AWG
45 in-lb (5 Nm)
8 AWG
40 in-lb (4.5 Nm)
10 AWG
35 in-lb (4 Nm)
Ground
6 - 4 AWG
45 in-lb (5 Nm)
8 AWG
40 in-lb (4.5 Nm)
10 AWG
35 in-lb (4 Nm)
Cables to the Sunny Central
Cable Size
Torque
DC+
350 kcmil
325 in-lb
DC–
350 kcmil
325 in-lb
Ground
350 kcmil
325 in-lb
Cables of the PV modules
Cable Size
Torque
DC+
6 - 4 AWG
45 in-lb (5 Nm)
8 AWG
40 in-lb (4.5 Nm)
10 AWG
35 in-lb (4 Nm)
DC–
Rigid wire: 10 - 6 AWG
Multistrand wire: 10 - 8 AWG
19.5 in-lb (2.2 Nm)
Ground
6 - 4 AWG
45 in-lb (5 Nm)
8 AWG
40 in-lb (4.5 Nm)
10 AWG
35 in-lb (4 Nm)
