SMA Solar Technology AG
Electrical Connection
Technical Description
SSMUS-TUS094511
41
7.3 Connecting PV modules - negative grounding
The PV modules may not be connected until the communication cables have been connected (see
section 6 "Communication connector" (page 29)).
The Photovoltaic System Grounding shall 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. In Canada, wiring methods shall be per the Canadian Electrical Code Part II.
Technical Data for the Connection of the PV Modules
Technical Data for the Cables of the PV Modules
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.
DANGER
Risk of electric shock when touching the DC cable attached to the PV module.
Death or serious injuries.
Voltage is present in PV modules exposed to light.
• Cover the PV modules.
• Follow all safety precautions of the module manufacturer.
Version 24
Version 32
Version 64
Max. number of strings
24
32
64
Max. string short-circuit
current
12.82 A
9.62 A
5.13 A
Cables of PV Modules
Cable Size
Torque
DC +
Rigid wire: 10 - 6 AWG
Multistrand wire: 10 - 8 AWG
19 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)
