Connecting Pv Modules - Negative Grounding - SMA SUNNY CENTRAL STRING-MONITOR US Technical Description

SMA Solar Technology AG
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.
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.
Technical Data for the Connection of the PV Modules
Max. number of strings
Max. string short-circuit
current
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.
Cables of PV Modules
DC +
DC -
Technical Description
Version 24
24
12.82 A
Cable Size
Rigid wire: 10 - 6 AWG
Multistrand wire: 10 - 8 AWG
6 - 4 AWG
8 AWG
10 AWG
Version 32
32
9.62 A
19 in-lb (2.2 Nm)
45 in-lb (5 Nm)
40 in-lb (4.5 Nm)
35 in-lb (4 Nm)
SSMUS-TUS094511
Electrical Connection
Version 64
64
5.13 A
Torque
41