SMA METER BOX FOR SUNNY BACKUP - Manual (Page 24)

6 Electrical Connection SMA Solar Technology AG
24 METERBOXSBU-IA-en-40 Installation Manual
6.4 Connecting the Communication
Requirement:
☐ The cable route for the communication cables between the Meter Box, the Sunny Backup and
the Automatic Switch Box is at maximum 20 m.
Figure12: Connecting the Meter Box to the Sunny Backup and the Automatic Switch Box (example)
Figure13: Connecting the Meter Box at the end of the cable route (example)
There are 2 possible system configurations:
• The Meter Box is located between the Automatic Switch Box and Sunny Backup.
• The Meter Box is located at the end of the cable route.
Risk of lethal electric shock
When working on the Sunny Backup system, lethal electrical voltages may occur.
• Before working on the Sunny Backup, switch it off (see technical description of the
Sunny Backup system).
• Disconnect the Sunny Backup and the Automatic Switch Box from the power supply
(see technical description of the Sunny Backup system).