Grounding - SMA Sunny Island 5048 Installation Instructions Manual

Electrical Connection
Detailed installation descriptions of the connections are provided in the following
sections:
• Grounding (section 6.1)
• DC connection (section 6.2)
• AC connection (section 6.3)
• Battery temperature sensor (section 6.4.1)
• Battery current sensor (section 6.4.2)
• Communication for multi-device connection (section 6.4.3)
• Multi-function relay 1 and 2 (section 6.4.4)
• External communication (section 6.5)
• GenMan connection (section 6.6)

6.1 Grounding

In stand-alone configurations, the (protective) ground of the Sunny Island 5048
and its individual components must be wired as a TN grid only. All valid standards
and guidelines must be taken into account!
Before commissioning the Sunny Island 5048, it must be externally
grounded according to the relevant regulations.
To allow different types of grounding, the N connection of the Sunny
Island 5048 is NOT connected to PE at the factory. However, since a
connection between N and PE is required for correct operation, this must
be done outside of the device.
Due to filter measures in the device, increased leakage currents against PE
can always occur. For this reason, a "fixed connection" of ground must be
implemented according to EN 50178. Ground the device with a copper
conductor (at least 10 mm² cross-section), or with two separate copper
conductors with a cross-section of at least 4 mm² each.
External grounding of the plus or negative pole of the batteries is possible because
the batteries and the grid side are galvanically isolated within the Sunny Island
5048. In this case, make sure that the high currents that may occur under fault
conditions can be adequately discharged.
If a connection is required, then this must be made by an installer.
The DC grounding conductors must be connected to the connection labeled "Ground".
Installation of the grounding conductors occurs in four steps:
Page 34 SI5048-11:EE4206
SMA
Technologie AG
Technical Description