SMA SI 4548-US - Manual (Page 41)

SMA America, LLC 6 Electrical Connection
Operating Manual SI4548-6048-US-BE-en-20 41
6.1 Grounding
Danger to life due to electric shock
• Fuse the sub-distribution of the generator or the utility grid at input AC2 of the Sunny Island
with an overcurrent protective device (Branch Circuit Protection).
• Ensure that the overcurrent protective device complies with the specifications of the National
Electrical Code
®
, ANSI/NFPA 70.
• Use an overcurrent protective device for a maximum of 70 A.
Danger to life from electric shock due to faulty grounding
To allow different types of grounding, the N connection of the Sunny Island 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.
• Before commissioning, connect the Sunny Island 4548-US/6048-US and all other devices of
the stand-alone grid to a grounded utility grid.
• Take the National Electrical Code
®
, ANSI/NFPA 70, and all locally applicable standards
and directives into consideration.
External grounding of the negative terminal of the battery
External grounding of the negative terminal of the batteries is possible because the batteries and
the grid side are galvanically insulated within the Sunny Island.
• Dimension the cross-section of the grounding conductor sufficiently. Thus, you are ensuring
that in the event of a fault the high currents occurring can be discharged with an external
grounding.
• If grounding of the negative terminal of the battery is necessary, assemble this outside of
the Sunny Island.