SMA America, LLC
Electrical Connection
Technical Description
SI5048U-TUS121440
41
6.1 Grounding
WARNING
Risk of lethal electric shock.
• Fuse the sub‑distribution of the generator or the power distribution 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 70 A.
WARNING
Risk of lethal 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
components of the stand‑alone grid to a grounded grid.
• Take the
National Electrical Code®
, ANSI/NFPA 70, and all locally applicable
standards and regulations into consideration.
External grounding of the negative pole of the battery
External grounding of the negative pole 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 protective 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 pole of the battery is necessary, assemble this outside of
the Sunny Island.
