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Explanation
Fuse
Battery
Lead-acid battery
Lithium-ion battery
Utility grid
SMA Energy Meter
Off-grid system
Battery-backup system
Grid disconnection
Grounding device
1.5
Explanation of Used Terms
Term
SMA Energy System Home
Grounding device
Battery-backup system
Stand-alone grid
Off-grid system
Quick Reference Guide
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Explanation
In the SMA Energy System Home (storage system), the Sunny Island uses the
connected battery for the intermediate storage of excess PV energy for increased
self-consumption.
In the case of all-pole disconnection, the functional group grounding device is
part of the automatic transfer switch of the battery-backup system and enables
protection against indirect contact with live components. For this, the grounding
device connects the neutral conductor and the protective grounding in stand-
alone mode (neutral grounding).
In the event of grid failure, a battery-backup system supplies loads with energy
and a PV system disconnected from the utility grid with voltage.
Stand-alone grids are self-sufficient utility grids that are supplied with power from
different energy sources. The Sunny Island forms the stand-alone grid and regu-
lates the balance between the energy that is fed in and the energy that is used.
All components belonging to the stand-alone grid (e.g., Sunny Island)
1 Information on this Document
Explanation
PV inverter
PV array
Existing protective devices (e.g. in the
SMA Energy System Home)
AC loads
Generator
Existing house distribution board with
protective devices (e.g. in the battery-
backup system)
Grid-connection point with energy me-
ter of electric utility company
SMA Energy System Home
Grid disconnection with all-pole discon-
nection
Grid disconnection without all-pole dis-
connection
SI44M-60H-80H-13-IS-de-12
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