SMA SI 3.0-11 Quick Reference Guide V.3.0 - Manual (Page 12)

3 Information and System Description SMA Solar Technology AG
12 Ersatzstrom-IS-en-30 Installation - Quick Reference Guide
3 Information and System Description
3.1 Requirements of the "VDE Forum Network Technology /
Network Operations (FNN)"
The information only applies for systems for which the following characteristics are all applicable:
• The system stores energy for increased self-consumption.
• Only one Sunny Island is connected in the system.
• The grid operator requires compliance with the Technical Information "Connection and Operation of Storage Units"
of the FNN. Currently, only the grid operators in Germany require compliance with the above-mentioned Technical
Information (status: June 2014).
In these systems, the Sunny Island must be connected to a line conductor supplied by a single-phase PV inverter. If there
are only three-phase PV inverters connected in the system, the Sunny Island can be connected to any line conductor.
The requirements of the Technical Information "Connection and Operation of Storage Units in Low-Voltage Networks"
published by the FNN influence the discharge behavior of the Sunny Island inverter. In systems with one Sunny Island
and single-phase PV inverters, the SMA Flexible Storage System reduces the maximum discharge power of the
Sunny Island inverter if necessary (for examples of correct connection of the PV inverters, see quick reference guide
"SMA Flexible Storage System").
3.2 System Information
Battery backup systems without increased self-consumption
If you are not increasing the self-consumption of PV energy, the following devices are not required:
• SMA Energy Meter
• Sunny Home Manager
• Speedwire data module Sunny Island
Information on batteries
Lithium-ion batteries in battery backup systems
In order to meet the requirements of battery backup systems in the event of grid failure, the Sunny Island has a high
overload capacity. The prerequisite for this overload capacity is that the battery is able to supply sufficient current.
With lithium-ion batteries, this ampacity cannot be taken for granted.
• Clarify with the battery manufacturer whether the battery is suitable for battery backup systems with
Sunny Island. Note especially the ampacity if, in the event of grid failure, the battery backup grid is supplied
by the Sunny Island.
Recommendations for battery capacity
SMA Solar Technology AG recommends the following minimum battery capacities. The battery capacities apply for
a ten-hour electric discharge (C10).
• Single-phase battery backup system with SI3.0M-11: 100 Ah
• Single-phase battery backup system with SI4.4M-11: 100 Ah
• Single-phase battery backup system with SI6.0H-11: 120 Ah
• Single-phase battery backup system with SI8.0H-11: 160 Ah
• Three-phase battery backup system with three SI3.0M-11: 300 Ah
• Three-phase battery backup system with three SI4.4M-11: 300 Ah
• Three-phase battery backup system with three SI6.0H-11: 360 Ah
• Three-phase battery backup system with three SI8.0H-11: 480 Ah
The minimum battery capacity must be observed to ensure stable operation of the system.