SMA Solar Technology AG
The Sunny Backup System S
Technical Description
SBU2200-TEN083320
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2 The Sunny Backup System S
2.1 Properties
The Sunny Backup System S consists of one Sunny Backup 2200 in combination with one Automatic
Switch Box S (AS-Box-S.1), one external Sunny Remote Control 1 (SRC-1) display and one external
BatFuse A.01 DC fuse. This system is specially designed for backup applications and enables, in
compliance with all standard requirements, continued operation of a grid-connected PV system in the
event of grid failure. Thus, this system does not replace the conventional Sunny Boy (PV inverter), but
is installed additionally. In the event of grid failure, the Sunny Backup System S first ensures safe
disconnection of the loads and the PV system from the public grid, and subsequently forms a stable
stand-alone grid, into which the Sunny Boy can then feed solar energy. The maximum period of
interruption for the loads is approximately 50 ms, which for most loads is equivalent to uninterrupted
operation.
The Sunny Backup System S is suitable for use in conjunction with the Sunny Boy PV inverters from
SMA Solar Technology AG. The Sunny Backup System S can be integrated into new PV system
installations, and can also be retrofitted onto existing PV systems.
Along with the Sunny Backup 2200 and the automatic switching device AS-Box-S.1, a battery is
necessary as a short-term storage device, for reliable operation. During grid failure, the battery has
the task of correcting the imbalance between generation and consumption. Whenever less energy is
being generated than consumed (e.g. at night), the battery is discharged. Whenever more energy is
being generated than consumed (e.g. during the day), the battery is charged.
PVfeed-in counter
Public grid
Power supply
counter
Automatic disconnection
device for PV systems
PV coupling relay
Automatic Switch Box S. 1
Sunny Backup System S
PV-system
Sunny Remote
Control
Sunny Backup 2200
BATFUSE A.01
Battery
Consumer
