SMA SUNNY ISLAND 4.4M Operating Manual page 79

SMA Solar Technology AG
SOC
100 %
0 %
Winter
(Summer)
Figure 17: State of charge ranges of the battery according to the time of year (example)
Range Explanation of the range and parameters
BuRes Range for the battery backup system function
Battery > Areas of application > Minimum width of
backup power area
BatRes Range for protection against deep discharge
This range can only be reached when the utility grid fails.
Battery > Areas of application > Minimum width of
deep discharge protection area
ProtRes Range for protection in the event of deep discharge
This range can only be reached when the utility grid fails.
Battery > Areas of application > Lower lmt deep
disch. protect area prior shutdown
The following ranges result from the parameter default values:
Range Lead-acid battery
BuRes 15% to 100%
Operating Manual
Area BuRes
Area BatRes
Area ProtRes
Summer
(Winter)
Behavior of the Sunny Island inverter
The Sunny Island uses this range for supply-
ing the battery-backup grid when the utility
grid fails. When the utility grid is available
again, the battery is charged by the Sunny Is-
land with nominal power from the utility grid.
The Sunny Island switches into standby
mode. The Sunny Island starts up every two
hours and attempts to charge the battery with
PV energy. If the battery cannot be charged,
the Sunny Island switches back to standby
mode.
When the utility grid is available again, the
battery is charged by the Sunny Island with
nominal power from the utility grid.
When this range is reached, the Sunny Island
switches off in order to protect the battery.
When the utility grid is available again, the
system must be charged manually (see
Sunny Island operating manual).
Lithium-ion battery
13% to 100%
7 Commissioning
Winter
(Summer)
SI44M-80H-12-BE-en-10
t
79