7 Commissioning
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
82
Ranges for battery use:
t
SOC
0 %
100 %
A
B
C
Winter
(Summer)
Summer
(Winter)
Winter
(Summer)
Figure 19: State of charge ranges of the battery according to the time of year (example)
Range
Explanation of the range and parameters
Behavior of the Sunny Island inverter
A
Backup power range (BuRes)
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.
Battery > Ranges of application > Minimum width
of backup power range
B
Deep discharge protection range (BatRes)
This range can only be reached when the utility grid fails.
The Sunny Island is switching to energy-sav-
ing mode. The Sunny Island starts up every 2
hours and attempts to charge the battery with
PV energy. If the battery cannot be charged,
the Sunny Island switches back to energy-sav-
ing mode.
When the utility grid is available again, the
battery is charged by the Sunny Island with
nominal power from the utility grid.
Battery > Ranges of application > Minimum width
of deep discharge protection range
C
Deep discharge range (ProtRes)
This range can only be reached when the utility grid fails.
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 Sec-
tion 13.6, page 131).
Battery > Ranges of application > Lower lmt deep
disch. protect range prior shutdown
(Limit between
BuRes and BatRes)
