SMA SUNNY ISLAND 4.4M Operating Manual page 75

SMA Solar Technology AG
The longer the days become, the more the SlfCsmp range increases automatically and the range for protection against
deep discharge (BatRes) decreases. The range for increased self-consumption reaches its maximum on the longest day.
This results in the seasonal progression of the ranges.
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
A
Self-consumption range (SlfCsmp)
The SlfCsmp range applies to the shortest day of the
year with seasonal adjustment (see Section 7.6.4.1,
page 74). When seasonal adjustment is deactivated,
only the SlfCsmp range is used and the BatRes range
increased accordingly.
Battery > Ranges of application > Minimum width
of backup power range
B
State of charge conservation range (PVRes)
The range size is constant year-round.
Battery > Ranges of application > Width of the
range for conserving battery state of charge
6)
This range can be adjusted for all battery types.
Operating manual
A
B
C
D
Summer
(Winter)
Behavior of the Sunny Island inverter
6)
The Sunny Island uses the battery for in-
creased self-consumption.
Excess PV energy is used for conserving the
battery charge. If no excess PV energy is
available, the Sunny Island switches to en-
ergy saving mode. When the state of charge
reaches the BatRes range limit, the Sunny Is-
land charges the battery up to half of the
PVRes range from the utility grid. To do so,
the Sunny Island charges the battery with
maximum efficiency at 25% of the nominal
power of the Sunny Island inverter.
7 Commissioning
Winter
(Summer)
SI44M-80H-13-BE-en-15
t
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