SMA SUNNY ISLAND 4.4M Operating Manual page 79

SMA Solar Technology AG
Range Explanation of the range and parameters
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
C Backup power range (BuRes)
The BURes range applies to the longest day of the year
with seasonal adjustment (see Section 7.6.4.1,
page 74). When seasonal adjustment is deactivated,
only the minimum range is used and the SlfCsmp range
increased accordingly.
Minimum width of backup power range
D
Deep discharge protection range (BatRes)
Range for protection against deep discharge. This range
can only be reached when the utility grid fails.
Battery > Ranges of application > Minimum width
of deep discharge protection range
E
Deep discharge range (ProtRes)
This range can only be reached when the utility grid fails.
Battery > Ranges of application > Lower lmt deep
disch. protect range prior shutdown
The following ranges result from the parameter default values:
Range
Shortest day
Self-consumption 65% to 100%
range
60% to 65%
State of charge
conservation range
15% to 60%
Backup power
range
12)
December 21 (northern hemisphere) or June 21 (southern hemisphere)
13)
June 21 (northern hemisphere) or December 21 (southern hemisphere)
Operating manual
11)
Lead-acid battery
12) 13)
Longest day
45% to 100%
40% to 45%
15% to 40%
Behavior of the Sunny Island inverter
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.
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 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, the
Sunny Island charges the battery with nomi-
nal 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.
Lithium-ion battery
12)
Shortest day Longest day
30% to 100% 28% to 100%
25% to 30% 23% to 28%
13% to 25% 13% to 23%
SI44M-80H-13-BE-en-15
7 Commissioning
13)
79