SMA SUNNY ISLAND 4.4M Operating Manual page 86

7 Commissioning
Range Explanation of the range and parameters
PVRes Range for maintaining the state of charge of the battery
The range size is constant year-round.
Battery > Areas of application > Area width for
conserving battery state of charge
BuRes Range for the battery backup system function
The BURes range applies to the longest day of the year
with seasonal adjustment (see Section 7.6.4.1,
page 80). When seasonal adjustment is deactivated,
only the minimum range is used and the SlfCsmp range
increased accordingly.
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
Range
Shortest day*
SlfCsmp 65% to 100%
PVRes 60% to 65%
BURes 15% to 60%
BatRes 10% to 15%
ProtRes 0% to 10%
* December 21 (northern hemisphere) or June 21 (southern hemisphere)
** June 21 (northern hemisphere) or December 21 (southern hemisphere)
86 SI44M-80H-12-BE-en-10
Lead-acid battery
Longest day**
40% to 100%
40% to 45%
15% to 40%
10% to 15%
0% to 10%
SMA Solar Technology AG
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 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, 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 (see
Sunny Island operating manual).
Lithium-ion battery
Shortest day* Longest day**
30% to 100% 28% to 100%
25% to 30% 23% to 28%
13% to 25% 13% to 23%
3% to 13% 3% to 13%
0% to 3% 0% to 3%
Operating Manual