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tery state. The mostly dominant input variable which is most important for the calcu-
lation of the battery state is the charge degree (see Fig. 11.2). This mainly provides
information on the availability of the battery. In addition to the charge degree, how-
ever, other variables mainly concerning battery aging are also used for calculation.
These are e. g. the battery voltage during overcharging or exhaustive discharging,
but also the times after a full charge or an equalizing charge has first been re-
quested. The battery state therefore shows that either the availability of the energy
stored deteriorates considerably due to the decreasing charge degree or the battery
is in an area with increasing aging while its charge degree can still be high.
battery low
Battery Requires
Charging!
0 %
10 % 20 %
30 %
L4
L3
L2
L1
Deactivate all
Consumers
Deactivate
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Fig. 11.2: Dependency of the battery state on the charge degree and possible
BWRI33-12:EE
battery
normal
50 %
60 %
40 %
N4
N3
N2
Start Battery Charging
With Generator
Partially deactivate
Consumers
switching operations
Installation & Operating Instructions
battery
overloaded
100 %
N1
01
02
Deactivate Wind Power Plant
Activate
Dumpload
- 113 -
Range
State of Charge
03
Battery State
SMA Regelsysteme GmbH
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