4 Product Overview
Operating Manual STPx0-3SE-40-BE-en-10 25
SMA Solar Technology AG
4.5 Battery Management
SOC
0 %
100 %
A
B
C
D
User SOC
Real SOC
Figure 3: State of charge ranges of the battery
Range Parameter Hybrid inverter behavior
A - The hybrid inverter uses the battery within
this range for increased self-consumption.
When more energy is needed than can be
supplied by the PV modules, the battery is
discharged.
B
Battery > Areas of application > Mini-
mum width of backup power area (Ba-
tUsDm.BckDmMin)
The value indicates the percentage of bat-
tery charge to be retained for battery-
backup operation. This battery charge can-
not be used in parallel grid operation, even
if the battery-backup operation is deacti-
vated.
C
Device > Self-consumption > Lower
battery discharge limit (BatChaSttMin)
In this range, the battery is no longer dis-
charged, even in battery-backup operation.
D
Battery > Areas of application > Mini-
mum width of deep discharge protec-
tion area (BatUsDm.DschProDmMin)
The value specifies which percentage of the
Real SoC is to be reserved as deep dis-
charge protection. This value corresponds
to a User SoC of 0%. When the state of
charge is displayed as 0% (User SOC), the
battery is actually (Real SOC) still charged
to as much percentage as this value indi-
cates.
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