4 Product Overview
SMA Solar Technology AG
Operating manual
SBSxx-10-BE-en-11
25
The frequency shift power control is enabled by default. No additional settings must be carried out.
It must be ensured that the connected PV inverters limit their power at the AC output via the battery
inverter due to changes in frequency. The frequency-dependent active power limitation P(f) must be
set in the PV inverter.
50
100
+4
+3
+2
+1
0
−1
−2
−3
−4
f Limit Delta (2 Hz)
f Start Delta (1 Hz)
f [Hz]
PA
C
[%]
f Delta− (4.5 Hz)
f Delta+ (4.5 Hz)
Figure 3: Impact of the frequency shift power control on the power output of a PV inverter
Designation
Explanation
f
Base frequency of the stand-alone grid
f Delta-
to
f Delta+
Maximum range in relation to the base frequency in which the PV inverter
is active.
f Start Delta
Frequency increase in relation to the base frequency, at which point the
power regulation via frequency begins.
f Limit Delta
Frequency increase in relation to the base frequency, at which point the
power regulation via frequency ends.
The power of the PV inverter at this point is 0 W.
4.4
LED Signals
LED signal
Explanation
The green LED is flashing
(two seconds on and
two seconds off)
Waiting for feed-in conditions
The conditions for feed-in operation are not yet met. As soon as the
conditions are met, the inverter will start feed-in operation.
The green LED is flashing
(1.5 s on and 0.5 s off)
Secure power supply operation or battery-backup function
The secure power supply operation or battery-backup function is ac-
tivated and the inverter supplies the loads with energy from the bat-
tery.
The green LED flashes
quickly
Update of central processing unit
The central processing unit of the inverter is being updated.
The green LED is glowing
Parallel grid operation
The green LED is off
The inverter is not feeding into the utility grid.
