SMA Solar Technology AG Battery Management
Technical Description SI5048-TB-TEN110340 103
13.4.4 Manual Equalization Charge
The parameter "520.01 ChrgSelMan" activates the manual equalization charge on the Sunny Island.
If a generator is connected to the system, it is automatically started and stopped once the equalization
charge is completed.
13.4.5 Silent Mode
In addition to the float charge, the silent mode can only be used ("224.01 SilentEna" parameter)
when operating with the power distribution grid.
The main purpose of the silent mode is to save energy by switching from charge mode to standby
mode in utility backup systems where the Sunny Island is predominantly in float charge.
The silent mode is activated after the time set for float charge ("224.02 SilentTmFlo" parameter) has
expired. The Sunny Island remains in silent mode for a fixed time ("224.03 SilentTmMax" parameter)
or until the battery voltage per cell is 0.14 V lower than the set voltage ("222.10 ChrgVtgFlo"
parameter). This ensures that the battery is always fully charged, even in silent mode. If a grid failure
is detected during silent mode, the Sunny Island makes a stand-alone grid available within 10 sec.
Carrying out the equalization charge
An equalization charge should be performed at least once a year. After a long period of
time without charging, e. g., in the case of plants which are only operated seasonally,
manual equalization charges are required at the end or at the beginning of the season.
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