Battery Management SMA Solar Technology AG
104 SI5048-TB-TEN110340 Technical Description
13.5 Battery Preservation Mode
The Sunny Island has a sophisticated battery preservation mode. The battery preservation mode
prevents deep discharge from the battery as far as possible when the energy supply is low, thus
preventing a total system failure as well as damage to the battery.
The battery preservation mode has three levels that are activated as a result of the state of charge
(when the charge falls below the respective limit, "223.05 BatPro1Soc", "223.06 BatPro2Soc" and
"223.07 BatPro3Soc" parameter):
Level 1: The first level is used to switch the Sunny Island into standby mode at times when the energy
is not necessarily required (e.g., at night). You define the start time using the "223.01 BatPro1TmStr"
parameter and the stop time using the "223.02 BatPro1TmStp" parameter.
Level 2: The second level of the battery preservation mode ensures that the Sunny Island is started
regularly every two hours only in the time period during which energy supply is expected, and that it
attempts to charge the battery from the AC side. In case of photovoltaic plants, this time is during the
day. In this case, you define the start time using the parameter "223.03 BatPro2TmStr" and the stop
time using the parameter "223.04 BatPro2TmStp".
Level 3: The third level ensures that the battery is protected from deep discharge and thus protected
against damage. In this case, the Sunny Island is switched off completely. To start it, see section
9.5”Reactivating the Device Following Automatic Shutdown” (page64).
At all three levels, the Sunny Island is stopped only if no battery current flows within 6 minutes
(limit: 3 A charging current).
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