Battery Management SMA Technologie AG
Page 92 SI5048-11:EE4206 Technical Description
13.5 Battery preservation mode
The Sunny Island 5048 has a sophisticated battery preservation mode. The battery
preservation mode prevents the battery from being deeply discharged, as much as
possible, when the energy supply is low and thus prevents 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 drops 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 inverter into standby mode in times during
which the energy is not absolutely necessary (e.g. at night). You define the start time
using the "#223.01 BatPro1TmStr" parameter and define the stop time using the
"#223.02 BatPro1TmStp" parameter.
Level 2: The second level of the battery preservation mode ensures that the inverter
regularly starts every two hours but only during the window of time in which an energy
supply is expected and attempts to charge the battery from the AC side. For
photovoltaic systems, this occurs during the day. In this case, you define the start time
using the "#223.03 BatPro2TmStr" parameter and the stop time using the "#223.04
BatPro2TmStp" parameter.
Level 3: The third level ensures that the battery is protected from deep discharge and
thus protected against damage. In this case, the inverter is switched off completely. To
start the inverter, please see section 9.5 "Reactivating the Device Following Automatic
Shutdown" (Page 63).
During all three levels, the inverter is only stopped if no battery current flows within
5 minutes (limit 3 A charging current).
Standby Standby
0h 6h 12h 18h
BatPro1TmStp BatPro1TmStr
Operation
24h
Standby Standby
Regular starts
0h 6h 12h 18h
BatPro2TmStp BatPro2TmStr
24h
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