SMA SI 4548-US - Manual (Page 114)

13 Battery Management SMA America, LLC
114 SI4548-6048-US-BE-en-20 Operating Manual
The battery-preservation mode has three levels that are activated as a result of the battery state of
charge (when the charge falls below the respective limit, parameters "223.05 BatPro1Soc",
"223.06 BatPro2Soc" and "223.07 BatPro3Soc"):
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 parameter
"223.01 BatPro1TmStr" and the stop time using the parameter "223.02 BatPro1TmStp".
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. For PV plants, this 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 recommission the Sunny Island, restart it (see Section 9.5 "Recommissioning After Automatic
Shutdown", page 76).
At all three levels, the Sunny Island is stopped only if no battery charging current flows within ten
minutes (limit: 3 A charging current).
The limits for all three levels can be set independently from each other. This allows individual levels to
be skipped.
Parameter BatPro1Soc < BatPro2Soc
If the BatPro1Soc parameter < BatPro2Soc, level 1 is skipped and only level 2 is carried out.