SMA America, LLC
13 Battery Management
Technical description
SI4548_6048-US-TB_en-13
109
13.4 Charge Control
The Sunny Island uses a three-phase charge control, using the IUoU procedure. When operating with
the utility grid, a fourth level, Silent Mode, is optionally available.
The I stands for the constant current phase (I phase). In this phase, the charging is limited by the
maximum defined battery current (parameter "222.01 BatChrgCurMax"), the nominal generator
current (parameter "234.03 GnCurNom"), the nominal grid current
(parameter "232.03 GdCurNom") or the maximum AC charging current of the Sunny Island
(parameter "210.02 InvChrgCurMax"). The respective value reached first is the limiting value. During
this phase, the battery voltage increases as the battery is charged.
Once the battery voltage reaches the predefined value for the second phase Uo
("222.07 to 222.09", ChrgVtgBoost or ChrgVtgFul or ChrgVtgEqu parameters), the constant voltage
charging (absorption phase) begins.
In this phase, the battery voltage is maintained at a constant level, resulting in a continually decreasing
battery current. The Sunny Island remains in this phase for a defined period of time
("222.02 to 222.04", AptTmBoost or AptTmFul or AptTmEqu" parameters). For this charging phase,
the Sunny Island automatically selects one of three possible charging methods:
• Boost charge (see Section 13.4.1, page 111)
• Full charge (see Section 13.4.2, page 111)
• Equalizing charge (see Section 13.4.3, page 112)
The remaining charging time (display value "120.04 AptTmRmg") of this phase and the actual
process (display value "120.05 BatChrgOp") can be read on the display.
Summary of Contents for Sunny Island 4548-US
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