Charge Control - SMA Sunny Island 5048 Installation Instructions Manual

Battery Management

13.4 Charge Control

The Sunny Island 5048 performs charge control in 3 phases, using the IV0V process.
When the device operates with the public grid, there is also an optional fourth phase
called silent mode.
I-Phase /
Bulk Phase
AptTmBoost = 120 min
ChrgVtgBoost = 2.4 V
ChrgVtgFul = 2.4 V
AptTmEqu = 10 h
ChrgVtgEqu = 2.4 V
The I stands for the constant current phase (I phase). In this phase, the charging is
limited by the maximum defined battery current ("#222.01 BatChrgCurMax"
parameter), the nominal generator current ("#242.03 GnCurNom" parameter), the
nominal grid current ("#250.03 GdCurNom" parameter) or the maximum AC charging
current of the Sunny Island 5048 ("#210.02 InvChrgCurMax" parameter). 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 V
("#222.07 — #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 5048 remains in this phase for the defined period of time ("#222.01
— #222.03", AptTmBoost or AptTmFul or AptTmEqu" parameters). For this charging
phase, the Sunny Island 5048 automatically selects one of the three possible charging
processes (boost, full, equalizing) that are described in more depth between sections
13.4.1 and 13.4.3. The remaining charging time (display value "#120.04 AptTmRmg")
of this phase and the current process (display value "#120.05 BatChrgOp") can be
read on the display.
The following figure displays the relationship and the process diagram of the charging
phases and charging processes.
Page 88 SI5048-11:EE4206
U -Phase /
0
Absorbtion Phase
AptTmFul = 5h
U-Phase / Ruhephase/
Float Phase Silent Mode
(nur beim Netzbetrieb /
only with public grid)
SilentTmFlo = 3 h
ChrgVtgFlo = 2.25 V
SilentTmMax = 12 h
SMA
Technologie AG
U-Phase /
Float Phase
Zeit / Time
0
Technical Description