Battery Management
SMA
Technologie AG
Page 88
SI5048-11:EE4206
Technical Description
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.
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
0
("#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.
AptTmBoost = 120 min
Spannung
/
V
olt
ag
e
[V]
S
trom
/
Cur
rent
[A]
Zeit / Time
ChrgVtgBoost = 2.4 V
AptTmFul = 5h
AptTmEqu = 10 h
I-Phase /
Bulk Phase
U -Phase /
Absorbtion Phase
0
U-Phase /
Float Phase
ChrgVtgFul = 2.4 V
ChrgVtgEqu = 2.4 V
Ruhephase/
Silent Mode
(nur beim Netzbetrieb /
only with public grid)
U-Phase /
Float Phase
SilentTmMax = 12 h
ChrgVtgFlo = 2.25 V
SilentTmFlo = 3 h
Summary of Contents for Sunny Island 5048
Page 22: ...The Sunny Island 5048 SMA Technologie AG Page 22 SI5048 11 EE4206 Technical Description...
Page 26: ...Safety Instructions SMA Technologie AG Page 26 SI5048 11 EE4206 Technical Description...
Page 94: ...Battery Management SMA Technologie AG Page 94 SI5048 11 EE4206 Technical Description...
Page 114: ...Connecting External Sources SMA Technologie AG Page 114 SI5048 11 EE4206 Technical Description...
Page 160: ...Contact SMA Technologie AG Page 160 SI5048 11 EE4206 Technical Description...
Page 169: ...SMA Technologie AG Glossary Technical Description SI5048 11 EE4206 Seite 169...
Page 171: ......
