SMA Sunny Island 4248U, Инструкция по установке и эксплуатации

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SI4248U Manual Installation Manual
61
Figure 1-25 Battery Management System State Transitions in Off-Grid Mode
Each charging operation (Boost charge, Full charge, Equalizing charge, and Floating Charge)
can also be activated manually. For customer convenience all transitions are done
automatically and cycle times are adjustable (TcycleFull, TcycleEqual). The number of charge
throughputs (of Amp hours of nominal battery capacity – C20 passed through the battery) are
fixed and not adjustable. Charge throughputs are only calculated from energy passing through
the Sunny Island 4248U. Other DC coupled sources or loads are not taken into account by the
Sunny Island 4248U. On rare occasions, it is possible to meet the requirements of two charge
operations causing the order of the processes to be: Boost, Full and then Equalization for that
charge cycle.
Each charge operation consists of a full charge phase with limited current (by generator
maximum AmpacGenMax current or by maximum DC charge current AmpdcBatMax) and an
absorption phase after the battery voltage has reached the charge voltage set point. The
remaining time for the absorption phase is displayed as a meter (in the Battery section) as
“TabsorbLeft”.
After completion of the absorption phase, the generator is switched off (if a generator is used).
The charge operation is then finished and the charge voltage set point is set to Float. The Float
State only effects the operation of the Sunny Island 4248U in systems with AC coupled PV
(Sunny Boys). The generator is stopped in this state and the control loop which controls the
charge current is inactive. For AC coupled PV, a different control loop stays active while the
Sunny Island 4248U is in Voltage Mode (no Generator running) which controls the output
power of the Sunny Boys by the calculated charge voltage set point (in all charging processes
including Float).
Boost Charge
V=Vcharge Boost
Equaliziation Charge
V=VchargeEqual
Floating Charge
V=VchargeFloat
Full Charge
V=VchargeFull
TcycleEqual days or
30 charge througputs
TcycleFull days or
8 charge throughputs
V > Vc
hargeBoost
for T
absorbBoost
30 %
disc
harge or
aut
o gen st
ar
t
V > VchargeFull
for TabsorbFull
V > VchargeEqual
for TabsorbEqual
TcycleEqual days or 16 charge throughputs
Battery Management System
Normal
Operation
Charge
Normal
Operation
Invert
Energy
Saving
Operation
Silent
“GridConnected” set to “GridCharge” or “GridFeedPV”
AND BatVoltage > BatChar 0.05 V / cell
“Silent” active for more than 12 hrs.
BatVoltage <VchargeFloat - 0.16 V /cell
AND “Silent” active for more than 3 min.
Grid failure
Grid
present Grid
failure
Provides
value for
“BatCharge
Volt”