74 Shield T3 60 – 500KVA User Manual
2) Setting battery number for LFPB
For the cell of each LFPB, the cell voltage is 3.2V; each battery block consists of 1 cell.
In total, if 40 blocks of Lead- Acid battery are used, for the LFPB, the number will be
150. Both the positive and negative are 75 cells.
The battery number setting range is 140-180.The lowest EOD voltage for the LFPB will
be 360V and highest voltage can be 620V.
5.4.3
Battery Capacity Setting
Battery Capacity Setting sets the capacity value of the battery block .For example, if
the system uses 40 blocks of 12V/100AH batteries, the Battery Capacity Setting should
set to 100 Ah. If 240 cells of 2V/1000AH are used, the Battery Capacity Setting should
be set to 1000 Ah.
In case of there are more than one strings of battery in parallel, the battery capacity
setting value will be the times of the single string. For instance, if the configuration is
two strings of 40 blocks of 12V/100AH batteries, the battery capacity setting should be
set to 200AH.
The system sets current limits according to the battery capacity set. For the Lead-Acid
battery, the current limit is 0.2C, and for the LFPB, the current is 0.3C. For instance, the
500kVA is configured to 40 blocks of 12V/500AH batteries, which can provides total
max charging current of 160A.Due to the current limits(0.2C) , the max charging current
will be 100A(0.2*500A).
5.4.4
Float and Boost Charge Setting
In boost charging, the system charges the batteries with constant current. After the
period, the system will enter the float charging.
For the Lead-Acid battery ,the default float charge voltage per cell is 2.25V, boost
charge voltage is 2.35V
；
For the LFPB, the default float and boost charge voltage per cell is 3.45V
5.4.5
EOD Voltage Setting
The EOD voltage 0.6C is the EOD voltage when the discharging current is larger than
0.6C;
EOD voltage 0.15C is the EOD voltage when the discharging current is less than
0.15C.EOD voltage decreases linearly as the EOD voltage Current increases from 0.15C
and 0.6C, as shown in
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.75
EOD voltage 0.15C
EOD voltage 0.6C
Figure5-3
EOD voltage
For Lead-Acid battery, the cell voltage is suggested to set to 1.65V/cell at 0.6C, and set
to 1.75V at 0.15C
For the LFPB battery, the cell voltage is suggested to set to 2.7V/cell at both 0.6C and
0.15C.
