Narada 6V Series - Page 5

6V&12V Serials
07 08
The oating voltage calculation formula at different temperatures is:
V
T
=V
25
-(T-25)×0.003
V
T
—Floating voltage at T temperature;
V
25
—Floating voltage at 25°C;
The Equalization voltage calculation formula at different temperatures is:
V
T
=V
25
-(T-25)×0.005
V
T
—The charging voltage at T temperature;
V
25
—Average charge voltage at 25°C;
Floating voltage and temperature
The specic oating voltage is selected to operate the battery in its best condition. If the oating
voltage is too high, the oating charge current will increase, and the corrosion speed of the grid
will be accelerated, thereby reducing the service life of the battery. When the oating voltage is too
low, the battery cannot maintain a fully charged state, resulting in sulfation, capacity decrease, and
shorten the battery life.
At 25°C, the oat voltage of each series of Narada is shown in Table 2-1 below, and the temperature
compensation coefcient is -3mV/°C/cell.
Equalization charge voltage and temperature
VRLA batteries need to be charged on a regular basis in order to ensure normal operation of the
battery. At 25°C, the average charging voltage for each series of batteries is shown in Table 2-2.
Similarly, the average charging voltage needs to be adjusted with the ambient temperature, and the
temperature compensation coefcient of the battery charging voltage is -5 mV/°C/cell.
Table 2-1 Floating Voltage of Each Series (25°C)
Table 2-2 Equalization charging Voltage of Each Series (25°C)
Table 2-3 Temperature and voltage setting
MP/MPG
Acme/AcmeG
GP/GPG
ICS
UDS
DT
12REXC
HRL
HTB/HTB-F
MP/MPG
Acme/AcmeG
GP/GPG
HRL
HTB
HTB-F
ICS
UDS
DT
12REXC
≤10
15
20
25
30
35
40
≥45
2.30
2.28
2.27
2.25
2.24
2.22
2.21
-
2.32
2.30
2.29
2.25
2.26
2.24
2.23
2.21
2.43
2.40
2.38
2.35
2.33
2.30
2.28
-
2.38
2.35
2.33
2.30
2.28
2.25
-
-
2.25
2.25
2.25
2.25
2.25
2.25
2.25
2.25
2.27
2.35
2.35
2.35
2.35
2.35
2.35
2.35
2.35
2.35
2.30
Battery serials
Battery serials
Temperature(°C)
MP, MPG, Acme, AcmeG,
GP, GPG, HRL, ICS, UDS,
DT, 12REXC
MP, MPG, Acme, AcmeG,
GP, GPG, HRL, HTB,
HTB-F, ICS, UDS, DT
12REXC
HTB, HTB-F,
Floating voltage(V/cell)
Floating voltage (V)
Equalization voltage (V)
Equalization voltage(V/cell)
Note:
(1) Please refer to the formula for each series, and calculate separately.
(2) The temperature compensation is not recommended for Narada 12V series batteries when oating voltage
is lower than 2.20V or higher than 2.30V/cell, and equalization voltage is lower than 2.28V/cell or higher than
2.43V/cell, please refer to followed table.