OPzV Battery Operation Manual
7
Table 3-4 equalization charge of VRLA battery(25
℃
)
Series
Equalization charge
（
V/cell
）
OPzV
2.35
The formula to calculate equalization voltage at different temperature:
V
T
= V
25
-(T-25)×0.005
V
T
—Equalization charge voltage at T temperature
V
25
—equalization charge voltage at 25
℃
,
When the boost voltage is lower than 2.30V/cell or higher than 2.45V/cell after being adjusted
by temperature compensation coefficient, we suggest to stop making temperature compensate
and charge the battery with 2.30V/cell or 2.45V/cell.
3.4 Ambient Temperature vs. Battery Life
Higher temperature will harm the battery and reduce battery life. When temperature exceeds
25
℃
, the battery life will decrease half per 10
℃
temperature rises. For example, the designed life
of battery at 25
℃
is 10 years, when battery operates at 35
℃
, for a long period of time the actual
life is only 5 years.
t
25
＝
t
T
×2
（
T
－
25
）
/10
Notes
：
T is the actual ambient temperature;
t
T
is designed life at T ambient temperature
t
25
is designed life at 25
℃
ambient temperature
The heat disseminates performance of VRLA battery is bad, it’s liable to cause thermal run
away when heat accumulates. Please improve ventilation and temperature condition when room
temperature is high. The distances between batteries should not be smaller than 10mm. Please
also adjust the float voltage and equalization voltage according to the manual.
4
Charge and discharge requirements
4.1 Equalization charge
Equalization charge is needed in following conditions:
a The floating voltage of at least two batteries are lower than 2.16V/cell;
b Floating operation is more than three months.
The method of equalization charge is: First charge the batteries with the constant current of
0.1C
10
A
～
0.15C
10
A till the average voltage of the batteries increases to 2.35V/cell(25
℃
)
，
then
charge the batteries with constant voltage of 2.35V/cell, the time of equalization charge is 24
hours.
4.2 Charge after discharge
The batteries need to be charged in time after discharge. The charge method is constant
current and limited voltage charge: Charge the batteries with constant current of 0.1C
10
A
～
0.2C
10
A
till the average voltage of the batteries increases to a certain voltage, then charge the batteries
with this constant voltage till finishing charge, meanwhile the current will reduce.
