Float Charge
Voltage
(
V
)
2. 30
15.0
1 0.6
7.5
3.7
1. 9
20 C
25C
30C
40C
50C
Battery
Actual
Float Life at Different Temperature (Year)
8. Float Life
Characteristic
Float Life
Characteristic
Curves
2 0
3 0
4 0
5 0 C
6 8
8 6
1 0 4
1 2 2 F
Temperature
2 0
1 6
1 0
1 4
8
6
4
5
3
2
1 . 4
1
L
ife
(
Y
e
a
r
)
Float Charge Voltage: 2.30V/Cell
Float Lifetime vs Temperature
According to Arrhenius equation, battery design life
fluctuates with temperature, temperature increases
every 10
℃
, the float lifetime is cut by half.
K1:Equal constant at T1 temperature
K2:1
Equal constant at T2 temperature
Ea : activation energy
-1
-1
R:air constant,8.3143J·mole ·K
T1:environment temperature during
discharge,K
T2: standard temperature 293K
8
At recommended float charging situation at 25
℃
, HR series battery design life is over 15 years. Battery's usage lifetime is
related with ambient temperature, depth of discharge, discharge rate and float charging voltage. In real usage, deep
discharge, frequent discharge, incorrect float charging voltage will effect the battery lifetime directly.
9
Record
The operating record of stationary batteries is very important for battery maintenance and protection. This information is
useful for user to confirm battery life and adjust the longevity.
Battery is allowed to operate at a temperature lower than
25℃
, however, the charging time will be relatively long. After
installing batteries and a week of float charge, it's required to record the following information:
1
）
Battery terminal voltage
2
）
Charger voltage
3) Float charging voltage of each battery
4
）
Internal resistance of each battery. Within the same battery, put the meter that tests internal resistance at the two
terminals that is in farthest diagonal position.
5
）
Environment temperature
6) Check if all the connecting points have been fixed to the proper torque
（
12.4N.M
）.
Use a milliohmmeter to test
internal resistance of each connecting strip. Conduct the test according to the probe potion on the instruction manual.
If the data range is 20% bigger than that during installation, fix screws again to the torque of 11.3N.M. If the data
remains high, please wipe terminals and the interface between terminals and connecting strips.
