Narada 6V Series, Руководство по эксплуатации

Страница: 8 / 13

6V&12V Serials
13 14
Table 3-5 discharge end voltage at different current
I<0.2C
0.2C≤I <0.5C
0.5C≤I <1.0C
I≥1.0C
1.80
1.80
1.70
1.60
Discharge Current(A) Discharge End Voltage(V/Cell)
Fig.3-1: Ambient Temperature VS Available Capacity
The capacity will decrease if the temperature is too low. The reason is that the negative plates is
passivated at lower temperature, then it causes the battery to be failed to recharge and the negative
active material sulfation.
The capacity will increase as the temperature increases. However, the higher temperature will
accelerate the corrosion of the grid and cause water loss inside the battery, thus shorten the life of
the battery.
Conductance, Resistance vs. Capacity
There is a certain corresponding relationship between conductance & resistance and battery
capacity. We suggest to test battery conductance and resistance data at difficult stage with same
type instruments from same factory. Conductance and resistance data is only a reference to judge
whether battery is good. These data cannot replace loading test to judge whether battery is good.
We recommend to test these data on the surface or side of battery post.
Ambient Temperature
VRLA batteries can be used in very low or high temperature. Yet all standard data (such as capacity,
life, floating voltage) are measured under standard temperature of 20°C-25°C. The capacity will
decrease under lower temperature as Fig. 3-1:
Battery life is the battery operation life, it is influenced by many factors. The factors are charge mode,
discharge mode, ambient Temperature and so on.
| Lifetime and influence factors
Floating voltage
Equalization voltage
≤ 0.25C
10
A
The Equalization
charge time is 24h
1.80V/cell per block at
10h rate.
15~25°C
(1) The charge voltage is too high, it will
accelerate corruption of the grid and shorten
life of the battery.
(2) The charge voltage is too low, the battery
will be insufficient.
If the current is too high, the battery
temperature will be higher, then it will cause
water loss, thermal runaway.
The charge time is only aimed at the
equalization charge procedure, it can ensure
the battery can be fully charged.
If the end voltage is too low, it will be difficult to
recharge the battery and decrease the charge
efficiency, thus reduce the life of battery.
When temperature exceeds 25°C, the battery
life will decrease half per 10°C temperature
raise.
t25~35=t
T
×2
(T-25)/10
Notes: T the actual ambient temperature;
T
T
is designed life at T ambient temperature
T
25
is designed life at 25°C ambient
temperature
Charge mode
Discharge
mode
Ambient
temperature
End voltage
/
Voltage
Current
Time
Normal Value Note Main factors Main failure
/
/
(1) Different brands of battery cannot be
installed in one bank;
(2) Different group no. of battery cannot be
installed in one bank or in the same parallels.
If the capacity is failed, the failed battery
should be replaced timely.
Mixed
operation
Replace the
failure battery
/
/