6
2 Temperature and Floating Voltage
2.1 Ambient Temperature
The best ambient temperature of using FAAM FLL battery is 20
°
C
. At 20
°
C
,
FAAM battery can be discharged 100% of its capacity. If the ambient temperature is
different, it can be improved with methods as follows:
Change the environment, such as adopting cooling system, changing the position of
the batteries, and improve ventilation.
Adopt temperature revising method, if the ambient temperature is higher, decrease
the floating charge voltage; if lower, increase the floating charge voltage.
Floating Voltage
The purpose of choosing certain floating voltage is to reach the designed life and rated
capacity of the battery. If the floating voltage is higher, then the floating current is also
higher, it will accelerate the corruption the grid and shorten the life of the battery. If
the floating voltage is lower, the battery can’t be kept in full charged state, this will
crystallize PbSO
4
, decrease the capacity, and also shorten the life of the battery.
At 20°C, if the floating voltage is 2.27±0.02V/cell, the designed use life of FAAM
FLL battery is over12 years, in accordance with the Eurobat Guide In other degree,
please adjust according to Table 4-2.
Internal resistance and short circuit current
The internal resistance of the battery is a dynamic nonlinear parameter that is
continuously changed along with the temperature and discharge state. The internal
resistance is the lowest when battery is full charged. The table 2-1 shows the internal
resistance and short circuit current of FAAM battery in fully charged state.