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19
Fig. 13. Mounting of the temperature sensor.
The PSU has a separate space in the internal memory, used for recording of the registered battery temperature.
The recording cycle is performed in 6-hour intervals, enabling temperature registration for a period of 5 years. With
such an extended registration period, the user is able to control the temperature fluctuation range and to determine
its impact on the life of the batteries.
The nominal battery operating temperature recommen
ded by many manufacturers is 25°C.
Working at elevated temperatures will significantly shorten the battery lifetime. The service life is
reduced by half for each sustained temperature ri
se of 8°C above the nominal temperature.
This means that the batter
y lifespan, when operated at 33°C, can be decreased by 50%!
6.8.
Standby time.
Battery-assisted operating depends on battery capacity, charging level and load current. To maintain an
appropriate standby time, current drawn from the PSU in battery mode should be limited.
Required, minimum battery capacity to work with the PSU can be calculated with the following formula:
Q
AKU
= 1.25
﴾
﴾
I
d +
I
z
﴿ •Td + ﴾
I
a +
I
z
﴿ •Ta + 0.05
Ic
﴿
where:
Q
AKU
– the minimum battery capacity [Ah]
1.25
– the factor related to the decrease in battery capacity due to aging
Id
– the current drawn by the load during inspection [A]
Iz
– PSU current consumption (including optional modules) [A] (Table 12)
Td
– required inspection time [h]
Ia
– the current drawn by the load during an alarm [A]
Ta
– alarm duration [h]
Ic
– short-term output current