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Example for calculating the service life and the required replacement cycle:
Parameters for the example:
A 5Ah battery with a design life of 3-5 years is used (e.g. Yuasa battery which is used for type UZB12.051)
The average ambient temperature is 30°C
One buffer event consumes approx. 25% of the achievable buffer time.
One buffer event per day
Calculation:
Ambient temperature influence:
According to Fig. 28-1 curve A, a 2 years service life can be expected for an ambient temperature of 30°C.
Number of discharging cycles: 2 years * 365 cycles = 730cycles in 2 years.
According to Fig. 28-2, curve C has to be used (only 25% of battery capacity is required). 730 cycles have only a
negligible influence in a battery degradation and can be ignored.
Result:
The battery shall be replaced after 2 years.
Please note that the battery degrading begins from the production date (check date code on the battery) which may
shorten the replacement intervals.
Fig. 28-1 Service life versus ambient
temperatures, typ *)
Service Life in Years
10
9
8
C
7
6
B
5
4
A
3
2
1
Ambient Temperature
20°C
25°C
30°C
*)
datasheet figures from battery manufacturer
28.2. P
ARALLEL AND
Do not use the DC-UPS in parallel to increase the output power. However, two units of the DC-UPS can be paralleled
for 1+1 redundancy to gain a higher system reliability.
Do not use batteries in parallel, since the battery quality test might create an error message.
Do not connect two or more units in series for higher output voltages.
Do not connect two or more units in a row to get longer hold-up times.
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
Design Life
of Battery
A: 3-5 Years
B: 6-9 Years
C: 10-12 Years
35°C
40°C 45°C
S
U
ERIAL
SE
www.pulspower.com Phone +49 89 9278 0
UBC10.241, UBC10.241-N1
Fig. 28-2 Cell capacity degradation vs. discharging
cycles *)
Cell Capacity
120%
C
100%
B
80%
A
60%
40%
20%
Number of Discharging Cycles
0
200
400
600
Germany
24V, 10A, DC-UPS
Depth of
discharge
A: 100%
B: 50%
C: 30%
800
1000 1200
22/23
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