UZK24.121, UZO24.121

U-Series

Temperature:

The temperature has the most impact on the service life. The hotter the temperature, the earlier the wear-out phase

of the battery begins. The wear-out results in a degradation of battery capacity. Place the battery module in a cool

location, E.g. near the bottom of the control cabinet. Do not place the battery module near heat generating devices.

Do not overcharge batteries!

Fig. 16-1 Service life vs. ambient temperature, typ.

20°C

10

30°C

35°C

40°C

45°C

8

6

4

2

Ambient Temperature

25°C

1

3

5

7

9

Service Life in Years

Design Life

of Battery

A: 3-5 Years

B: 6-9 Years

C: 10-12 Years

A

B

C

Number of discharge cycles and depth of discharge:

Do not discharge batteries more than necessary. Set buffer time limiter to the required buffer time. The number, as

well as the depth of discharging cycles is limited. A replacement of the battery might be necessary earlier.

When choosing the battery capacity, always try to get the next higher capacity than required. The depth of discharge

reduces the service life of the battery and limits the number of cycles.

Fig. 16-2 Battery degradation vs. discharging

cycles, typ.

0

120%

100%

40%

20%

Number of Discharging Cycles

200

60%

80%

Cell Capacity

Depth of

discharge

A: 100%

B: 50%

C: 30%

400

600

800

1000 1200

A

B

C

Store batteries fully charged

Do not store discharged batteries. Keep batteries fully charged!

Charge retention is important to get the longest battery life. Stored batteries which are not fully charged age faster

then charged batteries. Batteries which are not in use should be recharged at least once a year. The higher the

ambient temperature, the shorter the charging interval. At storage temperatures higher than 30°C, recharging should

be done at least every nine months.

Jul. 2014 / Rev. 1.2 DS-UZK24.121-EN

All parameters are specified at, 25°C ambient temperature unless otherwise noted.

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