ABB i-bus KNX SU/S 30.640.2, Product Manual

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ABB i-bus ® KNX
Planning and application
38 9AKK107992A4580_EN Rev. A | SU/S 30.640.2
12.3 Battery service life
Due to the durability of the accumulators, accumulators should be replaced approx. every four years to
ensure the maximum mains voltage failure bridging time.
The following diagrams show the backup times depending on the number of powered KNX devices.
The top diagram shows the backup times at a larger scale (backup for up to 50 hours). The bottom
diagram shows the backup times at a smaller scale (backup times up to 20 hours).
Fig. 8: KNX backup times up to 50 hours
Fig. 9: KNX backup times up to 20 hours
9A
K
K
10
799
2A
449
2
9A
K
K
10
799
2A
449
1