Data Sheet

UB20.241
UB-Series
24V, 20A, DC-UPS
10. EFFICIENCY AND POWER LOSSES
Efficiency typ. 99% Power supply mode, 20A output current,
batteries fully charged
Power losses typ. 1.9W Power supply mode, 0A output current,
batteries fully charged
typ. 4.8W Power supply mode, 0A output current,
during charging batteries < 10Ah
typ. 6.8W Power supply mode, 0A output current,
during charging batteries > 10Ah
typ. 4.6W Power supply mode, 20A output current,
batteries fully charged
typ. 4.2W Battery mode, 0A output current
typ. 7.6W Battery mode, 10A output current
typ. 21.3W Battery mode, 20A output current
11. LIFETIME EXPECTANCY AND MTBF
Calculated lifetime expectancy
*)
440 000h
*)
Power supply mode, 10A and 40°C
1 244 000h
*)
Power supply mode, 10A and 25°C
122 000h
*)
Power supply mode, 20A and 40°C
345 000h Power supply mode, 20A and 25°C
MTBF
**)
SN 29500, IEC 61709 649 000h Power supply mode, 20A and 40°C
1 097 000h Power supply mode, 20A and 25°C
MTBF
**)
MIL HDBK 217F 372 000h Power supply mode, 20A and 40°C; Ground Benign GB40
(Ground benign) 498 000h Power supply mode, 20A and 25°C; Ground Benign GB25
MTBF
**)
MIL HDBK 217F 107 000h Power supply mode, 20A and 40°C; Ground Fixed GF40
(Ground fixed) 137 000h Power supply mode, 20A and 25°C; Ground Fixed GF25
*) The calculated lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the
lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according
to the capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15
years (131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a
device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that
statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit
has been running for 50 000h or only for 100h.
Feb. 2016 / Rev. 2.1 DS-UB20.241-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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