Data Sheet

UB20.241
UB-Series
24V, 20A, DC-UPS
Setting of battery size selector
- ctd.
small battery
< 10Ah
large battery
> 10Ah
Deep-discharge protection typ. 10.5V / 9.0V 10.5V / 9.0V At 0A / 20A buffer current,
center-tap connected,
Buffering stops as soon as one battery
falls below this value.
typ. 21V / 18V 21V / 18V At 0A / 20A buffer current,
center-tap not connected
Required min. battery voltage
to allow charging
3)
min. 2 x 7V 2 x 7V center-tap connected
min. 14V 14V center-tap not connected
Battery charging time max. 4h 40mins
4)
- for a 7Ah battery
max. 8h
4)
4h
4)
for a 12Ah battery
max. 44h
4)
22h
4)
for a 65Ah battery
max. 94h
4)
47h
4)
for a 140Ah battery
Battery discharge current typ. 170mA 170mA in battery mode at no output current
1) The end-of-charge voltage depends on the battery temperature. At 20°C the end-of-charge voltage is set to 13.6V (rsp. 27.2V) and
changes with -18mV/°C for 12V batteries and -36mV/°C for 24V batteries but not higher than 14.2V rsp. 28.4V.
2) Corresponds to the temperature readings of the external temperature sensor of the battery and is not the surrounding air temperature
of the DC-UPS. Frequent charging below +5°C (41°F) reduced the lifetime of the battery and should be avoided. Low temperatures
increase the battery impedance and also change the battery characteristics. This could result in a false “replace battery” signal or an
unexpected interruption of a buffer event, especially with small batteries. To avoid this, the temperature range for charging is limited at
low temperatures depending on the battery size. If the end application requires temperatures below +5°C, it is recommended to use
batteries >10Ah.
3) Below this voltage level, charging does not start and the DC-UPS reports “check wiring”.
4) The listed charging time applies for a complete discharged battery until the DC-UPS indicated “Ready” with the green status LED. In
practice, the charging time can be much shorter, since the battery is usually not completely discharged. A very long charging time is most
likely caused by a defective or old battery.
5) Batteries smaller than 6Ah are only recommended when the load current is below 10A.
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.
www.pulspower.com Phone [phone] Germany
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