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24 V dc UPS for external battery 17-130 Ah. 10 A

  • Load current 10 A
  • Requires just one 12 V dc battery
  • Battery charging with temperature compensation
  • Electronic overload/short-circuit protection
  • Relay outputs for status

Product description

UB10.242 is primarily intended for use where there are requirements for long back-up times with relatively low current. A complete DC-UPS system consists of a control unit and battery, and power supply with suitable power for the application. In the event of a power outage, the battery is automatically switched in and supplies the connected loads. The control unit requires just (1) 12 V battery that then transforms the battery voltage up to 22.3 V dc. Two batteries do not need to be matched with one another and the output voltage does not follow the battery's discharge curve but is instead constant at 22.3 V. The battery capacity is utilized 100 % compared with two batteries connected in series, where one of the batteries is not fully charged.
Two relay outputs indicate status; the module is ready (battery capacity >85 %) and the module is active (back-up mode). The control unit tests the battery's condition in cycles. When it is time to replace the battery, a relay output is activated (replace battery). The control unit has an integrated temperature sensor to optimize the final charging voltage. If the battery is placed at another location and the ambient temperature differs from the control unit, a compensation must be set, which is done using a switch on the front. To attain the longest lifetime for the battery, we recommend placing the battery in the coolest part of the cabinet.
The back-up time is dependent on the capacity and performance of the battery and the load current. On the data sheet, we show some times for different standard batteries. The control unit protects the battery from deep discharge. The control unit shuts off the back-up function when the battery voltage drops under a given value. There is also an input, Inhibit, for external shut-off of the back-up time.

In the event of a battery fuse fault, the “ready” output is deactivated and a red LED lights on the control unit. The output is current limited and turns itself off after about 5 seconds after a short circuit to spare the battery and at the same time, avoids tripping the battery fuse. In the event of a short circuit in the battery mode, the module supplies about 20 A, which helps trip any secondary fuses.

 Monitoring of the battery fuse and current limitation in the event of short circuits provides increased reliability and guarantees that the UPS will function after a short circuit. The input is galvanically isolated from the output side.


Backup times

Backup times

Backup times

Discharge curve with 2 A load current

Discharge curve with 10 A load current


Parts Price


Photo of UB10.242

DC UPS 24V dc I/P 24V dc 10A O/P 17-130Ah

Technical data

Input data

Input voltage from the unit 24 V DC
Input voltage from the battery 12 V DC
Input voltage for battery connection 22,8 V DC
Input current during charging 2 A

Output data

Output current at 24 V dc 10 A
Output voltage for battery operation 22,25
Output voltage normal operation 24 V DC
Output voltage at buffering 22,25 V DC
Output current for battery operation max 10 A (15 A @ 5 s)
Output current during operation max 15 A

Efficiency / Lifetime / MTBF

Efficiency 97,8 %
Life span 114 000 h @ 10 A, 40 °C
MTBF (IEC 61709) 886 000 h @ 10 A, 40 °C


Width 49 mm
Height 124 mm
Depth 117 mm
Weight 0,545 kg


Approvals ABS, CB, CE, CSA, CSA US, EAC, EX, GL, IECEx, UL
IP class IP20
Charging the battery type 3 A
Material protection Aluminium
Ripple max 20 mV pp
Voltage level for battery connection 22,3 V DC
Temperature min without derating -25 °C
Temperature max without derating 50 °C
Permitted battery sizes 17-130 Ah
Type Power Supply DC-UPS


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