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July 3, 2014    

12 Volt and 24 Volt 36 and 72 Watt DC UPS Battery Backup Power Supplies, DIN Rail

DC UPS 12 and 24 Volt Battery Backup Power Supply
The PST-SP series of battery back up power supplies consist of a universal input (85 to 260 volts AC, 47 to 63 Hz, or 120 to 340VDC) 12 volt (or 24 volt) power supply with a built-in DC Battery Backup charger and switch. They can charge any 12 volt (or 24 volt) SLA, gel cell, VRLA, or AGM lead acid battery and instantly switch over to battery power upon power failure with zero crossover time. These power supplies can be used with or without the battery as convenient DIN rail mount power supplies. They are designed for infrequent battery use. The charger current is small, so it charges the battery slowly and may not be applicable to systems having frequent, regular power outages

5 volt DC UPS battery back up switching power supply
  6 Volt Battery Backup Power Supply and DC UPS
12V DC UPS control module for use in cars and trucks
12 Volt DC UPS for use in Cars and Trucks

The battery voltage is not regulated, and the output during AC operation is the same as the battery charge voltage so the 12 volt system will vary from about 13.6 to 10 volts during operation. The 24 volt system will vary between 27.2 to 20 volts during battery operation. If battery back-up is not required there is pot for adjusting the power which is accessible from the outside. There is also a remote turn-on option to allow low voltage switching of the AC power, but not the battery power.

These units can also be used as high voltage input DC/DC converters with battery backup. The input voltage can be DC instead of AC if the supply voltage is between 140 to 340 VDC.
Model   Qty 1 - 9 Qty 10 - 49 Qty 50-99 Qty 100-199 Qty 200+
PST-SP12AS 12 volt, 36 Watt $59.50
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$48.50 $44.00 $41 $38
PST-SP12AL 12 volt, 72 Watt $97.90
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$78.50 $71.50 $67 $65
PST-SP24AS 24 volt, 36 Watt $59.50
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$48.50 $44.00 $41 $38
PST-SP24AL 24 volt, 72 Watt $97.90
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$78.50 $71.50 $67 $65
AC DC Power Supply with Battery Backup  
MODEL PST-SP12AS PST-SP24AS PST-SP12AL PST-SP24AL
VOLTAGE 12V adjustable between 10.5 and 13.5 volts 24V adjustable between 22.5 and 25.5 volts 12V adjustable between 10.5 and 13.5 volts 24V adjustable between 22.5 and 25.5 volts
VOLTAGE WHEN USED WITH BATTERY BACKUP FUNCTION User must adjust the output voltage to 12.9 to 13.8 volts to ensure battery charging User must adjust the output voltage between 25.8 and 27.6 volts to ensure battery charging User must adjust the output voltage to 12.9 to 13.8 volts to ensure battery charging User must adjust the output voltage to between 25.8 and 27.6 volts to ensure battery charging
VOLTAGE DURING BATTERY OPERATION 12.5 volts to 9.3volts 25.7 volts to 19.3 volts 12.5 volts to 9.3volts 25.7 volts to19.3 volts
Low Voltage Battery Cutoff? No No No No
CURRENT 3A 1.5 A 6A 3 A
CROSSOVER TIME zero crossover time
Connections Screw terminals
Screw terminal torque values 0.4-0.5 N-m
DIMENSIONS 71mm x 106mm x 65mm 126mm x 106mm x 65mm
WEIGHT 290 grams, 10 oz 500 grams, 17.5 oz
INPUT VOLTAGE 85-265VAC or 120 - 340 VDC
SUPPLY FREQUENCY 47-63HZ
OUTPUT VOLTAGE TOLERANCE ±1%
MAX RIPPLE&NOISE <100mV PP
SWITCHING FREQUENCY ~130kHz
OPERATION TEMP -25~+70°C
EFFICIENCY >80%
BATTERY CHARGE CURRENT 200 mA max
Certificates CE mark
ROHS ROHS available on special order
Overcurrent protection The power supply will continue to supply power up to 140% of rated current and then will go into "hiccough" mode, turning on briefly to check if the current is too high, then turn off again. During the "off" phase of the hiccough battery power is present.
LED Indicator LED is on when DC output is present

  • Adjustable Current Limit
  • Universal input AC/DC switching power supply with DC UPS
  • DC Battery Backup, charges 12 volt lead acid battery (or 24 volt lead acid battery) and switches over to battery power upon power failure with zero crossover time
  • During Power Failure the battery voltage passes through without regulation
  • 35 mm DIN mounting (EN50022-35) or flange mounting brackets included
  • Output Voltage adjustment
  • Remote on/off feature controls both the AC and Battery Backup power
  • Over Temperature Protection
  • Over Current protection
  • High efficiency switching power supply with universal input and battery back up
  • Can be used in parallel for increase in current
  • The battery is external and can be sized to meet your backup needs
  • The battery is not included in the price, but can be obtained from PowerStream
  • Soft start

12 Volt battery backup switching power supply
36 Watt Battery Backup Power Supply
Battery back ups, 12 volts and 24 volts
5 volt 14 amp battery backup power supply
72 Watt Battery Backup Power Supply
12V Wiring Information
24V Wiring Information
User's Manual



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  1. 2 volt battery back up DC UPS, 24 volt battery back up DC UPS. Battery back up, Battery backup switchmode AC/DC power supply with universal input.

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Lund Instrument Engineering, Inc. All rights reserved. by Mark W. Lund