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May 17, 2024

Complete battery backup for 24V equipment in vehicles

battery backup for vehicles and buses
Small, self-contained automotive battery backup system with 1.2 AH battery
24 volt DC UPS module or battery backup (BBU) keeps 24 volt equipment alive in cars, trucks and taxis using an internal sealed lead acid battery. May be mounted in any orientation.
battery backups for buses, transit, fire trucks, vehicle instrumentation
More battery backups for buses, emergency vehicles and vehicle instrumentation
complete 12V UPS BBU for buses including battery and  box
Complete 12V DC-UPS with control module and 1.2AH lead acid battery
  Quantity 1-49 50-99 100-499 500+
PST-Backup-1.2-24V battery backup 1.2AH 24V with 12 Amps pass through add_to_cart.gif $198 $181 $170 $154
Replacement batteries (two needed) BP1.2-12        
The PST-Backup UPS devices are designed to keep your equipment from losing power or rebooting during engine start-up, ensuring these spikes and sags in power don't shorten the life of your mission critical electronics. We do this by providing uninterrupted, clean, consistent power to your equipment, extending the life of your electronics. It is not necessary to run an extra sense wire to the ignition, voltage sensing takes care of the decision making.

The backup prevents your equipment from running the vehicle's battery down avoiding jump-starts. It switches over to the auxiliary battery when the engine is shut off and the alternator stops or the car's battery drops below 11.8 volts. This means you never have to worry about that after-market equipment leaving you with a dead battery in the morning.

The PST-Backup isolates its battery from the vehicle, so it can't be discharged by the vehicle's other electronics, and it won't try to participate in the engine start-up process.

The PST-Backup DC-UPS powers your equipment in the vehicle using the car electrical system, but switches to external battery power when the car's or bus's battery is removed, stolen, or drops below a predetermined voltage, acting as a battery backup (BBU) and power conditioner.

Allows for safely charging our internal battery from the car's or bus'selectrical bus by isolating and current regulating the connection to the auxiliary battery. This uninterruptible power supply is designed to withstand the harsh electrical and temperature requirements of automotive equipment including spike, dropouts, load dumps, jump-starting, high and low temperatures.
This DC-UPS contains a 1.2 amp-hour sealed lead acid battery. It is charged from the vehicle's electrical system and switches your load to its internal battery when the engine is turned off, or at any other time that the electrical bus drops below 23.6 volts. Keep computers and video systems alive in buses and other vehicles during engine starting or other interruptions in power.
Detailed Specifications PST-Backup-1.2-24V
Maximum pass-through current 12 Amps continuous
Max Charge Current 2000 milliamps.
Maximum input voltage (steady state) 30V
Maximum input voltage (transient) 44V
Maximum pass-through wattage 288 Watts
Transient pass-through current 13 amps for 10 seconds
18 amps for 1 seconds
The relay should not open or close during transients above 12A
Transition time Less than 6 milliseconds from main battery to auxiliary battery
We have a capacitor to keep the voltage up during the transition and have not had any problem with customer's equipment dropping out during the switchover.
Backup time 12A for 50 seconds
9A for 100 seconds
6A for 200 seconds
2A for 1000 seconds
1A for 44 minutes
60mA for 20 hours
Charge voltage set point The auxiliary battery will be charged when the Main voltage is above 27V
Internal battery 1.2 AH 24V Sealed lead acid battery
Charge algorithm Constant current until the battery voltage reaches 29.4 volts, constant voltage 27.6V
Nominal Battery Voltage 24 Volts
Size 3 x 4.9 x 5.7 inches (6.8" including flanges)
76 x 124 x 145 mm (173 mm including flanges)  
Vehicle's electrical bus reconnects to the load when its voltage raises to: 26 volts
Auxiliary battery is disconnected from the load when the external battery's voltage drops below 20 volts
The available custom set points are Main On, Main Off, Charger On, Charger Off, Aux On, Aux Off This document describes how to engineer and specify the 6 custom set points if desired
Temperature Range Minimum ambient temperature -10°C (-40°C available upon request)
Maximum ambient temperature of 70°C
When the case temperature gets above 45°C the charge current is automatically reduced to maintain system operation at higher temperatures.
Storage Temperature -20°C to 70°C
Connection Screw terminals, included are spade terminal adapters as shown below
Included spade (faston) connector adapters Shows included spade connector adapters
LEDs LEDs light up showing whether the load is being powered by the car or the auxiliary battery
Orientation Can safely be mounted in any orientation.
Weight 3.3 lbs or 1.5 kg
User's guide for 24V 12A version
Dimensioned drawing
Automotive battery backup system, bus battery back up, car battery backup system, truck battery backup system

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