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June 11, 2024
battery backup for buses, cars and vehicles
Small, self-contained automotive battery backup system with 1.2 AH battery. It is a 12 volt DC UPS module or battery backup (BBU) keeps 12 volt equipment alive in cars, trucks and taxis using an internal sealed lead acid battery.

Complete battery backup for 12V equipment in buses, cars and other vehicles with 1.2AH battery

battery backups for buses, transit, fire trucks, vehicle instrumentation
More battery backups for buses, emergency vehicles and vehicle instrumentation

Self contained battery backup UPS for cars and buses
Complete backup for 12V devices in vehicles with 5AH battery
The Backup-Jr UPS is designed to keep your equipment from losing power or rebooting during engine start-up, in buses, cars, and other vehicles. This ensures 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.

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 or bus'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 Backup-Jr 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 bus's engine start-up process.

The Backup-Jr DC-UPS powers your equipment in the vehicle using the vehicle's electrical system, but switches to external battery power when the car's battery is removed, stolen, or drops below a predetermined voltage, acting as a battery backup (BBU) and power conditioner. It is not necessary to run an extra sense wire to the ignition, voltage sensing takes care of the decision making.

Allows for safely charging our internal battery from the car's electrical 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 11.8 volts. Keeping computers and video systems alive during engine starting or other interruptions in power in cars, buses, ambulances and trucks.
50-99 100-499 500+
PST-Backup-Jr-5A vehicle battery backup with 1.2AH battery and 5A maximum output add_to_cart.gif $108 $98 $89 $86
PST-Backup-Jr-12A vehicle UPS with 1.2AH battery and 12A maximum output add_to_cart.gif $154 $139 $131 $119
PST-Backup-Jr-5A-xx (BKUP12V5A1.2H-xx)
5A vehicle battery backup with 1.2AH battery and 5A maximum output with custom set points
add_to_cart.gif $115 $106 $89 $86
PST-Backup-Jr-12A-Timer with 12A maximum and time-out option add_to_cart.gif 
$199 $180 $163 $153
Replacement battery (one needed) BP1.2-12        
Detailed Specifications PST-Backup-Jr 12A PST-Backup-Jr 5A
Maximum pass-through current 12 Amps continuous 5 Amps continuous
Max Charge Current 400 milliamps. 400 milliamps
Maximum input voltage (steady state) 15V 15V
Maximum input voltage (transient) 40V 40V
Maximum pass-through wattage 144 Watts 60 Watts
Transient pass-through current 13 amps for 40 seconds
20 amps for 5 seconds
Over 20 amps immediate shutdown
6 Amps for 40 seconds
Transition time Less than 50 microseconds from main battery to auxiliary battery
less than 50 microseconds from auxiliary battery to main 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 switch-over.
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
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
5A for 300 seconds
4A for 400 seconds
2A for 1000 seconds
1A for 44 minutes
60mA for 20 hours
Charge voltage Factory selectable, default is 13.8V Factory selectable, default is 13.8V
Internal battery 1.2 AH Sealed lead acid battery
Charge algorithm Constant current until the battery voltage reaches 13.4 volts, taper charge above 13.4 volts to zero current at 14.1 volts
Nominal Battery Voltage 12 Volts
Size 3x 4.7 x 3.9 inches (5 inches including flanges)
76 x 119 x 99 mm (127 mm including flanges)  
Vehicle's electrical bus reconnects to the load when its voltage raises to: 13.5 volts
Load is switched to the auxiliary battery when the main voltage drops below 13.1 volts
Auxiliary battery is disconnected from the load when the auxiliary battery's voltage drops below 10 volts
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
Optional DIN Rail mounting. Depending on application you might need two of these kits din rail mount
LEDs LEDs light up showing whether the load is being powered by the car or the auxiliary battery
Weight 1.8 lbs or 0.8 kg
Mounting orientation May be safely mounted in any orientation
Time Out Option The Time-Out option turns the unit completely off after the controller switches to the Auxiliary Battery. The time is adjustable from 5 to 30 minutes. The unit turns back on when the Main power is restored.
Theory of operation PDF User guide for 5A version
User's guide for 12A version
Dimensioned drawing

dimensioned drawing of the 12V 1.2AH battery backup for vehicle electronics
Bus battery backup system, car battery backup system, truck battery backup system  

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