September 12, 2023

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.

		Quantity 1-49	50-99	100-499	500+
PST-Backup-Jr-5A vehicle battery backup with 1.2AH battery and 5A maximum output		$108	$98	$89	$86
PST-Backup-Jr-12A vehicle UPS with 1.2AH battery and 12A maximum output		$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		$115	$106	$89	$86
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
Optional DIN Rail mounting. Depending on application you might need two of these kits
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
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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