Auxiliary Power Unit – A21822
A21822 / ONBOARD AUXILIARY POWER Auxiliary Power Unit – A21822
The Auxiliary Power Unit – A21822 is an onboard power generation system developed to maintain critical military vehicle systems when the main engine is switched off or unavailable. It supports electrical, pneumatic and hydraulic subsystems, silent-mode operation, onboard climate control and mission equipment across demanding operational environments.
Integrated auxiliary power platform for main-engine-off operation, silent-mode requirements, onboard mission systems and flexible military vehicle integration.
Independent Onboard Power for Mission-Critical Vehicle Systems
The Auxiliary Power Unit – A21822 supplies electrical power to vehicle systems without requiring continuous operation of the main engine. It supports electrical, pneumatic and hydraulic systems during stationary operation, pre-mission preparation and emergency conditions in which the primary engine is damaged or unavailable.
The supplied technical table specifies 28 VDC output voltage, 8.4 kW continuous power, 8.9 kW output power and a maximum current of 330 A.
Flexible Integration Across Ground, Stationary and Airborne Platforms
The A21822 is intended for tracked and wheeled armored vehicles, stationary systems and airborne platforms. Supplied application examples include main battle tanks, self-propelled artillery systems, armored and infantry fighting vehicles, armored personnel carriers, MRAP vehicles, tactical and support vehicles, rocket systems, shelters, tents, helicopters and aircraft.
Depending on platform requirements, the system can be installed within a sound-insulated internal compartment or mounted externally on the vehicle structure to address integration, noise and thermal-dissipation requirements.
Power8.9
kW
Configurable Power Architecture for Evolving Vehicle Loads
The broader APU architecture described in the supplied information supports configurations from 2 kW to 20 kW and can be tailored to higher capacities according to application requirements. It supports 24/28 VDC output as well as higher AC and DC voltage options.
The A21822 draws fuel from the vehicle fuel tank and initial electrical power from the vehicle battery, avoiding the need for a dedicated APU fuel tank or battery. Air-cooled or liquid-cooled diesel-engine architectures may be used depending on the application; the A21822 technical table specifically lists Water Cooled.
A21822 Auxiliary Power Features
Main-Engine-Off Power
The A21822 supports selected onboard systems without requiring the main engine to remain operational.
Silent-Mode Support
Independent auxiliary power enables reduced reliance on the main engine during low-signature stationary operation.
Co-Generation Capability
The APU can monitor vehicle power demand and supplement the main generator when additional electrical power is required.
Vehicle-Fed Architecture
Fuel is supplied from the vehicle tank and initial electrical power is taken from the vehicle battery.
Automatic & Manual Start
The control interface supports automatic and manual start options for different mission profiles.
Digital System Monitoring
The control unit displays operational parameters and fault conditions for operator supervision.
Power, Cooling and Control Configuration
Electrical Output
- Output Voltage
- 28 VDC.
- Continuous Power
- 8.4 kW.
- Output Power
- 8.9 kW.
Vehicle Integration
- Fuel Source
- Vehicle fuel tank.
- Initial Electrical Power
- Vehicle battery.
- Cooling
- Water Cooled according to the A21822 technical table.
Control & Monitoring
- Electronic Control Unit
- IP67-rated ECU with digital display.
- Start Modes
- Automatic and manual.
- Displayed Data
- Temperature, fuel level, pressure, DC current, battery voltage and fault conditions.
Operational Applications
Auxiliary Support for Vehicle Electronics and Mission Equipment
The A21822 can support onboard electronics, hydraulic and pneumatic systems, climate-control units, weapon systems, communication equipment, fire suppression systems, power distribution units and KBRN protection equipment while reducing dependence on the main engine.
In co-generation mode, the APU operates alongside the vehicle's primary generator, continuously monitors electrical demand and supplements available power when required. It may also be integrated with HVAC and KBRN protection systems.
Environmental, EMC, Electrical and Reliability References
The supplied product information states that the A21822 is designed and tested in accordance with the following military standards for electromagnetic compatibility, environmental performance, electrical power and reliability considerations.
Frequently Asked Questions
01What continuous and output power values are specified for the A21822?
The technical table specifies 8.4 kW continuous power and 8.9 kW output power.
02What maximum current is listed for the A21822?
The supplied technical data lists a maximum current of 330 A.
03What cooling system is specified for this APU?
The A21822 technical table specifies an integrated Water Cooled system.
04What noise level and system weight are listed?
The technical data specifies 69 dB @ 10m and a system weight of 163 kg ±20.
05What dimensions are specified for the A21822?
The supplied dimensions are 569mm × 536mm × 542mm ±5.
Technical Data
Need More Information About the Auxiliary Power Unit – A21822?
Contact our team for A21822 vehicle integration, auxiliary power, cooling and mission-system requirements.