Auxiliary Power Unit – A20F
A20F / AUXILIARY POWER UNIT
Auxiliary Power Unit – A20F
Auxiliary Power Unit – A20F is an onboard auxiliary power system developed to ensure continuous operation of armored military vehicle systems when the main engine is switched off or operating under limited conditions. Designed for high operational flexibility, the A20F enables electrical power supply, onboard climatization, and sustained system readiness under demanding mission environments.
Developed to support continuous onboard power, silent operation and system readiness without relying on continuous main engine operation.
Independent Power for Mission-Critical Vehicle Systems
Auxiliary Power Unit – A20F is designed to provide electrical power to a vehicle’s electrical, pneumatic, and hydraulic systems without relying on the main engine. It supports critical onboard systems during pre-mission preparation processes such as weapon testing, system diagnostics, and main engine cooling.
In emergency scenarios where the main engine is damaged or unavailable, the A20F enables selected systems to remain operational, preserving vehicle capability and mission continuity.
Platform Compatibility and Deployment
The A20F is developed for integration into a wide range of military platforms, including tracked and wheeled armored vehicles, tactical and support vehicles, and stationary military systems. Compatible platforms include main battle tanks, infantry fighting vehicles, armored personnel carriers, MRAP vehicles, and similar armored configurations.
The system can be installed internally within sound-insulated compartments or externally on the vehicle structure, depending on acoustic, thermal, and spatial requirements.
Architecture 2–20
kW
Power Architecture and Operational Flexibility
Auxiliary Power Unit – A20F addresses increasing onboard power demand driven by modern electronic and mission systems. It supports silent mode operation with reduced acoustic and thermal signatures while minimizing main engine operating time.
The system supports power configurations ranging from 2 kW to 20 kW and can be tailored to higher power capacities based on specific operational needs. It provides 24/28 VDC output as well as high AC and DC voltage options. Depending on the application, the APU may be configured with air-cooled or liquid-cooled diesel engine architectures.
Key A20F System Features
Main Engine Independent Power
Supplies power to vehicle electrical, pneumatic and hydraulic systems without relying on the main engine.
Stationary and Mobile Operation
The A20F can supply power both when the vehicle is stationary and while it is in motion.
Silent Mode Support
Supports reduced acoustic and thermal signatures while minimizing main engine operating time.
Co-Generation Capability
Can operate alongside the vehicle’s main generator and compensate for power shortages caused by newly integrated equipment.
Scalable Power Architecture
Supports configurations from 2 kW to 20 kW and can be tailored to higher power capacities based on operational needs.
Automatic and Manual Start
The electronic control system supports both automatic and manual start options for flexible mission operation.
Power Supply and Co-Generation Modes
Stationary Operation
- Condition
- Vehicle stationary
- Function
- Independent onboard power supply without continuous main engine operation.
- Support
- Pre-mission preparation, diagnostics, weapon testing and main engine cooling.
Mobile Operation
- Condition
- Vehicle in motion
- Function
- Maintains uninterrupted power during repositioning or convoy operations.
- Benefit
- Supports continuous mission system operation during movement.
Co-Generation
- Operation
- Works alongside the vehicle’s main generator.
- Monitoring
- Continuously monitors power demand.
- Purpose
- Compensates for additional electrical loads without requiring main generator upgrades.
Mobility and Co-Generation Capability
A key characteristic of the A20F is its ability to operate both when the vehicle is stationary and while in motion. This capability enables uninterrupted power supply during repositioning or convoy operations.
The A20F also supports co-generation mode, operating alongside the vehicle’s main generator. By continuously monitoring power demand, the system compensates for power shortages caused by newly integrated equipment, eliminating the need for main generator upgrades.
Control, Monitoring, and Smart Functions
Auxiliary Power Unit – A20F is equipped with an IP67-rated electronic control unit featuring a digital display. Operators can monitor real-time system parameters including temperature status, fuel level, pressure values, DC current, battery voltage, and fault conditions.
The control system supports both automatic and manual start options, allowing flexible operation based on mission profiles and vehicle status.
Application Areas
Military Environmental and Electrical Qualification
Auxiliary Power Unit – A20F is designed and tested in accordance with the listed military standards. Testing according to these standards verifies the system’s suitability for sustained use in harsh military environments.
Functional Role
Auxiliary Power Unit – A20F enables armored military vehicles to operate mission-critical systems independently of the main engine. It supplies power to onboard electronics, hydraulic and pneumatic systems, climate control units, weapon systems, communication equipment, fire suppression systems, power distribution units, and KBRN systems.
By reducing engine runtime, supporting silent operation, and enabling power availability during movement, the A20F enhances operational endurance, vehicle survivability, and mission effectiveness across diverse military platforms.
Frequently Asked Questions
01 Can the A20F operate while the vehicle is in motion?
Yes. The A20F is designed to supply power both when the vehicle is stationary and while it is moving, supporting continuous mission operations.
02 How does the A20F support uninterrupted power during convoy or repositioning?
By operating independently of the main engine, the A20F maintains power availability to onboard systems during vehicle movement.
03 Is the A20F suitable for vehicles with expanding mission system requirements?
Yes. The system supports scalable power configurations and co-generation operation to compensate for additional onboard electrical loads.
04 Does the A20F reduce dependency on the main engine during extended missions?
Yes. By supplying power independently, the A20F reduces main engine runtime, lowering fuel consumption and mechanical wear.
05 How is operational control managed during dynamic mission conditions?
The A20F uses an IP67-rated electronic control unit with automatic and manual start options, enabling reliable control during both stationary and mobile operations.
Technical Data
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