6 kW (Electric) 8 kW (Hydraulic) Auxiliary Power Unit

Overall APU

Exterior dimensions (L × W × H): 800 × 660 × 830 mm
Gross weight: 195 kg
Electrical output: 6 kW @ 28 VDC
Hydraulic output: 8.0 kW (9 GPM @ 1800 PSI)
Rated current: 210 A @ 28 VDC
Engine type: Hatz Diesel 2G40, two-cylinder, air-cooled
Fuel type (Diesel): JP8, DF-1, DF-2, DF-A, NATO fuels F-34, F-35, F-44, F-54
Fuel consumption: ~2.27 liters per hour

Generator System

Type alternator: Internal rotor permanent magnet
Alternator speed: Variable, 2200–3000 rpm (0–6 kW output)
Output voltage (nominal): 28 VDC

Operating Parameters

Temperature range: –32 °C to +55 °C
Altitude: Sea level to 1,200 m
Sand and dust: Per MIL-STD-810F
EMI compliance: Per MIL-STD-461E
Protections: Reverse polarity, overcurrent, overvoltage, overspeed, overtemperature, low oil pressure, emergency kill switch

Our newly developed Auxiliary Power Unit (APU) is designed to deliver reliable electrical and hydraulic power to heavy vehicles in the field. It provides backup support for the M88A2 Hercules Heavy Recovery Vehicle, as well as power for refueling and fuel transfer operations. The APU can also be used as a portable 28 VDC and hydraulic power source.

The unit offers three operational modes:

Idle Mode – Low noise, low fuel consumption standby condition
Generator Mode – For charging battery packs
Hydraulic Mode – To support the vehicle’s hydraulic power requirements

A permanent magnet generator and hydraulic pump are mounted directly on the flywheel of a Hatz 2G40 two-cylinder air-cooled diesel engine. This design eliminates the need for belts, chains, or additional bearings, ensuring durability and reduced maintenance.

The Electronic Control Module (ECM) manages voltage, current, idle speed, start/stop functions, protection, and diagnostics through CANbus communication.