MEP531A 2kW Military Diesel Generator

$5,250.00 $1,999.00

Since 1996 Dewey Electronics has been manufacturing and supplying the standard 2kW Military Tactical Generator to the US Department of Defense’s PM-Mobile Electric Power (PM-MEP).  This is the sipper of all sippers that we offer at GMG and only consumes .333 gallons per hour at 75% load.  This is also the most portable of all of GMG units, weighing in at 152 pounds (full of fuel).  The MEP-531A generator utilizes a current Yanmar air-cooled engine. Parts are readily available.  These units are excellent for extreme portability and fuel conservation.  They are desirable for truck-mounted systems, very remote off-grid living, or home-standby if space is a major concern.

These compact, portable, highly reliable, lightweight units are available with either 120V AC or 28V DC output and have established themselves as the mainstay of portable power for military applications worldwide. Their open frame configuration allows them to be easily lifted, stacked, or transported by any military vehicle. This open configuration contributes to the ease of maintenance for which these units are noted.

Equipped with a manual recoil starter and the ability to be electrically started from their NATO Slave Connector, these units are used throughout the military where pure military power is a requirement or when portability is a necessity.

NOTE:  Some MEP-531A units have been stripped of their fuel systems (tank, filters, lines). In this case, and you can see examples in the product photos, GMG rebuilds a 100% new fuel system complete with new tank, new lines, new filters, new roll-cage around the tank, fuel shut-off and strainer.  This retrofit fuel system is as-good (if not better), than milspec.  Please see photos for the retrofit fuel system. When purchasing, please email us and we will tell you if the unit you will purchase has the retrofit kit or not.

Below you will find MEP-531A Specifications:


Generator Set:

  • Manufacturer: Dewey
  • Model: MEP-531A
  • NSN: 6115-01-435-1565
  • Dewey Part Number: 95-531
  • Output Voltage: 120V AC
  • Output Power: 2.0 kW @ 4000 ft/ 95°F
  • Frequency (Hz): 60
  • Speed (RPM): 3600 to 3750
  • Phase: 1


  • Fuel Capacity (Gal): 1.6
  • Fuel Consumption (GPH): 0.333 gal/hr @ 75% full load
  • Fuel Requirement: Diesel-1, Diesel-2, or JP-8
  • Note:  Some units have a brand new retrofit fuel system (tank, filters, lines, shut-off valve, screen).


  • Length (in): 29.5
  • Width (in): 16
  • Height (in): 21.7
  • Volume (ft3): 5.9
  • Weight (lb): Dry: 123.5
  • Weight (lb): Wet (with 4 hrs fuel): 152


  • Manufacturer: Yanmar
  • Model: L48AE-DEG
  • Type: 4 Cycle
  • Cylinders: 1 vertical
  • Cooling: Air
  • Displacement: 12.88 cubic inches (0.21L)
  • Horsepower: 4.2 @ 3600 RPM
  • Compression: 19.9:1
  • Starting System: Manual recoil pull starter/ 24 V DC electrical via NATO Slave Receptacle
  • Decompression System: Manual type with auto-return lever


  • Manufacturer: Baldor
  • Type: Brush

Electrical Characteristics:

  • Voltage Connections: 120V AC, Single Phase, 2 Wire
  • Voltage Adjustment: 114 -126V AC
  • Terminals: Split Lug Load Terminals (L/N)
  • Receptacle: GFCI Duplex 15 Amp

Protective Devices:

  • Circuit Breaker: Overload/short circuit trip/engine shutdown (120V @ 20 Amps)
  • Low Oil Pressure Switch: Less than 15 psi/engine shutdown


  • Voltmeter: 100-130 V AC, +/- 3%
  • Ammeter: 0-125 % of rated load, +/- 5% rated load
  • Frequency: 55-65 Hz +/- 1% rated frequency
  • Hour Meter: Electro-mechanical

Performance Characteristics (Per Mil-Std-633):

  • Noise: 79 dBA @ 7 meters (23 ft)
  • Humidity: 0 -100%
  • Fungus: Drip proof electronics enclosure
  • Salt Spray: 5% Salt Solution
  • Sand/Dust: 1.4 g/m3 32.2km/h (20 mph)
  • Solar Radiation: 355 BTUs/ft2 per hour
  • Storage Temperatures: -65°F to 160°F
  • Rain: 100 mm (3.9 in)/ hr (3 hours exposure last hour operational per Mil-Std-705, ™ 608.1)
  • EMIC: Mil-Std-461C

Operating Environment:

  • Temperature Range Nominal: -25°F to 120°F (-32°C to 49°C)
  • Temperature Range Extreme Cold: -46°F (starting -40°F)
  • Temperature Power Derating: 3%/18°F above 95°F
  • Altitude: Sea level to 8000 ft
  • Altitude Power Derating: 3.5%/1000ft above 4000 ft
  • Inclination: 15° Max.

Dewey Specification Sheets:


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