The MEP-531A unit is a 2kW continuous-run diesel generator powered by a modern single cylinder air-cooled Yanmar engine. It operates at 3600 RPM to help save on weight and size.  These units can easily run between 3,000 and 5,000 hours before a rebuild is needed.  The MEP-501A variant is a 28vDC (Direct Current) generator. This unit is ideal for recharging batteries in a solar/wind system.

MEP-531A – MEP-501A Specifications

Identification Data
Description 2 kW MTG Set, 60 Hz, DED, Tubular Frame 2 kW MTG Set, 28 VDC, DED, Tubular Frame
Model MEP-531A MEP-501A
NSN (first buy) 6115-21-912-0393 6115-21-912-0392
NSN 6115-01-435-1565 6115-01-435-1567
LIN G36237 G36169
SSN M59400 M59400
Physical Characteristics
Dimensions LWH (in) 30 x16 x 22  (Cube: 6 ft3)
Wet Weight (lbs) MEP-531A: 158 MEP-501A: 138
Engine Yanmar L48AE-DEG Diesel, 1 cylinder/4 stroke, 4.2 horsepower @ 3600 RPM, air cooled, 24 VDC start from NATO slave receptacle, recoil pull starter.
Instrumentation Voltmeter, ammeter, hour meter, frequency meter (AC only).
Fuels Diesel DL-1, DL-2 and JP-8
Fuel Capacity Fuel tank: 1.6 gal.
Performance Characteristics
Power Rating 2kW, 1.0 pf @4000 ft/95°F. 110% Max power; derate: 1.3%/328 ft from 4000 to 8000ft
Environmental Capability -40°F to 120°F, rain, humidity, altitude, sand/ dust, rail transport, -65°F cold storage, salt spray, fungus, 15° incline
Protective Devices Trip circuit breaker for overload/short circuit. Automatic shutdown for low oil pressure.
Fuel consumption 0.33 gph @ rated load. 0.33 gph @ rated load.
Human Factors MIL-STD-1474: 4 soldier portable: operable in chemical/arctic clothing.
Noise 79 dBA @ 7 meters (23 ft).
Reliability (MTBF) 818 hr 490 hr
Maintenance Ratio 0.033 – organization; 0.008 – direct support.
Electrical Characteristics
Voltage Connection 120 V, 1 phase, 2 wire 28 VDC, 2 wire
Voltage adj. Range 114 to 126 V 26.6 – 32.0 V
Freq. adj. Range ±5.5% N/A
Electrical Drip proof generator enclosure, fungus & moisture treated, solid state voltage regulator, brush type 2 pole alternator, solderless connectors, AC alternator: Mechron Power, DC Alternator: Balmar.
Electrical Performance
Electric Power Quality AC Voltage Frequency DC Voltage
Regulation 4% 5.6% 4%
Voltage modulation 2%
Short term steady state stability (30 sec) 2% bandwidth 3% bandwidth 2% bandwidth
Long term steady state stability (4 hr) 4% bandwidth 3% bandwidth 2% bandwidth
Application of rated load (transient), recovery time 30% dip,3 sec, 8% undershoot,4 sec 30% dip,1 sec
Rejection of rated load (transient), recovery time 30% rise,3 sec 10% overshoot,5 sec 40% rise,0.5 sec
Motor load not rated
Max waveform deviation factor 16%
Individual waveform harmonic 15%
DC ripple 7%
EMI Meets MIL-STD-461C  Not Protected
EMP Not protected.
Optional Equipment
Description NSN Weight (lbs) Effect on Dimensions (in)
Auxiliary Fuel System See TM 9-6115-673-13&P
Technical Manuals
Description Army Air Force Marine Corps
Operator, Unit, DS/GS, Parts TM 9-6115-673-13&P TO 35C2-3-512-1 None
MEP531A-MEP501A Dimentions
MEP531A-MEP501A Dimentions


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