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Rugged Vehicle DC to AC 20 Amp AC Electrical Power

High-quality AC power designed for rugged commercial and military vehicle use. The Espey MS-28-120AC-2500 inverter provides safe reliable power with no derating up to 50C ambient temperature. A sealed enclosure and waterproof fan allow for meeting fording and wash down requirements while also preventing electrical hazards in the event of water exposure. 

Electrical Output Ratings

  • Output power: 2.5kVA
  • Peak output power: 2.5kVA
  • Output Voltage: 120 VAC nominal
  • Output THD: 3% max
  • Load Regulation: 5%
  • Output frequency: 60 +/- 0.5 Hz
  • Power factor: up to 0.70
  • Crest factor: up to 2.5
  • Efficiency: >80% Nominal

Electrical Input Ratings

  • Nominal input voltage: 28vdc
  • Input voltage range: 20-33vdc
  • Input protection: MIL-STD-1275D spike and surge protected

Safety/Performance Features

  • Isolation: > 1 MegOhm input to chassis and output
  • Hi-pot: 500VDC output to input
  • Reverse input polarity – keyed connector/proper wiring required.
  • Overvoltage, over current and over-temperature protection
  • Fault indication LED (Optional capability for CAN, J1939)
  • Grounded or ungrounded neutral


  • MIL-STD-461-F, CE102, CS101, CS114, CS116, RE102, RS103 ground vehicle. (with use of shielded cables)
  • MIL-STD-1275D input spike and surge protection

Mechanical/Environmental Specifications

  • Size and Weight: 8.9 x 8.5 x 15.4 (in. W x H x L) 38 Lbs.
  • Degree of Enclosure: IP-67 sealed enclosure
  • Operational Temperature: -46°c to +50°c
  • Storage Temperature: -40°c to +85°c
  • Connectors: Circular mil Amphenol GT series
  • Vibration: MIL-STD-810g, method 514.6, Procedure i, annex c, category 4  
  • Shock: MIL-STD-810g, method 514.6, Procedure v, crash hazard shock
  • Humidity: 20-100% RH condensing
  • Coating: Conversion coating, MIL-DTL-5541, type 1, class 1a (CARC paint optional)


  • Demonstrated performance in military ground mobile operations ensures reliability in military and ruggedized commercial applications.
  • IP67 (dust-tight, 1-meter water immersion) enclosed with forced-air cooling (sealed wind tunnel design)
  • Simple automatic fully operational start-up within 5 seconds when input voltage is applied. Optional engine start delay (Avoids inverter load on battery until after the engine is started)
  • AC output connector Interlock (allows operation only when AC output connector is mated)
  • Configurable for isolated or grounded neutral output
  • MIL-STD-810 ground mobile environment
  • Output short circuit protected
  • Automatic recovery from output overload or short circuit

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