GPU1500/40 Twin - Starter unit - 28 V DC

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The GPU 1500/40 Twin will deliver 80A continuous output when connected to utility power making this unit ideal for maintenance and lengthy pre-flight checks.

Typical applications:

  • Protect the on-board batteries
  • Several starts per day
  • Take off reliably



Size and weight are important considerations for hand-portable aircraft start units. Situations exist where additional battery capacity and performance is required while retaining the essential benefits of mobility or ‘hand-portability’.

Designed in collaboration with Powervamp, AERO Specialties has solved this issue by connecting two units in parallel to create the GPU 1500/40 Twin.

The GPU 1500/40 Twin can be split into separate modules for ease of transport and is designed to be carried on board for emergency power or turbine starting. This aircraft start unit is suitable for starting larger helicopters and business jets where larger turbines or turboprop aircraft require higher instant amperage and longer start cycles.

Each GPU is supplied with a power supply LED output monitor for load monitoring and diagnostics, and can be re-charged via its accessory port by any 24–28V DC aircraft power source, including the aircraft 28V DC bus connector.

Each GPU 1500/40 is fitted with solid state voltmeter with ‘push to view’ button to monitor battery voltage. A spring-loaded output cover ensures the aircraft start unit is cleared for air transportation. Supplied with Nato lead set, input leads and heavy-duty canvas protective jackets.


  • High powered sealed lead acid AGM batteries

  • Cleared for air transportation
  • 80A, 28V DC Internal power supply/charger
  • Power supply LED status indicator
  • Corrosion resistant aluminum case with carry handle
  • Controls protected by twin front protection bars
  • Spring-loaded output connector cover
  • Auxiliary socket for plug-in accessories
  • Solid state voltmeter with ‘push to view’ feature
  • Fitted with rubber anti-slip, shock absorbent feet
  • Double trolley
  • Heavy-duty canvas protective jackets


Peak amps:** 4800A

  • Nominal voltage batteries: 24V DC/power supply 28V DC
  • Standing voltage: 25.6V DC
  • Amp/hour capacity: 52 Ah @ 10 hr rate (68° F [20° C])
  • Operating temp: -40° F to + 113° F (-40° C to +45° C)
  • Case: Aluminum with shock absorbing feet
  • Voltmeter: Solid state LED, IP65
  • Aircraft cable: 6' (2m) with heavy-duty rubber Nato connector
  • Output current: 80A (with internal power supply)
  • On-board charger: 4 x 20A internal power supplies
  • Input voltage: 100–132V AC or 200–264V AC/45–400Hz single phase
  • Cooling: Forced ventilation
  • NSN: 2990-99-6117404

** Peak amps is a theoretical calculation of the instantaneous current from a momentary dead short across the battery terminals. It is not representative of the power delivered at the aircraft plug due to cable losses and other factors. This figure is only shown for comparative purposes.

GPU 1500/40 GPU 1500/40 Twin
Voltage 28 V
Continuous current 40 A 80 A
Power 2400 A 4800 A
Capacity 26 Ah 52 Ah
Weight 26 kg 64 kg
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