28vDC Power Supply | Ground Power Units | Power Systems International

Carina House East, Sunrise Parkway,
Milton Keynes, MK14 6LS, United Kingdom

28v DC Power Supply for Aircraft

The Power Systems International Series of mobile 28vDC power supply systems are designed for aircraft engine starting and battery charging applications.

Its applications extend to: “point of use” at aircraft parking stands, in maintenance hangars or in avionics workshops, aircraft manufacture and training simulators where a rugged heavy duty and reliable isolated DC power source is required.

This mobile power system is designed for connection to the normal 50Hz (or 60Hz) 3 phase 400V mains source. Producing an output of 28V DC to provide all types of helicopters and small aircraft with a high stability power supply for charging on board batteries.

These systems can also deliver a current-limited, short duration peak power output for engine starting.

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Power Systems International offer a wide range of 28vDC power supply units, split into three main categories:

– The DD range, designed for rugged uses, such as offshore installations (combination only)

– The PS Range suitable for hangar and outdoor use (Continuous, Starter and Combination)

– The SP Range, which is integrated into our 400Hz product (combination only)

Benefits of these 28VDC Power Supply
  • Minimal audible noise, no vibration or toxic exhaust fumes or environmental pollution as produced by diesel driven systems.
  • This series of mobile power units is designed to deliver the aircraft engine peak starting current of up to 2,400A.
  • Our products will keep the battery fully charged whilst the aircraft is on the ground. Thus, reducing battery stress and preserving the life expectancy of on board aircraft batteries.

Useful information


The standard DD series 28V DC ground power unit is constructed in an all welded sturdy press formed steel enclosure.

It is rust inhibited and painted in colours and finish to suit individual customer requirements.

The converter enclosure upper section top is fitted with handling bars at each end for one person positioning, the base frame section is fitted with lockable swivelling wheels.


The PS range is smaller and lighter and designed to be positioned as close to the aircraft as possible.

The series also comes with wheels and rugged handles for manual handling.

The unit comes with a longer 50 or 60Hz input cable, and shorter output DC cable to reduce the considerable costs and weight of DC Cable.


The SP range is designed to offer the most flexibility where the aircrafts could required 400Hz power or 28vDC. This also comes in static and mobile options.

All units can be offered with a stainless steel casing, for the harsher environments.

The units can also handle a wide range of operating environments, with temperature ranges of -20c to +60c, and come with IP ratings of up to IP54.

Downloads & Resources

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28V DC Helicopter Engine Start Systems

Filetype : pdf
Filesize : 583 KB
Uploaded : 27/07/2022
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Filetype : pdf
Filesize : 220 KB
Uploaded : 27/07/2022
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