How to choose the right Ground Power Unit (GPU)
Explore the key selection criteria
Choosing the correct Ground Power Unit (GPU) depends on your aircraft’s voltage requirements,
operational environment, and mobility needs. In this guide, we’ll break down the key technical
and practical aspects to help you make an informed decision – whether you’re equipping a
maintenance hangar, a remote airfield, or a major international terminal.
Contents
Before you pack your bags: Let’s cover the basics
There are aircraft that use Alternating Current (AC) and others that use Direct Current (DC).
Your home typically uses 50Hz or 60Hz AC. But most large passenger aircraft require AC at 400Hz – a frequency standard agreed upon in aviation to enable lighter onboard generators.
In contrast, your car runs on DC. The alternator generates AC power, which must be converted to DC to charge your battery and operate onboard electronics.
Similarly, most helicopters and small jets use 28.5V DC systems, powered by batteries and ground power.
↓ So far, so good? Let’s keep going ↓
Looking for a reliable 28VDC power solution?
Discover our advanced rectifiers, designed for small aircraft, helicopters, and sensitive avionics systems.
Find the right GPU for your aircraft model
Great! So just like your home, an airport or hangar will typically have 50–60Hz AC power. However, aircraft require different standards – AC needs to be converted to 400Hz, or rectified to 28 Volts DC, as per aviation regulations.
So now you know — depending on your aircraft, you’ll either need a 400Hz Converter or a 28VDC Rectifier. But how do you know which one is best for your operations? That’s where we help.
We’ve prepared a helpful chart that matches various aircraft types with the most compatible ElectroAir Ground Power Units. Whether it’s a helicopter, regional jet, or long-haul aircraft – this guide will point you in the right direction.
Do you need an Air Starter Unit (ASU)?
When it comes to powering up your aircraft, it’s important to know the difference between a GPU and an ASU. Many aircraft in well-maintained condition do not require an Air Starter Unit – which tends to be heavy, high-maintenance, and costly to operate or repair.
Electric or diesel-powered GPUs are typically 4 to 12 times more cost-effective than traditional ASUs and offer greater efficiency, portability, and reliability. Before investing in an ASU, consult your aircraft’s manual or ground handling team – chances are, you may not need one at all.
A few more important details
If your Ground Power Unit needs to be mobile or located on a remote stand, you’ll want a diesel-powered or battery-powered hybrid model, with a cable input or an electric-hybrid configuration. If your needs are for a static setup, consider installing a unit under a jet bridge, inside an underground pit, or within a hangar.
Other factors to consider include the required load capacity, cable length, number of outputs (based on aircraft types), socket configuration, custom branding (logos, color), delivery address, and logistics. All these can be addressed directly with our team of experts.
📩 Contact our sales team – [email protected]
See all of our Ground Power Units
Explore our full range of aircraft GPUs and support systems, including diesel, hybrid, and electric models for various operational needs.
Choosing the right manufacturer
When selecting a Ground Power Unit, you’re not just buying a machine — you’re choosing a long-term partner for your operations. Look for manufacturers that offer certified components, proven reliability, and responsive support.
Consider factors like warranty terms, response times, production origin, and how accessible the team is for consultations or spare parts. A good manufacturer will stand behind their product and provide service throughout its lifecycle.
Thank you in advance for choosing ElectroAir!
Why choose ElectroAir?
Award-Winning Design
Recognized by Estonian Entrepreneurship Award as top engineering innovator.
In-House Production
Made in the EU with high-grade certified components and scalable customization.
Reliable Support
Dedicated 24/7 support, flexible delivery, and warranty policies.
Trusted Worldwide
Used by civil airports, military bases, MROs, and airlines in over 40 countries.
Stay tuned, stay inspired and we’ll see you around the world!
