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Ground Power
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   Safe, Affordable
   Airframe Power for
   Ground Operations

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 How to Choose a GPU

 Mini-GPU Tutorial

                 How to Use the
          White Lightning Mini GPU

 BatteryMINDer Built-In
            Advantages of a built-in
       battery maintenance charger
                  and maintainer

[Image for M2850]
50A 28V Ground Power Unit
50-amp 28-volt GPU with 3-pin Oval Plug
Model M2850 - New!

[Buy Online]
$1195.00 USD
    • Output meter shows volts & amps
    • Overload alarm and auto-shutdown sequence
    • Heavy duty 6' output cable - SB50 to 3-pin AN2551
    • Universal Input: 90-264 VAC  10A 47-63Hz.
    Aircraft Spruce - GPU details         Sporty's Pilot Shop
    Categories: Aviation Mini-GPU, Aviation, Aviation 24V-GPU

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    [Front view]
    Front view
    [Rear view]
    Rear view
    [Input cord]
    Input cord

    Attention: FBOs, dealers, shops & OEMs -- Call 800-322-8346 or e-mail sales for quantity purchase information.


    Safe, Affordable, Airframe Power

    The M2850 Mini-GPU is a specialized switching-mode power supply designed to provide pilots and aviation maintenance professionals with a portable, affordable source of stable, high-current, noise-free DC power that replicates the in-flight electrical environment. Its rated output is 28-volts up to 50-amps (approximately 1500 watts). The GPU’s intended purpose is to energize an aircraft’s main electrical bus without using the ship’s battery or engine. It will safely provide continuous power for the most delicate electronics and airframe systems up to its full rated output.

    Typical Uses
    • power avionics for flight planning, familiarization, and training
    • update flight deck database and software
    • troubleshooting and maintenance


    GPU Features

    • Color-coded, keyed SB-50 type output connection to prevent accidental voltage mismatch. RED designates 24/28 volt compatibility.

    • Digital output meter shows voltage and amperage (load)

    • Front panel status indicator LED

    • Programmable auto-shutdown timer and dual USB power ports for mobile device charging

    • QuietFilteredTM output for interference-free COM radio operation

    • Auto protection/recovery from short circuit, reverse polarity, over voltage/load/temperature




    • Input Voltage: Universal 90-264 volts AC, 47-63 Hz
    • Input Current: 17A @ 115 volts AC
    • Input Protection: 20A circuit breaker, cycle ON/OFF to reset
    • Output: 28.50 +/- 0.25 VDC, 50 amps max cont.
    • Output Cable: 4 AWG, SB-50 to 3-pin oval AN2551 (NATO)
    • Chassis Dimensions: 6.4” H x 5.32” W x 14.63” L
    • Carry Weight w/cables: 17 lbs
    • Carton Dimensions: 10” H x 10” W x 18” L
    • Shipping Weight: 18.3 lbs


    Audio Authority® authorizes this device for use ONLY by aviation professionals, such as licensed pilots and maintenance technicians, knowledgeable about their aircraft electrical system and batteries. The operational concepts, recommendations, and instructions presented in our manuals are necessarily general and make assumptions that do not apply to every aircraft, and may not be correct for your particular aircraft. Incorrect use of this device has the potential to damage the GPU and/or aircraft components. It is the operator’s responsibility to read completely and fully understand the included manual, plus those sections of the Aircraft Flight Manual and Maintenance Manual that pertain to their aircraft’s electrical system design, to determine the appropriate use of this, or any, external power source. If you cannot do this, do not use this product. Instead, consult the airframe manufacturer or a technician familiar with your specific aircraft type and configuration before connecting the GPU to your aircraft.


    The Model M2827 provides 28-volt DC power for:

    • avionics demonstration and testing
    • database and firmware updates 
    • flight planning and cockpit procedures training 
    • troubleshooting and maintenance  
    • powered pre-flight inspections and battery top-off charging


    Frequently Asked Questions

    Q: Can I use the M2850 to start an aircraft engine?

    A: No, the M2827 GPU is not adequate for piston or turbine engine starting and should be used for airframe systems power only. 

    Q: How does the M2850 connect to my aircraft?

    A: The Model M2850 Mini-GPU includes a 6’ output cable with a 3-pin oval AN2551 plug that connects the GPU to the aircraft. 

    Q: Can I use the M2850 to charge my battery?

    A: The Model M2850 Mini-GPU is not designed for long-term battery charging. It has no circuitry for monitoring the battery’s state of charge or determining the precise charging voltage for various battery conditions and ambient temperature. So, the general answer is no. However, for short periods of time (an hour or two), the GPU’s output can be used to “top-off” the charge of a battery that is NOT serverely discharged. This is particularly useful during a powered preflight, allowing the pilot to take his/her time to check every airframe system and lights for proper operation without depleting the starting battery. 

    To optimize battery capacity and reliability, we highly recommend full-time, maintenance charging desulfation, and recovery. Our preference is the aviation-specific BatteryMINDer products by VDC Electronics. The BatteryMINDer is designed to remain connected for long periods of time, and will never overcharge or damage your battery.

    Q: Does the GPU work outside North America?

    A: Yes, the input voltage and frequency ranges are very wide and universal for worldwide operation: 85-264 VAC, 47-63 Hz. The AC cord supplied is a North American grounded 5-15P to C19, 12GA, which can be adapted, or replaced with an appropriate cord, sourced locally.


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