Hi planning a 4 week cross country flight around the perimeter of South Africa. Will be doing some VLOGing.  Was wondering what limitations there are on how many USB charging points you can connect to the 914 charging / battery system? I currently have 2 cigarettes lighter type USB 4A chargers and would like to install another 2. 



  • Re: Charging Capacity

    by » 6 months ago

    Section 2.1 of the installation manual says that the generator can provide 250W @ 5800rpm. Section 2.2 says that the maximum current is 22A but there is a mximum temperature of 80 degC allowed on the regulator, so that may be the limiting factor.

    Depending on your existing electrical load you can work out how much spare capacity you have. You may also want to monitor the temerpature of your regulator at various stages of flight to see that you are not approaching the 80 degree limit. Alternatively you can buy temperature labels to stick on the regulator that will record the maximum temperature.

    If you are only connecting a few GoPro type cameras then I wouldn't worry as the power consumption is less than 3W each.

  • Re: Charging Capacity

    by » 6 months ago

    The short answer is, "Don't even worry about it."


    The long answer is...

    4 amps is the capability of the chargers on the USB end at 5 volts.  (20 Watts) ...  Not what the actual draw from the Generator will be.

    20 watts on the ~14v bus side is less than 1.5 A.

    And that is only if what you plug into it is using it to the absolute Max capacity.

    A Tablet, Cell phone and 2 GoPro's will be drawing less than 1 amp from the generator.

    As was stated earlier, "Don't even worry about it."



    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is appreciated by all.

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