back up power

Hello everybody,

I was wondering if it is possible to configure servo rail for back up power, I have read this sentence on this wiki page and the real matter is that I can't really figure out how can I configure this feature.

To be honest the word configure sounds a little misleading to me, I mean it is something that I can do through Mission Planner or just connecting a power subbly (Bec)

The confusion has grown in me when I read that servo rail can supply power up to 10 V (more or less), but If power goes beyond 5.7V pixhawk will reboot, so here the only thing I can accept is that somehow it is possible through Mission planner telling whether using the port or not for back up.

I'm not really intrested on using devices recquiring such a power, in my system I have a camera which needs 5 V and to accomplish the demand I have used an external 5V bec and a zener diode.

The system is just good.

But if this feature is configurable I wouldn't need for example for the zener diode, am I wrong?



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  • I haven't looked at the link referenced by Bill however, I will say that your approach to backup power is one of hardware not software configuration.

    You should be thinking "If my power module/port" fails then ______________

    There are a couple answers. one that I have used is a simple 3A 5 volt BEC powered by a 3s LiPo connected to the backside rail. Use a zener diode in another free spot to protect any voltage spike on the rail.

    Unplug the Flight battery and your Pixhawk should stay online, done.

    (This scenario only covers if your power module/port fails)

  • Developer

    try on the forums at if you haven't already.

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