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Dealing with massive voltage drop

Posted by Tobi Fly on June 23, 2015 at 1:49pm 
Hi everyone,
 
I'm using the pixhawk (px4 firmware) on a DJI  F450 with the 3DR power module (accurate readings) and Turnigy 3s  2650mah batteries.
 
I've set BAT_CAPACITY to -1 for now because I want it to only consider voltage readings.
BAT_V_EMPTY is set to 3.6V, BAT_V_FULL is set to 4.2V
 
I  experience massive voltage drops (>1V per cell on full throttle)  when I increase throttle. This causes the pixhawk to go Battery failsafe  mode and battery critical mode after just a few seconds eventhough the  voltage recovers to normal values after throttle is decreased (allthough  it takes much longer till normal voltage is displayed in QGC compared  to my volt meter).
 
I've set BATTER_V_DROP to 1V but still the  same result. Maybe its a problem with the batteries, on the other hand  they do work just fine.
 
What can I do to get this under control?
 
Thanks

PS: Sorry again for accidentally using group send message to post this >.<

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Tags: px4, pixhawk, voltage drop
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  • Admin
    Thomas J Coyle III June 23, 2015 at 2:45pm

    @Tobi,

    Get a battery with a bigger C rating than the one you are using to help keep the voltage from drooping at high current demands.

    Regards,

    TCIII AVD

    • Tobi Fly > Thomas J Coyle III June 27, 2015 at 11:44am

      Hi Thomas,

      yea the batteries I use now probably aren't perfectly suited for the application but over all they can handle it. With a C rating of 25-30C they certainly can deliver the current.

      So any other workarounds i could try?

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