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Inaccurate amperage display

Posted by Jim Johnston on August 15, 2013 at 5:08pm

I am using the following voltage and current sensor on my quad copter with APM 2.5 running firmware 3.0.1 because the DIY drones one does not support 6S setups:  http://www.rctimer.com/product_861.html

I have it connected as per the old wiki:  https://code.google.com/p/ardupilot-mega/wiki/Voltage

I have set the battery capacity in the MinimOSD to 5800mAh as I am using Zippy 6S 30C 5800mAh batteries.  I went for a flight this evening using a low voltage alarm on the battery set at 3.3V/cell.  According to the OSD, I depleted my battery to -3%, however according to my iCharger, I only put back 2322mA into the battery, or approximately 40%.

Can anyone help me figure out what such a discrepancy?

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Replies

  • RickP August 17, 2013 at 10:09pm

    I imagine you need to play with the constants (VOLT_DIVIDER and AMP_PER_VOLT) to get the right voltage and current shown. The % figure shown in the OSD is the sum of current over time, so if the current shown is wrong, the mAh used will also be wrong.

  • Jim Johnston August 17, 2013 at 6:20pm

    Is there not anyone who can shed so light on this?

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