• October 25, 2018 at 11:36 am #13460
    Jimmy Oliver
    Participant

    I am bench testing a dual battery Mauch system with a Pixhawk 2 (hexacopter). The percentage bar is dropping quickly and I am not flying. I have AMPS and VOLTS added together and divided by 2. I had the AMPs just added together but it didn’t seem right so I changed it. What am I missing?

    October 26, 2018 at 3:14 pm #13502
    Thomas Lauzon
    Keymaster

    Hi Jimmy,
    If you have your ESCs on, that would drain the battery.
    Make sure you follow this:

    You can calculate the total setting for Batt1 monitor in MissionPlanner:

    Voltage divider = (Voltage divider sensor 1 + Voltage divider sensor 2) / 2

    Amp/ Volt = Amp/V Sensor 1 + Amp/V Sensor 2

    November 2, 2018 at 12:15 pm #13534
    Jimmy Oliver
    Participant

    The volt sensor adds up to around 124 volts? It doesn’t seem right? (125.48076 v) Do I divide the voltage?

    November 2, 2018 at 1:29 pm #13536
    Thomas Lauzon
    Keymaster

    could you send me the calibration values from your sensors, or alternatively the serial numbers?

    November 2, 2018 at 1:57 pm #13537
    Jimmy Oliver
    Participant

    ME-83584 ME-83574

    November 2, 2018 at 4:19 pm #13538
    Thomas Lauzon
    Keymaster

    So in Mission Planner you need to use:
    Voltage divider: 26.77749
    Amps per Volt (A/V): 125.48076

    The Pixhawk expects a voltage on its analog input that represents the current read by the sensors. For example, if the current sensors report 2V to the Pixhawk, that actually means that the current measured by the sensors is: 2V x 125.48076 A/V = 251 Amps

    November 5, 2018 at 11:51 am #13549
    Jimmy Oliver
    Participant

    First test flight has very poor results with percentage bar plummeting resulting in 5 minute flight. I usually get 26 minutes from this setup. Not sure why due to following the above instructions. I am using Pixhawk 2 with Mauch Dual Power system.

    Here is the flight video:
    https://www.dropbox.com/s/tjovf83u56rh6wl/MauchPowerTimeFail.mov?dl=0

    Here is pic of battery percentage after flight:
    https://www.dropbox.com/s/obpkh386k8jqb0r/20181104_132801.jpg?dl=0

    Please let me know if you have ideas or if you need flight logs.

    November 6, 2018 at 7:14 pm #13559
    Thomas Lauzon
    Keymaster

    From your battery gauge it looks like you still have a significant level of battery capacity left. I think the best would be to check your battery failsafe level on the failsafe page. You could also send us your parameter file -> [email protected]

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