Hello everyone,
I’m currently building a 15-inch quad for research purposes in a university lab, with the following configuration:
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Pixhawk v6 Mini
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DakeFPV 100A ESC Dshot
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MAD BSC 4720 FPV drone motors
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Battery: Tattu 22,000 mAh
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GPS Holybro M9N
I’m running into the following problem:
When I arm and increase the throttle, the aircraft cannot take off even though the motor directions and order are set correctly. At full throttle it lifts slightly, then suddenly loses power and falls down (I notice that the Pixhawk reboots). In many cases, even just arming causes the ESC to fail. The 4700 µF input capacitor on the ESC has swollen and had its leads break off multiple times.
Since I haven’t been able to fly yet, I don’t have any logs, and I also don’t know whether the cause is hardware or software. I’m also wondering: in theory, the ESC should be more than capable of handling the motor load, but I don’t understand why the ESC fails so easily.
I tried connecting an oscilloscope to measure the battery discharge current while controlling the motors manually in the Actuators section of QGroundControl. At low percentages, the output current is fairly stable; however, when I increase the motor percentage higher, the current occasionally drops out intermittently to zero.
So if anyone has encountered a similar situation, I’d really appreciate some advice. 
Or if anyone has a good, proven standard configuration for a 15–18 inch quad, please share it with me as a reference, because I’m not sure which brands are reliable 
