My long-flight-time quad (APM 2.6, or Pixhawk) is a specialized aerial survey platform using 4S4P unprotected NCR18650B Li-Ion batteries. I have been using Afro Slim 20A ESCs successfully, but I want to be certain that they will not pull more than 3C of current from the battery. Theoretically, these ESCs could pull 80A during a max climb. I can eliminate this possibility by setting the climb rate conservatively, but are there other conditions where overcurrent could occur?
I'm only considering normal flight, not crash conditions such as impact or extremely high wind.
I believe that the ESC current rating means that it cannot drive a motor beyond that current draw at the max PWM command, correct? I want my system to be unable to burn out my battery (3C, 13600mah) during stabilization and I can set climb rates to be conservative. However, can I be certain that the only condition under which maximum battery current draw will be during climbs? What about maximum roll correction?
Since the battery is the limiting factor in this equation and finding the maximum ESC rating allowable is the result, motor/prop/weight can be ignored for now.
In essence, "Could my 20A ESCs burn my battery during stabilization in autopilot mode?" "Would using 10A ESCs be the best choice for max motor thrust while limiting the chance for battery overcurrent?"
Could I set the firmware to not draw more than a set current from the battery?