How big ESC do I need?

May 2024 · 5 minute read
If you are using 30amps ESCs, you should choose motors that are bigger than 2205 or faster than 2300kv, and propellers should be bigger than 5 inches. For examples 30 amps is required for the 2204 2700kv, 2204 3200kv, 2205 2700kv or 2206 1900kv(with 6 inch propellers).

What size ESC should I use?

The ESC can be selected based on the voltage and the peak current rating of the motor. A simple rule is to choose an ESC with atleast 5A more capacity than the peak rating of the motor, since you may be powering servos, receiver and other accessories from the ESC.

How do I choose the right ESC for my motor?

The first thing to look at when choosing ESC is the current rating, which is measured in Amps, therefore sometimes referred to as “amp rating”. Amp rating is never too high, only too low.
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Current Rating

  • Higher motor KV.
  • Larger motor size (stator width and height)
  • Heavier propellers (length and pitch)

    • Can an ESC be too big?

    Realistically, no. There's some minor variation in efficiency between ESCs and it's possible an ESC will need its timing adjusted to work well with the motor. But even that's unusual, they're almost always plug and play.

    How many amps do I need for my ESC?

    The ratings on an esc and battery are usualy a "max" value. If we believe the numbers then your cell is safe up to 44 amps and the esc is safe up to 35 or 60 amps.

    How to choose your ESC amp rating. Are modern ESC's over-sized for our use?

    Does ESC amp matter?

    A high amp esc will usually have better internals than a lower amp esc. Keep tthe questions coming, you do not learn without asking! Amp rating generally means you can run a more aggressive motor (mod motors) with higher amperage. For example, the Hobbywing Justock is just a 45a ESC.

    Can I use any ESC with any motor?

    Short answer is no. Not all brushless esc's are compatible with all brushless motors.

    What does a higher amp ESC do?

    Having a higher amp-rated ESC simply means your ESC will be less stressed and run cooler! You always want your ESC to only run at ~80% of rated max.

    Do I need a new ESC for a brushless motor?

    Yes, you need a brushless ESC for a brushless motor. You need an esc that can handle the current that the motor pulls. Just the fact that it says its rated to 14 amps means that it will work up to 14 amps.

    Why do ESC burn out?

    Current too high. Battery voltage too high. Not enough cooling.

    What is a 4 in 1 ESC?

    A 4 in 1 brushless ESC allows you to move ESCs from the arms of your quadcopter into the centre stack with your flight controller. Compact builds can benefit, as they make wiring a lot simpler, removing the need for a power distribution board and separate BEC in some cases.

    What is the best ESC?

    Top 5 ESCs for FPV quadcopters

    How much power does ESC draw?

    the ESC was rated for 10A but the motor drew 15A at full throttle, limiting maximum throttle to 67% might drop battery current to 8A but motor current would be 12A, still over the ESC's rating.

    What ESC do I need for 4S?

    What size ESC should i use on a 4s setup? The ESC should be a match to the motor , and both should be rated to handle 4S . I find the max amps the motor can handle and get esc over that by 20 amps. I would at least consider a switch-mode ESC or consider an external BEC.

    What amp ESC do I need for 3S?

    A quality 60A ESC will be fine on 3S...within reason, and as stated above with weight/motor kv concerns.

    How many amps does an RC car use?

    Around 60-80 amps. "How many Amps does a typical 540-size 4000-5000kV Brushless motor draw on 2s? I know it also depends on gearing, but gimme an idea." Around 60-80 amps.

    Can you burn out a brushless motor?

    There is in a sense no break in for brushless motors, if the poly coat insulation on the winding is going to fail it will practically right away.

    Can you mix and match ESC and motor?

    For the most part, yes, you can. A few things you have to consider...in most cases, you can't run a sensored motor on a sensorless ESC for example. Mostly you have to make sure the ESC can handle the motor wind or KV.

    Can I use different ESC on quadcopter?

    Can we use a different brand ESC in that quadcopter or multicopter? The answer is, it might work, but not recommended. If you are desperate to fly, then by all means, you can try mixing any combination of ESCs and props that have somewhat similar characteristics.

    What is a brushless ESC?

    Brushless ESC systems basically create three-phase AC power, like a variable frequency drive, to run brushless motors. Brushless motors are popular with radio controlled airplane hobbyists because of their efficiency, power, longevity and light weight in comparison to traditional brushed motors.

    Do you need an ESC for a drone?

    Due to the differences in motor technology, different ESCs are required for drones with brushed motors and those with brushless motors. Multirotor drones may have an ESC for each rotor, or an integrated device that handles all the rotors with one system.

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