esc rating? what does it mean?

[aeronautical]

hi all. just wanna ask, esc comes with like 18,25,30,50 etc amp ratings. what does it mean? what are the benifits of using a higher amp rating? thanks

[SKYHOBBIES]

it is use to withstand the intake of total/max curent draw of your motor and battery, eg if your lipo battery is 10C 1250 mah, at full throttle with prop attached, it should draw constant 10C x 1250mah = 12.5 amp. With this an 18 amp ESC is sufficient... and so on. Also please take into account the max surge burst which can be higher than the batteries current "C" rating.

Regards,

[aeronautical]

wow. ok thanks. so supposing you use a 50 amp esc but only needs 15 amps, then does it mean that there will be any wasted energy? thanks

[genexis]

nope, just that it will be an overkill to use the 50 amp esc for a 15 amp circuit. Normally it is alright, but for electric planes and helis, it will be a problem because big esc = heavy.

[aeronautical]

ok thanks for the info! will take note of that

[Super-Hornet]

There are certain reasons why using higher than needed ESC for the job.

Why? Because normally for the same brand, higher model category has better/more feature than the lower model.

Take example, Castle Creations PHX-35 has feature of running higher frequency than PHX-25 or lower. PHX-45 and above has High voltage series. Quark 40 (Is it 40? So long as higher than 33) can supply more current for more servos for its BEC.

With that, so long as your aircraft (airplane, heli or whatever plane) can carry it and u can afford it, I don't see any reason not to use better model.

SHornet

[aeronautical]

oh ok i see. thanks alot

[yongteck78]

Hi Guys,

I have the same question on ESC rating too and hope someone can give some advice.

I am using a 30A ESC with a motor that allows max permissible current of only 14A. If let said i would to put full throttle for 9 seconds, will it kill the motor?

Lets assume that the prop size used is the recommended size for the motor.

Thanks.

[jansonfinn]

Hi Guys,

I have the same question on ESC rating too and hope someone can give some advice.

I am using a 30A ESC with a motor that allows max permissible current of only 14A. If let said i would to put full throttle for 9 seconds, will it kill the motor?

Lets assume that the prop size used is the recommended size for the motor.

Thanks.

Theoretically, no

[yongteck78]

Theoretically, no

Good to know that thanks.

[jansonfinn]

Good to know that thanks.

Forgot to add that the number of the cells used must be within the specs for the motor n esc

[yongteck78]

Forgot to add that the number of the cells used must be within the specs for the motor n esc

Yes, all within specs, only thing is the the ESC amp is higher.

[blueangel]

ESC amperage - should be higher than maximum amperage drawn by the motor you used.

Battery amperage-hour rating - its continuous amperage supplied must be more than that of the ESC's amperage.

Simply :
Battery mAh > Esc max A > motor Max A

[yongteck78]

ESC amperage - should be higher than maximum amperage drawn by the motor you used.

Battery amperage-hour rating - its continuous amperage supplied must be more than that of the ESC's amperage.

Simply :
Battery mAh > Esc max A > motor Max A

Cool, that means higher ESC AMP and battery AMP rating will not burn the motor...

Current setup:

Battery: 1500mah, 20C
ESC: Hobbywing 30A
Motor: FSD 2830-980KV, Max Permissible Current is 14A

[Super-Hornet]

Higher Battery + ESC WILL BURN your motor...if u overload the motor.

If Higher Battery + Higher Motor power, u WILL BURN ESC if u overload it.

SH