Can I use an ESC with a bigger amp rating with my motor?

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[paulg]

The only problem I've noted using a much bigger ESC (apart from its weight) is it may be set for a higher number of cells than you plan to use (example: a secondhand ESC set for 6S when you only use 3S). This can cause strange problems like the motor not running at max or the ESC cutting out before the LIPO is down to its lower voltage limit. So always check its battery cell count with a configuration card or the (frustrating) music beep method.

[OpaFPV]

Great video. I use the same term when I explain the Motor-ESC-Battery system, that the motor PULLS current through the ESC from the battery. Also, great recommendation to always have 20% excess capacity in the ESC. Thank you!

[hamshackleton]

I'd prefer to put a Wattmeter in line between the battery and speedo, for bench testing. Using e-calc or whatever is all well and good IF everything is to the spec it claims, but there is always that rogue motor that draws a lot more than it should - especially if the ground has jumped up and hit it!

[pir]

This is sort of something i want to delve into a bit more, I'm a total noob to fpv, but i'm an electronics technician.

Your right that the motor will draw what it needs as far as current is concerned, the voltage fed to the motor will always be peak battery voltage as that's how pwm works.

I have the idea that the ESC input signal from the flight controller will be the same no matter what flight controller is used as this is basically a power conversion ie low signal power to high drive demand.

Even all in one controllers can have the onboard ESC parts removed to save weight if external ESC units are fitted.

I am looking at some older drones that have 2s 20c rated batteries a hubson 501, it has separate ESC units, my thought is change out the ESC units to higher current rated types, also upgrade the motors, even if a conversion plate is needed for the new motor to mount to new screw holes using the old screw holes to hold the conversion plate.

Fit bigger props, use a larger cell count battery with a higher C rating for faster spool time, and also maintain the original flight controller board and or the Vtx voltages with a smps buck converter or a linear regulator.

To get a higher drive power, longer range with a lighter body .

My issue is with the C rating, even just changing out the 2s 7.4v battery of 20-30c to a higher C rated battery what if any issues could arise, i don't see a problem, i just foresee a drone that might be a bit zippier, or the motors "might" over heat, but again they "the motors" should be more than capable of utilising a more available current source, therby allowing again a faster spool up time, if anything the higher C rated battery would be under less stress and or heating due to the lower internal resistance not causing thermal runaway from current demands.

Please let me know what you think of my ideas, i was going to build a drone but if i can start with a partially built item ie strip out either low rated ESC or onboard ESC and motors, a bit like not using a cheap pc all in one video/sound card and opting for separate items to plug in, when people did that.

Also i'd take the heatshrink of of any controller and add heat sinks to the mosfets then seal the electronics with either a conformal coating spray or the silicone rubber solution for electronics use, in case any one reading this bathroom silicone rubber is no good as it gives off acetic acid(vinegar) and will eat away copper like ferric chloride used to etch pcbs, fish tank silicone is fine too as it too does not give of nasty copper or fish killing nasties.

Sorry for the length of this, but i wanted to convey the full idea of my proposed plan clever or dumb, i think it could be done and i may yet cannibalise a cheap ebay drone preferably analog as i have a EV800 box viewer.

Subscribed and enjoy the vids.

[MCsCreations]

Thanks for all the tips, Lee! 😊
Stay safe there with your family! 🖖😊

[maxun]

100 % correct Lee, but the prop motor KV is super important, if you overprop the motor specially in hi KV motors, the motor will get hot degrading over time the lacquer of the motor in the best case or melting the lacquer, making a short in the stator windings and burn the esc. So a balance combo is golden.

[jamesemery]

Good advice as always. I learned the hard way with rc cars when I was a kid, popped quite a few esc's before i figured it out lol. Stay safe Lee

[LiftVector]

I just stuck a 30 amp ESC into my latest FT Mini Arrow with an EMAX MT2204 2300kv motor/6inch prop. Bench testing results made me chuckle. Thing is going to rip at 360 grams!

[ADF_Cable]

Absolutely!
I like to have a slightly bigger esc than required.
I liken it to doing 60 miles on the highway, you don't want to be redlining your car motor, you want to be cruising.
Same also applies for hifo amplification, best to have more power in the amp than speakers are rated for for cleaner sound

[richarddorsch]

Great explanation! Other utube videos only confused me. Thank you!

[gabcwabc]

I was on the same page as this here, but then I have burned out 2 motors with ESC's 50% larger (all with recommended batteries and propellers). Then with the latest new motor, when hitting the throttle, the motor would immediately stall. Down to the rated ESC and works fine. It makes me thing that some motors will pull more amps then they can consume without damage.

[TradieTrev]

Couldn't we use a clamp meter to measure the ESC for what it draws? Been having a bit of a play with some DC ceiling fan motors and it totally fascinates me how similar they are compared to what we use for quadcopters and scooters. In fact most are rated 24v and for a bit of fun it I reckon we could use a flight controller ;)

[MarkoMarkovic-ckpg]

Good evening,

I'm new to the RC world and am currently building one of my first few bait boats. So if you can answer my questions, that would be very very helpful and I would be very happy. So, I have 2x 12V 6800rpm brushed motors, 12V 7.2AH gel battery. I bought two 12V 320A ESC-s. And my question is, would the ESC-s be “overkill” and would they drain the battery faster than, for example, a 2x 12V 40A ESC-s or does that have anything to do with it?

Kind regards

[jmiskinis]

I have not yet constructed the drone that I painstakingly acquired parts for starting in 2016 or so. But, after watching some YouTube videos, I was not sure if I made a mistake in purchasing ESC devices that were rated for the same current as my motors, as several videos stated that is advisable to use ESC devices rated at (Approx.) 20% above the motor rating.

[im_gldn]

is there a way to accurate test the actual current draw from a motor. I bought some 2807 motors rated at peak 55a but its still blowing up my ESCs.

[kevinduprey]

Random question... I see people buying battery packs for ebikes with different amp specs. Is it possible to have device that simply would electronically change volts ? From say 48a to 60a ? Assuming you have capable battery.. Similar to chip in vape mod with wattage adjustments?

[navinsingh]

I had the same question, I was worried that higher rated ESC will provide too low a resistance and won't regulate the current going to the BLDC motor. In reality, that is only a problem if you are using a higher voltage than the BLDC motor is rated for, or when the motor is running at max power and it heats up before the ESC heats and reduces power to protect the circuit.

[avici]

Hello Sir,
I have brushless motor with 1250KV and maximum current is 70 and in the data sheet mentioned for 70 ESC, my question is can I use 40 Amp ESC for my motor just to test it?

[gunbusterSMSTI]

I just recently got an RC boat and this answered a lot of my questions however doesn’t the certain cell battery also affect how much the motor pulls? That still don’t get and I wonder if if you have a video about. Because say at 2S it might pull 20 A and it’ll want that full 40. Unless that’s not how it works.😂

[GhostRyderFPV]

Adding "duty cycle" to my drone-speak is Sexy!
Right? Anyone? Echo echo echo...

Now lets us show the opposite: a 50A 2207 with a 15A ESC: Engage Safety Squints and Pepsi Extinguisher!