4 RC Servos - How Much Current???

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Howdy, I've been meaning to test this for ages & in this video you'll find out how much current 4 or 5 standard servos like these bit.ly/2FfUJNx take. Crucially is a 3A BEC in your ESC enough? AND what about running at 6V instead, does that make a difference? FULL details below, Press SHOW MORE to see them, Matt
TowerPro MG90S Servos
================
The servos I am using are these ones bit.ly/2FfUJNx.
As noted I have now used over 150 of these with very few issues.
You can see these being taken apart in this episode • Remember that Duff Ser... (they have metal gears!) and a full review on them is here • Tower Pro MG90s Servos...
The Results
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4 Servos / 5.12V
- - - - - -
2.78A / 4 = 695mA per Servo
Max load. 2.78A x 5.19V = 14.43 Watts!!
5 Servos / 5.12V
- - - - - -
3.48A / 5 = 696mA per Servo
Max load. 3.48A x 5.19V = 18.06 Watts!!
4 Servos / 6.20V
- - - - - -
3.357A / 4 = 840mA per Servo
Max load. 3.357A x 6.20V = 20.81 Watts!!
5 Servos / 6.20V
- - - - - -
3.958A / 5 = 792mA per Servo
Max load. 3.958A x 6.20V = 24.54 Watts!!
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Опубликовано:

9 июл 2018

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Комментарии : 100

@RobisonRacing68 6 лет назад

This is really relevant to the scale guys too. There you have 3 retracts, 2 flaps, 2 aileron, rudder, elevator, steerable nose wheel and sometimes turrets etc. Let's not forget our pan and tilt assemblies. (Which I just heard you mention as I finished the video LOL!)

@RagTheNutsOff 6 лет назад

Hey Lauren, absolutely, upto 3 extra servos, yea that needs to be accounted for. Matt

@ovnimanable Год назад

Thanks a lot Matt! You teached us in one video what all of my professors didn't taught at college. Nice! you Sir, deserve respect.

@BenjaminK123 3 года назад

really handy to know, i built a robotic arm and i use 6 servos 3 of them are the MG996R and the other 3 are SG90 small servos but i am only giving 2A power and clearly this is why my servos go full on spacko due to lack of power :( thank you for sharing your results

@paulherder5356 6 лет назад

After this video I am upgrading all my large helicopters with the 20a BECs! 4 Standard size metal geared digital servos got to be pulling some amps along with the flight controller and the 2 (or more) Sat RXs. Most of my large helicopters have Opto ESCs so I already have separate BECs but will be checking to insure they are rated for enough amps. Thanks, Matt!

@RagTheNutsOff 6 лет назад

Howdy Paul, jesus yea! Heli's are bonkers and that is an excellent example where servos can and will hit max loads quickly. AND thats not something you want to be under powered on when it's spinning two samurai swords around either. Caution is definitely a good approach there Paul, Matt

@foamyflightmaster9385 6 лет назад

Great stuff Matt, this is a question that has been in the back of my mind for some time.

@jasearturo9181 3 года назад

i realize I'm kinda off topic but do anybody know of a good place to watch new series online?

@giorgiontanas8618 6 лет назад

Thank you so much for doing this, I built my first wing the other day thanks to your informative videos (and it flies great). iNav + omnibus f3, m8n gps and eachine vtx03 and 2 cheapo blue ebay servos, and I thought that my linear bec esc (rated for 2A) wouldn't cut it. So I went ahead and plugged my servos and vtx to a standalone 3A BEC. Looks like I was right so I can avoid the dreaded brownout/fc restart or even worse overworked/burning esc bec, thank you!!!

@RagTheNutsOff 6 лет назад

Giorgio, Happy Days! 👌 Matt

@julianhumphrey4843 6 лет назад

useful test, thanks for taking the time to do this

@RagTheNutsOff 6 лет назад

Thanks Julian, Matt

@Pilesofplenty 6 лет назад

Good to know! I have 6 servo BFG on the bench, shipped with a 30 amp esc and only has a 3 amp bec, larger servos as well!

@RagTheNutsOff 6 лет назад

Morning, yea same here! The daughter flies that one and she throws it around the sky at times too. I'm swapping mine out shortly, Matt

@martyhughes4724 6 лет назад

Interesting test and surprising results.

@RagTheNutsOff 6 лет назад

Hey Marty, agreed. I will be testing with a 3A BEC from a ESC shortly as well to see what happens. Matt

@dsingfsw 6 лет назад

Very useful test, thank you!

@loc4725 6 лет назад

Just so you know, multimeters _average_ the current draw, so instantaneous draw will probably be much higher and ideally you'd have an (os)sillyscope to meaure that. ☺ But that said, a switching BEC would probably be able to cope with the *occasional brief* overdrawing of amps as they have a charge pool, unlike linear BECs. Edit: Forgot to mention, the popular Hextronic HXT900 servos have been claimed to draw ~750mA *each* !

@RagTheNutsOff 6 лет назад

Morning Loc, yes a very good point! And those HXT900, I think I have two of those kicking around here, I'll try them out. Matt

@Morpheus852 6 лет назад

Thanks Matt, i am wondering, why nobody ever did such a test before:) very enlightening

@RagTheNutsOff 6 лет назад

Morning Morpheus, yea it's a curious one! Look out for part 2 shortly, Matt

@fhuber7507 6 лет назад

Some of us started testing before 2.4 ghz came out. Its simply that the test results never got noticed when we tried to tell people about them. 99.999% of Spektrum "brown outs" are caused by inadequate power being supplied to the RX and servos. (Someone might have had a brown out for some other cause, but they can't prove it)

@Willy_Tepes 7 месяцев назад

Great question. Thank you for answering it. It is a shame that stand-alone BEC's suitable for small aircraft seldom come in anything above 3 Amps. And even the ones with 3 Amps are fairly large if size is a consideration. Both the flight controller, VTX, GPS, Camera, DVR, LEDs and receiver also need juice. I found that an ESC with BEC is the best choice as they often have 3-5 Ampere BEC's built in. One option is to use a smaller servo if the extra power is not needed, like in a pan and tilt mechanism. 6g servos may be better for such use than 9g servos.

@nicktwinn6760 6 лет назад

Hi Matt, most of us fpv fixed wing fellas who fly with multiple servos probably use an autopilot which often provide power to the servos via their own power modules. Great eye opener though , love the delivery-lol!

@RagTheNutsOff 6 лет назад

Hey Nick, yea it's odd some builds I use the plane ESC and others a dedicated BEC. I must fit that 20A SBEC to the clouds after seeing the results in this video. It should give oodles of head room. Matt

@fhuber7507 6 лет назад

Just one "standard" servo such as a Futaba S3003 can pull 2 amps at stall torque on 4 cell AA NiCd. Higher power digital servos can demand MUCH more. You can not test one type servo and expect the results to be the same for all servos. You should be testing all of your servos Supply power as if expecting at least HALF of your airplane's servos to be stalled. ("3D" planes, can expect ALL servos to be stalled at once briefly in extreme aerobatics) For most servos with nylon gears, you can potentially strip the gears on 4 cell NiCd by preventing movement. Higher voltage does make the motor more powerful but it does not make the gears stronger. Use a weight on a long servo arm to load the servos for testing.

@RagTheNutsOff 6 лет назад

Howdy fella, yea I'm never likely to own any Futaba servos. I used these as this is what I have used in nearly ALL the builds in the past two years, Matt

@skinnyguy3184 6 лет назад

Hi Matt I've always wanted to know This!!! Great video

@RagTheNutsOff 6 лет назад

Morning, me too! There will be a part 2 where we look at the voltage and current used via a normal ESC. Matt

@benznote2342 6 лет назад

hmmm...i'm not the expert, but this experiment looks like we test a motor current draw but we not put a propeller in it, maybe you should measure when the servos attached with the control surface Matt

@RagTheNutsOff 6 лет назад

Hey Benz, yep that'll be part 2! Matt

@travispratt6327 3 года назад

It baffles me with the massive list of specs given with servos a current draw is never given. Perhaps the most important thing to match, i've overloaded becs and had multiple symptoms from receiver brownouts to blown escs. Receiver brownouts are the worst because if you don't have the experience you'd never suspect it was servo draw causing it.

@Migueldeservantes 6 лет назад

Really interesting test!! May you consider to do the test and check the Noise Level out of the Bec "May be putting close enough a Camera and Video TX to see the aftermath??? Since as you approach the max output of these ESC's Bec the switching power supply will start to scream bloody murder you are killing me"" Etc

@didactylos4diddy474 6 лет назад

It's an interesting test, but as you say most pilots aren't going to achieve such extreme loads on all of the servos at once. But again, as you say, adding multiple servos means that giving yourself a _little_ more safety by upgrading the BEC is probably a good idea. Especially if you are ragging the nuts off a model :)

@RagTheNutsOff 6 лет назад

Morning fella, yea thats my point, we didn't know how much current servos could take before, hence why I did this test to see wtf was going on. Wil ldo a part 2 as well, to follow up on a couple of things, Matt

@mostlyharmlessrc3920 6 лет назад

Good investigation Matt! Larger servos pull more amps of course, so it's not just about numbers of servos. 👍🏼

@RagTheNutsOff 6 лет назад

Howdy fella, yea I enjoyed that one, look out for part 2 shortly as we'll look at this further, Matt

@andreyl2705 Год назад

Thanks for test.

@accelmovedynamics5224 2 года назад

thank you very much... it was very usefull.

@PerchEagle 5 лет назад

Well, first thanks for the test. Hmm I'm working on a servo now, using arduino library, but I think is that the servo should take current even if it's in rest, but I think that's normal to keep the servo in position. So I should feel some pulses in rest position. But what about if the sevos get warm at rest position, is that normal too?

@NoAgendaFPV 6 лет назад

Great info

@RagTheNutsOff 6 лет назад

Thanks! Matt

@azhanisyahputra9867 Год назад

Thx u so much sir, u taught us what we didn't earn in college ;)

@markm5479 6 лет назад

Matt's Test Lab, NICE...

@markm5479 6 лет назад

Or, Matt's Pixie Smoke Palace...

@daveeastcott9323 Год назад

When calculating this for BEC etc, I think it might be important to consider that this is all at a no load situation whilst in the air, the forces on the servos will increase the current draw. At least that's my understanding... Might be a better idea to test to test one servo with some luggage scales for resistance and then multiply after all...this will give a more accurate worst case scenario for current draw though I guess it's unlikely you'd ever be putting maximum force on all servos at once... Either way interesting vid so thanks and the wiring concept was useful- that's what I was after! 👍😁

@triananta7267 5 лет назад

I've been using 4 nylon servo towerpro SG90 with flight stabilizer and 200mW VTX gear AIO and FS-i6 flysky receiver, the 3A 5V from BEC is enough for the job and the plane flew smooth and stable. a few month ago I replace the nylon servo with the metal gear servo towerpro MG90 just like the one you use here, but then the servo movement jitters, I change them to nylon towerpro SG90 and everything back to normal, so IMO the towerpro MG90 draws more current than towerpro SG90.

@SladkaPritomnost 5 лет назад

SG90 is analog, your mg90 might be digital, however I tested one of these and I actually didn't find them digital... but hard to say from CN you can get anything...

@tedhancock68 6 лет назад

I wanted to try the mystery yellow ESCs, after flashing to SimonK, on ultimate cheap builds using Flight Test plans and Dollar Tree foam board. With those having a 2A BEC, now I'm not so sure. I really wanted to do some total cost < 20 USD models, but I doubt I'll be able to keep them in the air.

@RagTheNutsOff 6 лет назад

Howdy Ted, I know the ones, I set one on fire the other week with too many amps through the motor. Up until then, it was surprisingly OK. Give it a punt and see what happens, Matt

@jackiewang7725 4 года назад

2A BEC is enough if you don't have more than 4 micro servos. I tested on my KT foam plane. About 1.2 A max. That mystery yellow ESCs are just doing their works as expected. If you find that sometimes you lose control. Then it's highly possible that the BEC overloaded. You can also choose to use a separate BEC.

@paulg5437 6 лет назад

If you dont block the arms and set it on cycle what do you get? for minimum load at full movement

@brianblogg645 6 лет назад

Hi Matt good test but I would like to see the test done with an actual 3amp bec while monitoring voltage and current at the same time to show just how bad things can get.

@RagTheNutsOff 6 лет назад

Hey Brian, thats not a bad idea fella, round #2 !

@dutchmetalmaniac 6 лет назад

good point, i think the voltage sag is is gonna cause a brownout because the 3 amp is running on it's toes, the 20 amp in the test from matt has an easy job. still good test tough.

@ScouserStreamz 6 лет назад

Is the yep a good bec then to buy rather than use buikt in bec

@tedhancock68 6 лет назад

Very helpful video. The 20A was a crucial test to show what the servos can actually draw without brownouts or failures involved. But, yes, a repeat with typical 2A, 3A and 5A BECs would answer the "real world" questions.

@rtoebak76 4 года назад

Yes you would, me to🙂🇳🇱

@CrisMadla 4 года назад

So I have 12 35kg cm servos would I need like 12 amps?

@Ouch. 6 лет назад

If you stall all the servos they will clearly draw loads of power....It's hard to say what's really going on here. I would be interested to see what would be going on if your circuit included the motor and the reciever. Your experiment gives a good ballpark figure, but a current sensor in a model when the control surfaces are under real air pressure with your control surfaces are at full deflection in a dive or other violent manouvre. Good fun though!

@RagTheNutsOff 6 лет назад

Howdy Keith, absolutely, looked out for part 2 where we'll explore this further. Matt

@fhuber7507 6 лет назад

I've done the in flight testing, and have pulled 15+ amps servo power in flight in a .91 glow powered model, not doing 3D. I forgot which servos were used, but they were all the same 90 in-oz rated. 2 aileron servos, 1 rudder, 1 elevator and throttle. No retracts or flaps or other optional controls. I moved to 120 in oz on ailerons, 2 X 90 in-oz on elevator and one 250 in-oz on rudder; Hitec Digital servos and dropped max current logged to 11 amps, going through the same aerobatic routine. (AMA Sportsman Pattern sequence from appx 10 years ago) 15 amps was the max the current logger I had would read...

@ismailtaiwo2034 3 года назад

I have been having serious issue with getting my servo current i wan to use 5sg90 servos and 2Mg966r servos. Wan to know the current so i can know the power supply to use. Your vide has realy helped me alot. Thank u very much..but stil need help

@Ammothief41 6 лет назад

Nice. Coming from the quad side of things should we be adding some capacitors to the servo power rail??

@RagTheNutsOff 6 лет назад

Hey Jason, it'll help as they're mini batteries. However normally in quads you're adding a capacitor to smooth the power supply for the FPV gear. Matt

@fhuber7507 6 лет назад

Capacitors are a solution to only appx 1/10 second of high servo power demand. Quad copters that have no servos will have no flight loading of the RX system.. it takes very little power for the RX side of the ESCs

@simonwood8685 3 года назад

I know it an old video... But I have had two matek 411wse boards go bad.. One was in a bixler2.. With 4 servos... Some have said that they wouldnt use a 411wse in a model with more than 2 servos.... Would it be possible for me two run servos off the board.... And run two from the bec in the esc... Getting the signal for those two from the board.... Then I would have 3amps per two servos... Would that work?

@Woodsywoodsy-sj9qy 6 лет назад

So I'm building an S800. is the mateks 5v @ 2000ma enough to run 2 servos. What if it exceeds the 2k.

@RagTheNutsOff 6 лет назад

Howdy fella, "should be fine" as it'll be two servos and a receiver on the 5V line. See if your ESC has a better bec in it and if it does, use that instead, Matt

@Woodsywoodsy-sj9qy 6 лет назад

RagTheNutsOff nice one for a reply m8. I'm using spares I have for quads & only have blheli 20a. I have added a cap. This is my first wing & I been watching your videos. So it would work but be better if I got an esc with a BEC. To lighten the load. Or I got the pdb & BEC that comes with it. You have to Solder them together Could I just put that bec on its own on the lipo pigtail with the capacitor. & power the servos that way. Cam on 5v & vtx on 12v. Thanks again look forward to future vids.

@RagTheNutsOff 6 лет назад

Morning fella, try it and see how it does is probably the best answer. There are good 3A BEC's available on BG or a dedicated plane ESC with a BEC in are normally perfectly fine. Plus it;s a wing, so only 2 servos and a receiver. Matt

@Fr35HPR1NC3 6 лет назад

Whats a servo for your visor? What does your visor do?

@RagTheNutsOff 6 лет назад

Morning fella, see this video for it in action ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xqM00YgLptc.html it's to keep moisture from blurring up the camera, Matt

@jameslamb4573 6 лет назад

Please buy some crocodile/alligator clip test leads, lol

@RagTheNutsOff 6 лет назад

Ha, I had some once upon a time

@SighKick 6 лет назад

Matt, this is assuming that all servos reach max at the same time. How many servos are moved to Max Stall in reality?

@RagTheNutsOff 6 лет назад

Morning SK, absolutely! We're testing worst case scenario here to see what happens at the max, that way we can account for that during our builds. Matt

@fhuber7507 6 лет назад

an electric powered 3D aerobatic model can stall all servos in flight at once. (throttle servos rarely stall in glow or gasoline models if the linkage is set up correctly... you can stall anything else with flight loads)

@PerBuch 6 лет назад

Max load and quick movement and, even higher amp draw.

@nigellark 6 лет назад

It would be interesting to know how much current a servo draws when it is moved quickly, but you would have to have the equipment to measure peak current. Max load, however, is usually when the servo is stalled, and therefore not moving. You can't have a servo moving quickly and stalled at the same time. Stalled is not moving (in this case stopped by a block of wood).

@dhakshingk 4 года назад

If a BEC is rated for 20 amps, how many amps can you give it through the battery? I am doing a project (GCSE dt), and I was worried if I gave a 10 amp 12v power supply to a 20 amp BEC. Will this be fine?

@RagTheNutsOff 4 года назад

Howdy, it would have been fine. You'd be mortified what we do to LIPO batteries in the air ;) Matt

@dhakshingk 4 года назад

@@RagTheNutsOff thankyou so much for replying to a comment on a video 1 year old. Thanks, I needed that, no website tells you this kind of info

@joeclone2686 6 лет назад

Hey Matt, how bout paralleling becs? Do a vid on tat, lets see some pixie smoke.

@RagTheNutsOff 6 лет назад

Hey Joe, lol that is asking for trouble, maybe wire them up black to red, stand back and see what happens? 🔥😇 hahahahha Matt

@dutchmetalmaniac 6 лет назад

well Matt, 8 servo's in a plane that's quite something. i think you'll have to caary a car battery in it to power all those. ;))

@RagTheNutsOff 6 лет назад

HAHHAHA indeed Pete! Matt

@fhuber7507 6 лет назад

I'm building a plane that will take 8 120 in-oz servos for flaps...

@magnuswootton6181 2 года назад

its even worse for a hexapod, they have 16 servos alot of the time and they are virtually always still. makes me wonder how long even lipo batteries last for...

@AnasSuhaimi 3 года назад

Actually for the 9g-16g servos, when pushed to the max, ie at stall torque, they typically draws between 3-5.5.5A EACH Watch this guy's video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-w3VWWmJSKo4.html So to be safe, put 1 BEC for each of your servo to cover the worst case scenario.

@mustakrakish6614 3 года назад

thanks man, you just answered the biggest question. Now I need a 20Amp buck :D.

@lesliecompton4061 6 лет назад

cant help thinking you just put a target on why most crashes occur apart from tree bashin

@b00sted_mx59 6 лет назад

"genuinely fake"

@RagTheNutsOff 6 лет назад

Hey Kanaan, yea I heard that saying in Turkey, it's always made me laugh 😁, Matt

@skypilot23 6 лет назад

Spit it out comon you can do it! I thought one of my new servos you pitched had a crooked shaft at first- whew! don't know what I was seeing they seem to all be good $2.40 servos On the test- if all the servos are jammed full on that's a highly uncommon flight condition isn't it?

@RagTheNutsOff 6 лет назад

Morning, see todays RC Coffee chat (episode 209), it's perfectly possible to trigger all the servos at the same time, say in a fail safe condition where a flight controller takes over and resets everything. Matt

@EnglishTurbines 6 лет назад

Is it me, or did you have all / some of those servos in a stalled condition against that block of wood?....and you are surprised at the current they are pulling?....Im not. I tend not to have blocks of wood preventing servo movement in my models....what are you trying to prove Matt?

@JoshWeaverRC 6 лет назад

EnglishTurbines. Safety. Prepare for the worst, hope for the best. That's my guess. Hopefully we never reach the worst.

@JoshWeaverRC 6 лет назад

On my 2.1 m Cessna 150 Z, on landing, have 2 flap servos, 2 aileron servos, vertical and horizontal stabilizer servos a working at once. I noticed the 80 amp Yep esc has a 6 amp bec.

@RagTheNutsOff 6 лет назад

Morning ET, good question, simply "worst case scenario". Look out for part 2, I'll address the feedback from this video and explore this further, Matt