Do you really need a BEC or better ESC for your servo? Volts and amp outputs measured
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- čas přidán 30. 06. 2024
- Volt and amp outputs of popular ESC's are measured. Castle BEC is set to 6v. Hobbywing 1080 is set to 7.4v
Hobbywing 1080 - snp.link/edca1249
Castle BEC - snp.link/753b661b
All Castle BEC's - snp.link/4315df5a
Castle Micro X - snp.link/901cc293
Castle Mamba X - snp.link/36a68e45
Hobbywing Axe - snp.link/66905b2f
All BECs - snp.link/ae281904
Buy your kits and upgrade parts from this Amainhobbies link to support RC Review: snp.link/6640d084
Join the RC Review Facebook Group here: / 302319827122846 for early videos and extra footage. - Krátké a kreslené filmy
Thank you kind sir, you deserve an award from the CZcams Rc community for this one!
welcome
Another great vid!
The big problem long term is the heat created inside the internal BEC. Sure, a stock esc may output the amperage required, but amps are what create torque and create heat. On a trail run, many of the lower cost ESCs will either overheat or completely fail from the constant load that rock crawlers present. It's not so much "if", but "when".
Great input. I can actually measure this. Stall a servo 100x and measure the temp of an an ESC.
Make it smoke!!!
@@RCReviewChannel yes, either measure the temp giving 1 second bursts every 5 seconds (or whatever duty cycle you choose) or simply watch the amp stability and voltage output over a few longer cycles. It won't be pretty for any of them except maybe the mamba and axe. Not sure what the axe really has inside, but the mamba is pretty stout BEC.
It's nice to see that mr. John Holmes not only makes videos he actually watches other people's videos. I think that is really cool
HolmesHobbies Hey guys i’ve got a dual BR Mini TorqueMaster- Holmes Hobbies with a 10 a Castle Creations BEC and I keep going through servos so i’m looking at buying the Savox Servo - Sav-Sb2290Sg. The BEC is probably about 3 -4 years old would it still be working correctly
You're AWESOME!!! You must be reading my mind lately. You saved me a munch of money and aggravation. Now I know what I need for my servo needs and do I need a Bec for my traxxas line up of vehicles. You are my Top CZcams channel!!! Thank you so much 👍👍👍👍👍👍👍👍👍😀
The weird thing is I’ve read a spec sheet for an xl5 HV that rated it at 1amp also! I was really surprised and reassured seeing it pull 3.5amps since I’m running stock still. Thanks so much for all your valuable info.
These latest servo/BEC/esc videos are really nice. Thanks for the technical information.
Hopefully, these will help people for a long time.
Super helpful as I was on the fence about needing a BEC or not. I'll still probably go that route so I have the ampere overhead to add light bars, winches etc down the road, but to be able to upgrade my servo right off the esc is great to know!
Servo black magic explained! Got to Love it!
OMG !! what do you have for us now ? Answers, Answers and more great answers to really good questions.
Thank you again.
Right on. The answer is...unless you have a monster servo, no need for a BEC or monster ESC.
Great test! Thanks for doing this! I think it would be good to run the test again, and measure the voltage from the BEC at the same time, as this may drop as the BEC approaches the max current output. You never know it might make for some interesting results!
I hate to be "that guy", I really do BUT...there is a *fundamental flaw* here that means you can take these numbers and toss them in the trash! You are measuring only *1* side of the equation therefore missing how much total *power* these ESC's can put out. It's what causes people to get brownouts when a servo stalls. Amperage may shoot up to 5 amps, but voltage may dip to 3 volts. Generally in these type of circuits, amperage goes *UP* as voltage goes *DOWN* . One cancels out the other. You need to measure both input *voltage and amperage* and calculate total *wattage*. Watts = voltage x amperage. Watts is total power output.
So that ESC putting out 4 amp could be at 6 volts and put out 24 watts. (6x4=24) While the 5 amp ESC drops to 4 volts and only puts out 20 watts (5x4=20) and actually has LESS output!
Edited for "bold" formatting.
I love the crumpled element body on the shelf behind you RC Review!!
That thing was dead to me. 5 cracks and rips. But I pulled it out and it's back in mint shape!
@@RCReviewChannel
LoL..mine is beat to schit too..I have the element utility bed and it is actually decent.
This was really illuminating. Thanks! 👍
im so glad you know crawlers so well
You are fully of surprise!
Really nice and informative video!
Thanks again Carmine!
Keep up the good work!
🙂👌👍👍👍👍👍👍
We gather the tech info so you don't have to!
I’ve been around awhile and I’ve said it before, the realist and the rawest. If the RC companies cages were rattled before you’ve got them damn well shaking in their boots now!, lol. Well done. Thank you.
Wow that was a great tech video!!! Thanks for you hard work
Thanks for all the research with servos and everything. It really helps to know what you're getting for your money. Not a big deal but I just looked up *traxxas 2269 bec but the part number is actually 2262. Great content keep it up guys.
Right on. Good discoveries.
Thank you!!!! I REALLY enjoy your channel and information you give!
I just wanted to say I thought you did an awesome job on the presentation. It was exactly what I was looking to see.
I appreciate that!
👍Nice tests, I been fine running stock esc's with a home made glitch buster.
Thank you for explaining servos and amp rage
This is the sort I've testing I love! Nice to know that the 1080 internal BEC can do a pretty good job out of the box. In the test for the Power HD LW-20MG you did, it drew 4.3a so I'm happy my 1080 can cope. If someone is installing a more power hungry servo, why not spend a few more $$ and get an external BEC anyway :)
Right on. Glad to help.
Great info - thank you!
Your tech videos like these are awesome!!!
Glad you like them!
I absolutely love your videos you always give great information that's accurate please keep them coming I would love to go crawling with you one day LOL
Okay now you are putting in some work 😁! Creative knowledge 😉
Now that was a cool test, I always wondered what the BEC on my 1080 could handle
There we go!
Amps shown in test do not mean that your BEC circuit can handle those amps as you do not know how much safety margin manufacturer gives at rated amps. 1080 result would make me very nervous for this servo as it is set to 7,4V according to video description but can only put out 4,5A that is close to 4,4 at AE-5 set to 6V. So massive voltage drop for 1080 and AE-5 is rated to 3A so that is overloaded in this test as well. Measured amps drawn from the BEC do not give any indication about how much it can handle.
Have you considered doing a new version of this or your servo tests?I find these kind of tests really informative sorting the bs from the real data. Thanks!
Thank you for guys like you to help US save money, or build it right the first time! One thing I'd like to see you monitoring the voltage output when your doing the amp test on the BEC's along with the amp drawl. That way we can see the voltage sag as well when the BEC is getting pushed to its amperage limits. Course I'm probably one of the few people that would ask that..... after all what we experience in the form of "brownouts" or "glitches" from the voltage inconsistencies because of high loads. Course if you check out the video of my charging station on my channel, you'll see I'm a bit of a electrical nerd, who likes data. Considering I do alot of industrial electrical and robotics troubeshooting/repairs I'm very into that kinda stuff.. just not the serious math 😂🤣
Very cool video. keep up the good work.
Nice test, but you should also messure the voltage drop from the BEC.
Nice thank you. Very informative.
Thank you, that's helpful information
I usually do some turning while moving forward, and see how much the throttle "drops off" when I'm activating the servo from left to right. The Axe system I currently have keeps up pretty good . I do have a bec on standby(Hey Ok brand) in case I want to use it to keep the temps down on the esc , it's only rated for 5 amps and I've had it turned up to 12v when adjusting it. The version 2 Axe system claims to be able to make 6.0 amps @ 7.4v to the servo, which is one amp more than the original or version 1.
Boo yah! Stock market continues to go down; but, FC consistently raises his "stock" with servo and ESC BEC testing. Great job man!!!
Great video, I think I am one step closer to getting a Castle ESC. And a Holmes Hobby motor.
You should!
Best information yet! Thank you for clearing up the mystery. Have you tested a Castle Mamba X or any Holmes Hobbies esc's?
Great video, very informative 👍
It's cool since it's hasn't been done as far as we know.
Thanks. So what's the combo you recommend? Esc, bec and servo. Thanks for you time for answer
Wow I think the shocker was the hobby wing 1080 and the axial , those are so cheap but pot out great amps for the price. 👍👍
Maraming salamat, sir.
One other consideration for BEC and amp draw be it an external one or the internal one of an ESC is the combination of all electronics being powered by the BEC. I had a combination of one servo that was a little too power hungry with only a receiver being powered by the ESC in a touring car that had problems on these lines. The built in BEC of the ESC wasn't up to the task of providing power to the servo as well as the receiver. What would happen is the servo would cause the BEC to brown out (voltage would drop too much to try and keep up with amp draw) which would cause the receiver to glitch out from lack of power. I could negate the problem somewhat with a capacitor, but even then I would run into brown out situations (the combination was a Savox servo, Spektum receiver, an a Speed Passion receiver on 50C 4000mah 2S LiPo). I ended up replacing the servo with a different brand that had similar specs but lower current draw to fix the problem.
Fantastic videos. Great info we all eagerly want to know. I have a question about the hobbywing 1080 crawler esc. It rated at 4.5 amps with your test. Was the esc programmed for the BEC to be at 6v or 7.4v in your test? Thanks again for taking the time to make such great content.
Really valuable and technical !
In my experience I think that also receiver can influence the amperage throughput.
In fact in some cases changing receiver I've seen different performance with the same ESC & Servo.
Do you have some information about this ?
Awesome I watch all these been great test
Live and learn we say.
very interesting, i have a new bronco and you were right
after a few charge ups the servo is starting to die :(
so the stock ESC is generating 3.5 amp
is that good enough for the upgraded servo from traxxas ?
I assume that you left the Castle BEC at the default voltage (6v). It would be interesting to use the Castlelink to set the voltage to 7.4v and see how many amps it can provide!
Swampers RC was wondering about that myself
Great stuff always! I would like to know how many Amps will the Traxxas 2255 draws, it will be good if you can test it out.
I was using the traxxas blue coreless servo and found while the esc handled it, it got HOT. After moving to a castle bec for servo power I noticed much lower temps.
aa might be a 2year old vid but been watching your youtube for a long time was a main for nitro's but ever since X-maxx's came out they just seem the best all rounder for me since i was one for worrying about the ESC's or lipo batteries catching a light 🔥but i think we all can agree on they gotten way better then they used to be ;p
Quick question; I have the Hobbywing 1080 esc for my TRX-4 which I have the Savox 1230 servo and the stock receiver, do I need or should have an external BEC also and thanks all the informative videos you put out, awesome job guys!
Very informative
Running a motor as well at the same time would draw down the power on the servo?
Man this channel is so awesome. Thank you for all your efforts. This stuff is so helpful.
But i think you would have to use a much higher amp user( sorry, english is not my first language) because if that servo only pulls around 5 amp, none of this Devices will Show if it can put out more. That castle bec for axample claims up to 10 amp Max output. And if a 1 amp rated Esc gives almost 5,what would for example the axe Esc be caoable of?
You'd have to find a servo that drew that kind of current. He's already used the Savox 2290 which is the most power hungry servo they've tested and it only takes 5a
Was surprise by the result of axial stock esc almost the same result with the hobbywing 1080. Did you use the default output voltage of hobbywing1080(@6v) when you measure the current draws by the servo?
Would the settings on the radio make any difference, like end point and duel rate to the load on the servo.
One of your best videos of real world testing Except for the longevity test and brown out.
Now with the scx6 out could you do this with some 1/5 servos and compare to the stock one?
So i just got a Amazon 35k steering servo. I have a 2021 Traxxas bronco pretty much stock . I replaced the servo because the stock one was very weak. I didn't replace the BEC and now I'm wondering if I should. Thanks in advance for.the help
Thanks for sharing this. I've already watched your video when it aired. I might have a misconception in relation to servo amp draw and built in BECs... Will an amp hungry servo burn an integrated BEC? Or will the BEC just provide as much current as its limit allows (which is a built in safety feature)? This way the current will stay in a safe range? Or is the current the lesser problem while the generated heat is the dangerous issue? This is the main question.
Example is my setup: Mamba Monster X 6s, integrated BEC has 8 A peak, voltage can be adjusted. My servo is a brushless one rated at max. 555 oz or 40 kg at 8.4 V. Planning to run it at 5.5 or 6 V on the integrated BEC. Torque would be around 31 kg at 6 V. Still crazy fast on 6 V. Will it burn out the integrated BEC? Does this combination NEED an external BEC? I ran this combination previously on an external BEC, which can put out 8.4 V at 8 A. It powered the servo directly, bypassing the receiver. I'm running this in an 8th scale truggy, not in a crawler.
thx for sharing, 👍🏾
Informative video. But, what's up with the grey body over your left shoulder?
the one advantage I found with a external BEC is heat!!!
ESC’s with built-in BECs are Linear type and Linear BEC reduces the voltage from the main Lipo to 5V by converting the excess voltage into heat. This is not a very efficient way of voltage converting
yep its a no brainer to get a external bec.. cheap and way more powerful.. and even more efficient if getting a bec bypass adapter
I'm trying to find my way in this new world after a long break from RC cars since racing 12th scale road cars back in the mid 1980s. It looks like the kind of car I used to race is called a pan car now. I've bought a couple electric cars and just added an HSP 1/10 nitro rally car to my stable most recently. I've upgraded to an FS-GT5 TX/FS-BS6 RX combo and am working on installing a Dsservo DS3225SG to replace the stock steering servo, and decided to watch a few videos to demystify everything a bit, which led me here. My HSP 94177, being a nitro car, doesn't have an ESC and everything is now wired into the FS-BS6 receiver, but now I'm wondering if I should be using a BEC, or if a BEC is more important with electric motored cars where the motor might cause the voltage to sag low enough to keep the servo from working as it should?
The other thing puzzling me at the moment is whether I have to remove a bunch of screws and remove the battery/receiver box to get the servo wire through the little hole at the bottom, or if I'm overlooking an easier way to get around the gap between the chassis plate and radio box being too tight to finagle the servo connector through the hole. I'm a little apprehensive about removing a lot of screws at once since I don't yet know what might unexpectedly fall apart into multiple pieces and become a pain to figure out how to reassemble. 😉 Then again, I guess that's how you learn and become more comfortable with the whole car, so I'll convince myself to "send it" momentarily. 😉😁👍
What volts were all the different ESC/BEC running at? I might of missed thar on the video... It would be nice to know the proper Amp draw by Voltage
Hi, I enjoy your channel very much. Woul dyou please advise on one topic? I am getting Futaba HPS-A700 servo for my Traxxas Trx4. I want to pair it with the Hobbywing Combo-XERUN-AXE540-2300KV-FOC-V1.1. Would you be able to advise if there will be external BEC required?
HW 1080 just got better. Love it!
The little king!
I'm new to all this stuff and what servo would you recommend for the traxxas esc that can put out 3.5 amps. I have the TRX4 and want to run wider monster truck tires but I don't want to get too crazy in changing parts out. Thanks
Wow great tests! Just bought a reefs 444 and running on the stock xl-5hv and was wondering if it was a waste of money considering the esc couldn’t put out more than 1 amp so would not be seeing any torque gain. Good to see the stock esc puts out 3.5. Wondering if the 1080 is the best upgrade to get an extra amp and perhaps better crawling speed modulation
1080 is the best. So many configuration options and can bump up the power for that servo as well.
Any chance you can run this test again using some of the more popular esc's? Specifically interested in the the Copperhead 10 using a direct power servo such as the 3Bros G11 or G14
So if I have a rather small servo but an upgraded esc and motor would I need a BEC or would the rampage be fine. I'm confused as to whether a BEC is for when it requires more or less amps
Awesome 😎👍
Amazing that the relatively small servo wires can handle so many amps
Can you list out the perfect match setup for a beginner like me..from the r/c,battery,transmitter,esc,motor and servo..i want to restore my old karbon batt toys but i'm confused with load of each item i need too.. I'm considering using lipo batt..just a simple and cheap setup ..i really apprecited it..thank you
Please listen to my question!!
I have a power hd lw25.
I have a hobbywing 1080.
If i set my bec to 7.4 volts do i still have to install a bec for the servo?
It would help me if you refer to voltage output of each ESC along with AMPS produced.
Will do that. We have the wiring and meter for that now. Will show torque output too.
Does running a BEC increase the durability of a servo, or just increase performance in the case of servo with duel input voltages?
Nice work as usual! Question.. When installing a HW 1080 ESC (for brushed) on my TRX4 Sport, do I plug it in to the same port on my 2260 BEC where the stock ESC is plugged in now? Don't want to burn anything up. Thank you!
Yes you do
this one got you a few subscribers I bet!
could we see this test with the castle bec 2.0wp, rx4, and mamba x set at 7.4v.
test the castle xlx, and the hobbywing max 5 please
My project has 11 servos now, though 4 of them are not powered by the receiver, (powered by separate bec to via superscale 2020 unit) I am using a dumborc x6dcg receiver (with led outputs) and hobbywing 1080. I have added lights now but they don't work as expected and flicker a bit. I think I might need to add a bec, does anyone know how many amps I can draw throuh the recevier board before it gets too much?
You should make a jig that will hold the tires that way your getting the real amp draw with the use of a motor as well. Nice work tho. Should set up the castle bec to a base 6.0v lock the wheels turn the wheels to one side full lock and see what the system is drawing.
Holds a tire? That would introduce so much more inconsistencies. All we really need to do is run the motor to see if it affects AMP output of the ESC.
@RC Review do i need an external bec for my servo even if i use an mamba x esc
OK, so my WP1080 is as good as my Castle 10A. Neither would seem to be enough for four wheel steering when most affordable servos you recently tested pulled at least 3.5A. Assuming I'm running a pair of 3.5A servos off a 4.5A (tested output) BEC, what will happen? Will the servos just be weak, or am I risking frying something? Should I have a 15A or 20A (rated output) BEC for two 3.5A servos?
Notice how the servo does not "pull" and make noise during the XL5 test. Must see the voltage at that time. Makes sense that although is shows around 3.5 amps, it is really does not pull much. On the Castle Micro X the 3.9 amps make the servo scream!
I have the fs-gt3b also I like it a lot
That's a great transmitter.
Love the response of it moves my 1/16 wpl c24 around great
Hi, I have a TRX-4 and I want to upgrade my servo to traxxas-2255. My question is, do I really need a BEC for this servo. From your test here it is clear the ESC can afford over 3 amps. Kindly suggest.
Please excuse the ignorance, but If these esc's only put out 3 4 and 5 amps do you need a servo that calls for larger amps? Would I ever get the speed out of the servo specs listed below if my esc only puts out 3.5 amps?
Operating voltage: 4.8 - 6.8V
Operating speed ( 5.0V ): 0.15 sec/60 degree
Operating speed ( 6.8V ): 0.13 sec/60 degree
Stall torque ( 5.0V ): 21kg/cm
Stall torque ( 6.8V ): 25kg/cm
If the above servo calls for an operating range of 4.8 to 6.8 volts how does my traxxas 3 .5 volt esc work with it?
I purchased the popular 20kg amazon servos for my erevo 2.0 traxxas . Now i hooked them up now it won't turn while throttle on. Steering turns when stopped and when going in reverse it will turn under throttle .
Do i need a BEC ?
Traxxas thinks it is a receiver issue
Are those frequent type of symptoms ? Thank you
What is the output on a velineon vxl-8s?
Dang..I wish the torque output versus the amps was visible. I'm really interested to see the actual real world difference in torque..between a mamba x and a hw1080 .. You didn't happen to log those numbers, did you?
So could i use a 25kg servo with a traxxas 2260 bec?
What voltage are you using at Castle BEC? it comes from factory with 5,1v adjust. did you increase it ? and at HW1080 did you run the test at 6.0 or 7,4v?
Castle is at 6v. Hobbywing 1080 is at 7.4v. Great question!
Cool tests! Showing the amp draw is on the esc's bec outputs is only half the story. Be good to know what the voltage is dropping to. Receiver browning out and/or shutting off from low voltage isn't good for one thing.
What abot the Hobbywing wp 1060?
How did the mamba X out-performed the Power Supply amperage draw? Isn´t that the Control number??
We credit that to the vortex. The Mamba X is using big voltage I believe. 7.4 volts.
I really confused, can anyone help me? I have Pixhawk 4 with PM07, ESC without BEC I don't have servo motor. Should I need an external BEC? If I don't use what would happen? Thank you
Question, why didnt you show the difference in the hobbywings 1080 internal bec settings? Or better yet what was it set on when you tested it?
It was set at 7.4v
We need a hobbywing 1080 G2 update on amps..