Confusion. What do you mean by "bigger" battery? Do you mean a higher amperage rating? Do you mean more voltage? Both could be bigger, one would make a difference and the other would not. If you use a battery with "bigger" voltage, you WILL get more power. This is what "they" mean.
In this video, "Bigger" was meaning the C rating, or Amperage rating. Back in 2011 when this video was made, everyone was saying "go with a 'bigger' (more amperage) battery and you will have more power". But, this was back in 2011 and I need to remake this video to be more clear. I made this video to get the point across that a higher C rating will not get you more power, and if it does, it was not a large enough C rating to begin with. James, I appreciate your comment
Tony, you are trying to explain how to match these components but then you say "bigger battery". You also say that folks are wrong when they say you get more power when you use a "bigger" battery. You need to define "bigger". Most of the time the average modeler means higher cell count (4S vs 3S) when they say bigger. You WILL get more power if you use a 4S battery than a 3S battery. The 4S battery has a higher voltage which result is more power. So, don't use ambiguous terms like "bigger" say exactly what you mean (higher voltage bigger or physical size bigger or higher mah bigger).
@@RcHelpDotCom Ummm a higher C rated battery will give you more power, especially if you use a higher esc.. Example.. you motor pulls 55 amps, but you could put a bigger prop on that allows you to pull more amps, but because your batter can only say put out 65 amps, it will put out more up to the burst and then get hot expand and then fail. but.. if you put say a batter that puts out 65C now that same motor will pull the bigger amp draw, but at what expense? maybe more heat in the motor, maybe more heat in the ESC.. basically your video is very good at setting correct esc,batter, and motor specs, but it doesn't protect against bigger draws.. The fact that brushless motors will pull more amps... power based on the battery and ESC, and load but at the cost of motor damage or even burning it up!!.. We in the RC Boating have this problem all the time to go faster.
@@ericdiannestrickland7511 The C of the battery itself doesn't provide any additional power. What produces power is the load on the motor. BUT, if the load is draining more current than your current battery can provide, probably the battery is getting way hot. Switching it with a higer C battery now you can deliver the current your motor is asking for, and thus getting the "additional" power... Remember, is not the C of the battery that is providing any power. Take a setup which drains 10A. Assuming your battery can easily provide 30A with 20C for instance, switch the battery with a 60C one.. power will be the same.
Still informing (after all these years), those like me that didn’t understand this side of the hobby 👍👍 I had to watch it a couple of times and then do the math on my own choices when a light went on!! Thank you for this great video and explanation.
Thanks a million man. I am pretty new to this sport/hobby and I started out clueless. Before I spent more money only to crash and burn I invested in a very good sim which I spent an hour a day at least just learning to fly for my first two years and it did help me tremendously but there is nothing like the actual thing. i hear what you're saying about being careful as to what some guys say on the net. you and a few others have taught me more common sense things like all of the major pieces you gotta take into consideration when shopping around. Believe me I felt like a moron for far too many years and have mismatched components and allof the knuckle head things one does without asking questions and doing the research because there is a lot going on under the cowl. thanks I really enjoyed your presentation and even took notes which I will keep and use..take care, Chris
Thank you very much for this instruction video. I recently bought a glider but I am using a different battery than what the box instructed me to use and got mixed info regarding how I am to work out if my battery would work with this motor, using your instructions I was able to work out that my battery was more than enough for the motor and that the ESC can handle the battery perfectly fine.
Just remember, the motor is what pulls the power, the ESC regulates that power and the battery just supplies the power. As long as the ESC and battery are large enough (high enough amps) to handle the motor, you should be golden! www.Rc-Help.com
Brushless motors are given a Kv rating, which is RPM per volt, that lets you determine how fast that motor will rotate with a given voltage supplied to it. A 980Kv motor powered by an 11.1V battery would spin at 980 x 11.1 = 10878 RPM with no load. The current rating specifies the maximum continuous and/or burst current that the motor is able to handle. When selecting a battery and speed control, choose ones with continuous current ratings equal to or greater that that of the motor.
Thanks for the great video. I have a new electric glider and the ESC runs very warm which forces me to keep the flights short. Knowing something is not matching up right your video will allow me to calculate my ratings. Thanks again.
I have a 960 kv motor, not sure of the amp draw. 2200 lipo....and the 30A ESC gets hot and softens the wires to the point it quit operating. Motor just rattles back and forth on throttle now. ESC is shot....so I'm installing a 40A. According to your suggestions I feel I'm heading in the right direction.
What if i have an airframe weight avrage 1.44kg with 2200mah ESC, what motor i have to use for this RC-plane? I've try twice with 2212-1000kv but always fail.
3.117 lbs you need a motor that can generate 556 watts about 175 watts per pound then you to find out how much room in the battery compartment for your battery how many series cells can fit that will supply enough watts amps volts after that go to a motor web site like, Tom cat and then start checking the motor sizing chart from the chart it will help you decide which motor will work for you.
I had another question. The motor i want to use says the max voltage is 8.4v. does this mean if i give it more than 8.4 it will burn up? It just doesnt seem like that much power.
Hello i need help? Im looking at a motor that has a max watt of 315W, but i divided that by the battery I'm looking at volts which is 7.4V but got 42A and says the motors max current is 25A. What do i do?
Does the Esc amperage need to be bigger or lower than the batterys amps. ? If i have an instalation that require 60A , 60/4 =15A about an 20A Esc will work but the battery amperage need to be bigger or lower than 20A Required per motor ? The battery will need 60000mAh or the mAh multiplyed by C rate need to be 60A?
What if you already have a motor and want to put it in a new model, but the motor only states size and KV? Some model companies give the kv to match, but what if the kv is good but the size doesnt match smaller/bigger? Some others give GP/EP options, how do i tell if my EP motor matches the GP size? How do I work out the Watts or Amp of my motor with only KV on it? Ive got two motors I wanna use in new models, a 3226 - 970kv, and a 4250 - 910kv
Good video, covering the motor and prop selection. However, I wish you would have provided references how you came up with these formulas for prop diameter, pitch and rpm. You also didn't indicate the stall and pitch speed (or advance ratio) for a successful flight. Did you, for example, compare your findings with ECalc to see if there are discrepancies?
I know It’s a dumb question, but how do you know how many amps the battery can handle? I’m looking on Amazon for batteries in and of them say it. Please help. Thanks
I got great knowledge confidence and a ability to inquire about any type of plane bc I now understand the basics. thank you very much for setting the process of understanding the electronics straight. .
Still prob the best and one of only things I can find on what you would think is one of the most common questions! So really on any engine, you can run any voltage battery as long as the Amperage is enough? Is it that simple
Hy, does the ESC Amperage need to be bigger that the motor amp with 20% more, the battery also need to have a bigger value but the ESC how it need to be in comparation with the battery Amperage ? i saw that you have a 60 A esc with 50 A battery, if you put a bigger Amperage battery value , will burn the ESC ?
I do not know, as you have not provided any voltage, wattage and/or amperage ratings for the motor. The current capacity of the battery and ESC MUST be higher than the motor can pull. www.Rc-Help.com
@@tonyjaikaran6085 If it was for my plane or whatever model, I would be looking at a 150a ESC, and a battery that can handle about 175a just to play it safe. www.Rc-Help.com
KV is RPM Per Volt. Take that KV number and multiply it by the voltage of your battery. And wattages are 'usually' on the spec sheet. If they are not, then you will need to use a watt meter to find out what the number is. www.Rc-Help.com
I suggest this one, the stock replacement for that plane. www.parrot.com/us/spareparts/drones/parrot-disco-motor-screws?ref=448#parrot-disco-motor-screws-details
WOW ITS nice explanation .its hard to set up ,can i ask pls sir.i have 1200kv 3536 motor what battery i need to use for my plane,and rating?and more the 4s3p li ion battery would work for this.esc is 30 amps.
hey, i have a 2881kv motor for my boat. i divided it by 11.1 v which is my battery voltage and got 259.55. where did i go wrong because i am running a 120 A water-cooled esc and it seems fine, thanks
I know it's a different setup but random question. Just purchased a 3500 7.2 v larger battery for my RC car. It runs fine forward but nothing in reverse. Is it possible the esc can't handle the bigger battery? It was running a 2000 7.2v
MAH will have no affect on an ESC, nor will C rating. The S rating (voltage) is what affects an ESC and as long as that is the same (and according to your post, it is), then everything should be good. I would recalibrate your ESC and see if that fixes the no reverse issue.
@@RcHelpDotCom thanks for he reply. Yeah I have reset and calibrated the esc several different ways but everytime it won't work in reverse. It lights up to say it's working but nothing. Might need a new esc I'm guessing
There are some ESC's that have a reverse lockout feature for when you want to race (since reverse is banned in racing). Might be something to look into. If that is still not it, come over to the forum and post your question there. We have many fantastic members over there that can help out with just about anything. www.Rc-Help.com
Great Video ... I am confused over one thing. you mention how to determine the AMP rating of the motor by dividing the watts by the number of volts (700/14.4) 47 amps. If I use the same scenario and use a 3s battery (700/11.1) 63 amps. Does this mean that I need a larger ESC with a smaller battery? 3s versus a 4s battery? I must be missing something ...
Your better off going with a 4s pack because 63 amps will reduce your fight time. Yes a small 3s pack only supplies 11.1 volts on 700watt motor need more amps to spin it do to the lower volts. its all a balance for a motor to produce 700 watts.
hi, i am running a turnigy areodrive 4250 350kv rating motor with a 60amp turnigy plush esc, the motor draws 55amps, this is for a wheeled project, i am wanting to run it on 2 7.4v lipo, i found one 2s 40-60c 10000mah turnigy nano, trying to think if it will be suitable use. i am thinking of connecting them to make a 14.8v, but i am not sure about the c rating. will the c rating double, (so 80-120c) will it brake my motor or esc.
The Eflite power 46 with a 4 cell calls for 62.5 amps..now i cant go with the 60 amp esc right? if i use a 5 cell it pulls 50 amps. If i get the 80 amp esc can everything still run smoothly or is it to much?
what about the voltage of the battery and voltage of the motor? Can I get a higher voltage than that necessary for my motor? For example, I see this motor rated as 2-3S but im considering a 4S battery. I'm new to the hobby and trying to get my head wrapped around the selection process. Thank you.
This may be a dumb question, but here goes... Does the amp rating listed on a motor indicate the max amps that the motor should be drawing? Or is it just approximately what the manufacturer thinks you'll get? ie: I have a 670kv motor rated at 40amps on a 4s (14.8V) battery which gives me 45.27 Amps. Am I overworking the motor? ( a 5 cell would bring it right down to 39amps, but I already bought two 4 cells)
Doesn't matter. The battery does not 'push' the power, the motor 'pulls' the power. All the battery is there for is a storage device for power. You can use as large of a C rating as you want or can afford. Just make sure the S rating is correct. www.Rc-Help.com
hi rchelp.com i have a motor rated 2200KV at MAX 342W which is pulling 30.81amp and i have battery rated 30C 1800mah, I need to match this motor to an ESC, how many A ESC should be best for my motor? previously i have an ESC at rate 30A but I burned out two of them so far, interesting while the ESC is burning the motor is seem not really hot at all. is this the case that i need a higher ESC A?
Thanks for that info. I calculated my set up on my truck, my 800w 2200kv motor with a 80a esc are a good match. My question is, is it ok to use lipos going way over it's capacity? I want to run 2 5000Mah 40c 2s I know it equals to 400 amps. Is that ok?
Thank you for the video. It falls down badly for me when it says 'the motor is 700 watts' - how do you know that? It all makes sense with that knowledge, but not knowing makes it impossible to proceed. Also, I have to set up a power train from scratch, and have no 'manufacturers recommendations', so again, impossible to proceed. Thanks, anyway.
Hi, I have been looking at some brushless motors online, but I am having trouble finding their watt or amp rating. The only info they gave was the KV and N.O. of cells.Without the amp rating, I can't choose an ESC... Please help D: thank you!!
Based on those calculations my motor would want 63 amps but the esc i was looking to get is just 60. Is that close enough or do you think things will get hot? Its for a boat and the esc is water cooled.
If you can find a wattage number you can do some math to find out the amp rating at a given voltage. Watt / Volt = Amp. If you can't find a wattage rating, then it is likely that you won't be able to find a safe voltage rating in which case, I wouldn't run the motor. www.Rc-Help.com
So you say going from a 3s to a 4s or (up in battery voltage) wont increase power . But say your motors max draw was 50 amps . 50x11.1 (3s lipo) = 555(watts) . Now if we up the voltage to 14.8v (4s lipo) . so 50(amps) x 14.8(4s lipo) = 740(watts) . Which is more power if im not mistaking .
3-4s is not what I was saying in this video. I'm saying going up in C rating (C, not S), if you see an increase in power, then your old battery did not have a high enough C rating and was causing a bottleneck. www.Rc-Help.com
Increasing series is better for making more power with less amp draw your motors will last longer but never exceed the manufacturers recommendation for the number of cell in series.
I want to buy a e flite 60 motor for an 46 bonanza. I can't seem to find the right ESC any help on what brand is best or which one to get?? I'm switching from Glow to Electric. So excited!!!
E-Flite is suggesting an 80a ESC to put with this motor. I cannot find any specs on the E-Flite 60 motor for max amp draw, so I would go by their recommendations. I use HobbyWing ESC's (pictured in this video) and the have worked flawlessly for me over the years.
@@RcHelpDotCom what engine do you recommend for me? With the EsC plz, if it's not to much to ask.. I was seen some malfunction on the Eflite 60 with their ESC they recommend....,😔
Come over to the forum and post up with your question, and be sure to mention what you have posted over here. We have a lot of great people on the forum that can provide many more options than what I can alone. www.Rc-Help.com
hello good day, can i ask some question? I have been performing this combination, was this combination is correct for:? 120brushless esc 4068 1900kv 2200W brushless motor 100C 22.2 V Lipo Battery I just did your computation and it conclude that my setup was 22.2v/2200W= less than a 90Amp? Thank you have a great day God Bless
For the motor, 2200 watts with a 22.2 nominal voltage will be 99.099 amps. Basically 100 amps. 2200/22.2=99.099 If you have a 100a ESC, you should be fine. You didn't say what your MAH of the battery pack is, however if it's over 1000mah, again, you should be fine. www.Rc-Help.com
@@RcHelpDotCom Thanks Bro really appreciated it. I didn't have the battery yet, but I'm planning to have 22.2v with 4200mAh and 120a ESC.. with your guide many people especially fellow RC hobbyist can achieve their own milestone without hesitating because of your videos
Yes, and no. There is no such thing as too big for the Rx, but there is such a thing as too much voltage going into your Rx. However, most of the BEC's in an ESC are topping out at 8.4 volts or so, so most receivers can handle that. It's the servos you need to worry about. www.Rc-Help.com
Hi, I just got a CR28M KV: 1050. That is 2 contrarotating motors, rated by the manufacturer at 320W or 25A each. Do I need two separate ESCs, rated at 25A each? And a battery that can push 50A? What battery do you recommend? This is my first build and I'm quite overwhelmed. Any help would be greatly appreciated.
@@RcHelpDotCom Because it is also said that when you apply higher or lower voltage than specified then you might damage your device. That's why I asked. So how come it does not apply here? By the way thank you so much for the quick reply.
Maybe you can help me, fryed my motors (all 4 on quad) by upgarding to 2x 4s 35c 1800 lipo. Esc are 25 amp, motors WHERE 1460kv thunder tigers. What motors should I use that wont die with this set up? thx in advance
You can't figure out the watts with the KV. KV on these brushless motors means RPM Per Volt. So if you have a 1000kv motor, 1 volt will equal 1000 RPM, 2 volts, 2000 rpm and so on. The best way to figure out wattage is with a watt meter which are pretty inexpensive now, but the motor manufacturer should give some numbers to start with. This is where I would start. Hope this helps. www.Rc-Help.com
Great video. I have looked all over for something that explains it all so clearly. The only thing I am still unclear on is how does a prop fit into all of this? Once you figure out that you have the right setup, how do you figure out what prop to run?
If the manufacturer has not provided a max wattage or max amperage, then you will need an Amp Meter, or ammeter, whichever way you want to spell it. Put the suggested prop on it (or whatever load your situation requires) and run it at full load with a full battery. Remember, Ohms law, the higher the volts, the lower the amps, the lower the volts, the higher the amps. www.Rc-Help.com
@@RcHelpDotCom My setup: motor 650 watts, esc 45, battery 3200 maH, 20c. from your formulas, now I'm concerned about smoking the 45 ESC? It was in an ARF, (except battery, which I bought).
Thanks for your quick reply. let's take Turnigy 710kv as an example. the spces( Battery: 3~5 Cell /11.1~18.5V RPM: 790kv Max current: 40A No load current: 1.8A Max power: 715W) According to your equation, if I will use 3 cells battery.. to calculate ESC: 715/11.1 = 64 Amp .. which is not correct .. the max input current is 40amp. my point, power value is changed according to voltage (# of cells).. I hope that I was able to deliver my point .. btw, I like your channel :) :)
Currently looking for an esc to go with my motor. The motor is 1770 watts and my batteries are 11.1V 30c 3 cell. This means it's drawing 159 amps? So I need minimum 180Amp esc. But then I do the battery maths and work out that my batteries can only put out 66amps anyway? So I need new batteries as well now? Trouble is I can't seem to find a motor small enough using the maths you've provided. The stock motor in the rc would not have been appropriate in the first place? Please help ?
so i have a 1400 kv motor for my park flyer.... i run 3 cell lipo.... using your formula my little 80 graham motor is pulling 126 amps? is that correct?
Hi Tony, Is there a way to calculate the watt rating from the motor Kv rating and voltage? The E-Razor 450 has a 2750Kv motor so what would this equalte to in watts?
The motor I have is a Turnigy G46 (670 kv). It lists a 12x8 ~ 14x10 prop. That's pretty broad. Is there any rule of thumb as to what might be closest? I understand a lower kv may often require a larger prop. On a side note, I have a watt meter on order... so I'm glad to hear your recommendation regarding that.
Pay attention to amps rating because too many amps will spell disaster for your motor and esc, stay within the motor and esc ratings ,if your motor is rating 40amps the esc should be 50 amps pick a battery that can handle the highest motor rating . 2200 at 20c is 44 amps ,get it.
Hi, I'm new to building, and just picked up a new Himax outrunner motor, it is a HC3514-2900 800w. I think it is a funjet set up with a Phoenix Icelite 75am ESC I know it has a lot of power but I'm making a big airplane with 70in wings it will weighs about 4 to 5 pounds, is this a good motor for my set up?
I'm a little confused but because of I'm a noob, not for your video! if I understood, if I have a 500watt motor, with a 6s battery I need a 35 A esc, with a 3s battery I need a more powerful esc (70A) is that's right?
Yes ,you are right.Lipo are more reliable in power supply. But as just a confirmation I need.Li ion will work on my ESC. One more thing. Do it need any ESC programming change.
Confusion. What do you mean by "bigger" battery? Do you mean a higher amperage rating? Do you mean more voltage? Both could be bigger, one would make a difference and the other would not.
If you use a battery with "bigger" voltage, you WILL get more power. This is what "they" mean.
In this video, "Bigger" was meaning the C rating, or Amperage rating. Back in 2011 when this video was made, everyone was saying "go with a 'bigger' (more amperage) battery and you will have more power". But, this was back in 2011 and I need to remake this video to be more clear. I made this video to get the point across that a higher C rating will not get you more power, and if it does, it was not a large enough C rating to begin with. James, I appreciate your comment
Tony, you are trying to explain how to match these components but then you say "bigger battery". You also say that folks are wrong when they say you get more power when you use a "bigger" battery. You need to define "bigger". Most of the time the average modeler means higher cell count (4S vs 3S) when they say bigger. You WILL get more power if you use a 4S battery than a 3S battery. The 4S battery has a higher voltage which result is more power. So, don't use ambiguous terms like "bigger" say exactly what you mean (higher voltage bigger or physical size bigger or higher mah bigger).
@@RcHelpDotCom Ummm a higher C rated battery will give you more power, especially if you use a higher esc.. Example.. you motor pulls 55 amps, but you could put a bigger prop on that allows you to pull more amps, but because your batter can only say put out 65 amps, it will put out more up to the burst and then get hot expand and then fail. but.. if you put say a batter that puts out 65C now that same motor will pull the bigger amp draw, but at what expense? maybe more heat in the motor, maybe more heat in the ESC.. basically your video is very good at setting correct esc,batter, and motor specs, but it doesn't protect against bigger draws.. The fact that brushless motors will pull more amps... power based on the battery and ESC, and load but at the cost of motor damage or even burning it up!!.. We in the RC Boating have this problem all the time to go faster.
@@ericdiannestrickland7511 The C of the battery itself doesn't provide any additional power.
What produces power is the load on the motor.
BUT, if the load is draining more current than your current battery can provide, probably the battery is getting way hot. Switching it with a higer C battery now you can deliver the current your motor is asking for, and thus getting the "additional" power...
Remember, is not the C of the battery that is providing any power. Take a setup which drains 10A. Assuming your battery can easily provide 30A with 20C for instance, switch the battery with a 60C one.. power will be the same.
I'm a total rc novice and this helped me sooooooo much In understanding how to pick the right motor esc and battery! U rock bro!!!!!
Still informing (after all these years), those like me that didn’t understand this side of the hobby 👍👍 I had to watch it a couple of times and then do the math on my own choices when a light went on!! Thank you for this great video and explanation.
Thanks a million man. I am pretty new to this sport/hobby and I started out clueless. Before I spent more money only to crash and burn I invested in a very good sim which I spent an hour a day at least just learning to fly for my first two years and it did help me tremendously but there is nothing like the actual thing. i hear what you're saying about being careful as to what some guys say on the net. you and a few others have taught me more common sense things like all of the major pieces you gotta take into consideration when shopping around. Believe me I felt like a moron for far too many years and have mismatched components and allof the knuckle head things one does without asking questions and doing the research because there is a lot going on under the cowl. thanks I really enjoyed your presentation and even took notes which I will keep and use..take care,
Chris
I fly quadcopters but I find that your videos are very helpful in helping me understand the electronics
I'm glad we could help out. Thanks for commenting. www.Rc-Help.com
Thank you very much for this instruction video. I recently bought a glider but I am using a different battery than what the box instructed me to use and got mixed info regarding how I am to work out if my battery would work with this motor, using your instructions I was able to work out that my battery was more than enough for the motor and that the ESC can handle the battery perfectly fine.
Just remember, the motor is what pulls the power, the ESC regulates that power and the battery just supplies the power. As long as the ESC and battery are large enough (high enough amps) to handle the motor, you should be golden! www.Rc-Help.com
this was the best no BS advice explanation thanks rc-help
I've been looking for hours for this exact information. Thank you sir, you are a genius.
I’m working on r/c racing boat. Wonder if these calculations would apply
The helpful, non-subjective info is appreciated.
Brushless motors are given a Kv rating, which is RPM per volt, that lets you determine how fast that motor will rotate with a given voltage supplied to it. A 980Kv motor powered by an 11.1V battery would spin at 980 x 11.1 = 10878 RPM with no load. The current rating specifies the maximum continuous and/or burst current that the motor is able to handle. When selecting a battery and speed control, choose ones with continuous current ratings equal to or greater that that of the motor.
What does C mean if i want to calculate to ampers? Where can I find it on the product description?
Thanks for the great video. I have a new electric glider and the ESC runs very warm which forces me to keep the flights short. Knowing something is not matching up right your video will allow me to calculate my ratings. Thanks again.
That’s just so helpful for a novice like me. It makes total sense. Thanks so much
Nobody explained it better than you! Thanks!
You're welcome!
I have a 960 kv motor, not sure of the amp draw. 2200 lipo....and the 30A ESC gets hot and softens the wires to the point it quit operating. Motor just rattles back and forth on throttle now. ESC is shot....so I'm installing a 40A. According to your suggestions I feel I'm heading in the right direction.
This might sound dumb but if you get a bigger battery, bigger as in more mAh not C rate, you would get more flight time right?
What if i have an airframe weight avrage 1.44kg with 2200mah ESC, what motor i have to use for this RC-plane?
I've try twice with 2212-1000kv but always fail.
Good power rating is 150 to 200 watts per pound.
3.117 lbs you need a motor that can generate 556 watts about 175 watts per pound then you to find out how much room in the battery compartment for your battery how many series cells can fit that will supply enough watts amps volts after that go to a motor web site like, Tom cat and then start
checking the motor sizing chart from the chart it will help you decide which motor will work for you.
I had another question. The motor i want to use says the max voltage is 8.4v. does this mean if i give it more than 8.4 it will burn up? It just doesnt seem like that much power.
Hello i need help? Im looking at a motor that has a max watt of 315W, but i divided that by the battery I'm looking at volts which is 7.4V but got 42A and says the motors max current is 25A. What do i do?
do you know if this motor will fit the extreme flight 48" Vanquish? If so, what motor is it?
Oh man, where has this video been all my life, my robbe charter is sitting not finished due to the fact that I havent worked it out yet. Thanks
Glad I could help out Patrick!
Does the Esc amperage need to be bigger or lower than the batterys amps. ? If i have an instalation that require 60A , 60/4 =15A about an 20A Esc will work but the battery amperage need to be bigger or lower than 20A Required per motor ? The battery will need 60000mAh or the mAh multiplyed by C rate need to be 60A?
how do you figure watts on motor if it is a 1900kv brushless or is there other equation to use to figure amps motor is pulling
I'm build a 1800mm ov10 with rimfire and 80amp esc can I use 6s lipos instead of 4s the motors are rated up to 6s ?
I'm using two rimfire .46 outrunner brushless motor 800kv
What if you already have a motor and want to put it in a new model, but the motor only states size and KV? Some model companies give the kv to match, but what if the kv is good but the size doesnt match smaller/bigger? Some others give GP/EP options, how do i tell if my EP motor matches the GP size? How do I work out the Watts or Amp of my motor with only KV on it? Ive got two motors I wanna use in new models, a 3226 - 970kv, and a 4250 - 910kv
will you see a longer flight time with the larger batterie? What sort of flight time do you see from this setup?
I need some help here, i have bought a 8A esc, and my motor is 2A to 6A, will it still work? Please help me.
if i am building my own rc plane then how to know how much power is required i.e. how big motor to use?
Good video, covering the motor and prop selection. However, I wish you would have provided references how you came up with these formulas for prop diameter, pitch and rpm. You also didn't indicate the stall and pitch speed (or advance ratio) for a successful flight. Did you, for example, compare your findings with ECalc to see if there are discrepancies?
I know It’s a dumb question, but how do you know how many amps the battery can handle? I’m looking on Amazon for batteries in and of them say it. Please help. Thanks
I got great knowledge confidence and a ability to inquire about any type of plane bc I now understand the basics. thank you very much for setting the process of understanding the electronics straight.
.
now this is something useful.
Still prob the best and one of only things I can find on what you would think is one of the most common questions!
So really on any engine, you can run any voltage battery as long as the Amperage is enough? Is it that simple
So if you had a 80 amp speed control would it not be a problem on that plane ?
Wouldn't be a problem at all. The 80a on an ESC is what it can handle. The motor is what is pulling the power.
Hy, does the ESC Amperage need to be bigger that the motor amp with 20% more, the battery also need to have a bigger value but the ESC how it need to be in comparation with the battery Amperage ? i saw that you have a 60 A esc with 50 A battery, if you put a bigger Amperage battery value , will burn the ESC ?
A TRULY great video because you explain everything and now i can find what i need for my airplane
THANKYOU!!!!!!
if i used brushless motor 11,1 V and ESC 20A how much batery capacity i can use??thanks for your help
looking for help with the matching of a rocket 600kv rc boat motor and esc ..what amp should we use and what battery size ??
I do not know, as you have not provided any voltage, wattage and/or amperage ratings for the motor. The current capacity of the battery and ESC MUST be higher than the motor can pull. www.Rc-Help.com
@@RcHelpDotCom thanks for the feedback here are the ratings : 600kv max amps 126a max voltage 50v max power 6300w no load current 1.8a
@@tonyjaikaran6085 If it was for my plane or whatever model, I would be looking at a 150a ESC, and a battery that can handle about 175a just to play it safe. www.Rc-Help.com
ok so Kv is constant velocity. NOT kilovolts (kV) got it. are wattages usually listed when you get a new motor?
KV is RPM Per Volt. Take that KV number and multiply it by the voltage of your battery. And wattages are 'usually' on the spec sheet. If they are not, then you will need to use a watt meter to find out what the number is. www.Rc-Help.com
which motor you recommend for replacement after the original disaster in parrot disco ?
I suggest this one, the stock replacement for that plane. www.parrot.com/us/spareparts/drones/parrot-disco-motor-screws?ref=448#parrot-disco-motor-screws-details
WOW ITS nice explanation .its hard to set up ,can i ask pls sir.i have 1200kv 3536 motor what battery i need to use for my plane,and rating?and more the 4s3p li ion battery would work for this.esc is 30 amps.
hey, i have a 2881kv motor for my boat. i divided it by 11.1 v which is my battery voltage and got 259.55. where did i go wrong because i am running a 120 A water-cooled esc and it seems fine, thanks
I know it's a different setup but random question. Just purchased a 3500 7.2 v larger battery for my RC car. It runs fine forward but nothing in reverse. Is it possible the esc can't handle the bigger battery? It was running a 2000 7.2v
MAH will have no affect on an ESC, nor will C rating. The S rating (voltage) is what affects an ESC and as long as that is the same (and according to your post, it is), then everything should be good. I would recalibrate your ESC and see if that fixes the no reverse issue.
@@RcHelpDotCom thanks for he reply. Yeah I have reset and calibrated the esc several different ways but everytime it won't work in reverse. It lights up to say it's working but nothing. Might need a new esc I'm guessing
There are some ESC's that have a reverse lockout feature for when you want to race (since reverse is banned in racing). Might be something to look into. If that is still not it, come over to the forum and post your question there. We have many fantastic members over there that can help out with just about anything. www.Rc-Help.com
I have a 110th Bigfoot I'm not good with math can you help me out with the size of the esc and battery size thanks 👍
Great Video ... I am confused over one thing. you mention how to determine the AMP rating of the motor by dividing the watts by the number of volts (700/14.4) 47 amps. If I use the same scenario and use a 3s battery (700/11.1) 63 amps.
Does this mean that I need a larger ESC with a smaller battery? 3s versus a 4s battery? I must be missing something ...
I'm right here with ya on this ? lolzzz
Your better off going with a 4s pack
because 63 amps will reduce your fight time.
Yes a small 3s pack only supplies 11.1 volts
on 700watt motor need more amps to spin it do to the lower volts. its all a balance for a motor to produce 700 watts.
hi, i am running a turnigy areodrive 4250 350kv rating motor with a 60amp turnigy plush esc, the motor draws 55amps, this is for a wheeled project, i am wanting to run it on 2 7.4v lipo, i found one 2s 40-60c 10000mah turnigy nano, trying to think if it will be suitable use. i am thinking of connecting them to make a 14.8v, but i am not sure about the c rating. will the c rating double, (so 80-120c) will it brake my motor or esc.
The Eflite power 46 with a 4 cell calls for 62.5 amps..now i cant go with the 60 amp esc right? if i use a 5 cell it pulls 50 amps. If i get the 80 amp esc can everything still run smoothly or is it to much?
I need help i have a esc power supply for recever are 5v 5a it not will born recever?
what about the voltage of the battery and voltage of the motor? Can I get a higher voltage than that necessary for my motor? For example, I see this motor rated as 2-3S but im considering a 4S battery. I'm new to the hobby and trying to get my head wrapped around the selection process. Thank you.
This just 😊 helped me with my rc drag racing build!!!
So im running a 190amp motor with a 150 amp esc 🤦♂️ makes alot of sense now why it keeps cutting out.
This may be a dumb question, but here goes... Does the amp rating listed on a motor indicate the max amps that the motor should be drawing? Or is it just approximately what the manufacturer thinks you'll get? ie: I have a 670kv motor rated at 40amps on a 4s (14.8V) battery which gives me 45.27 Amps. Am I overworking the motor? ( a 5 cell would bring it right down to 39amps, but I already bought two 4 cells)
what if the max amp supplied by the battery in more than the ESC rating?
Doesn't matter. The battery does not 'push' the power, the motor 'pulls' the power. All the battery is there for is a storage device for power. You can use as large of a C rating as you want or can afford. Just make sure the S rating is correct. www.Rc-Help.com
can I ask? Can A2212 2200kv brushless motor work with a 11.1V 2200mah 30c lipo battery?
the brushless motor is 30A
As long as it can handle a 3S battery, yes. www.Rc-Help.com
hi rchelp.com i have a motor rated 2200KV at MAX 342W which is pulling 30.81amp and i have battery rated 30C 1800mah, I need to match this motor to an ESC, how many A ESC should be best for my motor? previously i have an ESC at rate 30A but I burned out two of them so far, interesting while the ESC is burning the motor is seem not really hot at all. is this the case that i need a higher ESC A?
Is the higher the MAH the longer the batteries will last when using it at the given C rating?
Which esc best for 2212 2200kv brushless motor
I have no idea, see this video - th-cam.com/video/pA0SmWwXu2E/w-d-xo.html
Thanks for that info. I calculated my set up on my truck, my 800w 2200kv motor with a 80a esc are a good match. My question is, is it ok to use lipos going way over it's capacity? I want to run 2 5000Mah 40c 2s I know it equals to 400 amps. Is that ok?
Thank you for the video. It falls down badly for me when it says 'the motor is 700 watts' - how do you know that? It all makes sense with that knowledge, but not knowing makes it impossible to proceed. Also, I have to set up a power train from scratch, and have no 'manufacturers recommendations', so again, impossible to proceed. Thanks, anyway.
Hi, I have been looking at some brushless motors online, but I am having trouble finding their watt or amp rating. The only info they gave was the KV and N.O. of cells.Without the amp rating, I can't choose an ESC... Please help D: thank you!!
I am actually trying to build a camera gimbal, not sure if theres a difference between the gimbal motors and the brushless motors?
Now is this the same for rc cars or just aircraft
If I have a 10 amp speed controller with an input out 4.4-8.4 volts, would it be ok to run a 370 brushed motor on 7.4 2s lipo?
The lipo will be fine, but I have no idea what kind of power your motor is drawing so I don't know what ESC to match it up to. www.Rc-Help.com
Excellent video. I just figured out why my hexacopter battery is getting hot. I need a bigger battery. Thanks!
Based on those calculations my motor would want 63 amps but the esc i was looking to get is just 60. Is that close enough or do you think things will get hot? Its for a boat and the esc is water cooled.
What if the motor amp information is not available? How can i match my lipo and esc to the motor?
If you can find a wattage number you can do some math to find out the amp rating at a given voltage. Watt / Volt = Amp. If you can't find a wattage rating, then it is likely that you won't be able to find a safe voltage rating in which case, I wouldn't run the motor. www.Rc-Help.com
Thanks
Simple & clear explanation. Well done!
hi I need help i have a brushless motor d2830 1300kv which prop I can use??
with 3cell battery.
thanks for help.
How can i calculate my motor's watt rating ( dont have the specs) its a 7.4v , 2700kv motor ?
You need a watt meter, check out Hobbyking.
So you say going from a 3s to a 4s or (up in battery voltage) wont increase power .
But say your motors max draw was 50 amps . 50x11.1 (3s lipo) = 555(watts) . Now if we up the voltage to 14.8v (4s lipo) . so 50(amps) x 14.8(4s lipo) = 740(watts) . Which is more power if im not mistaking .
3-4s is not what I was saying in this video. I'm saying going up in C rating (C, not S), if you see an increase in power, then your old battery did not have a high enough C rating and was causing a bottleneck. www.Rc-Help.com
Increasing series is better for making more power with less amp draw your motors will last longer but never exceed the manufacturers recommendation for the number of cell in series.
I guess I will never understand this. I have a Bigfoot 160 on a 96" 16 lb cub. can you recommend an ESC and battery please.
I dont know what S rating either, I'm lost. would like to spend 100 for both if I could.
just a scale flyer
First video I've seen on this that made sense, thanks man!
Im using a 900w motor with a 7.2v battery. When you do the math you get 125. That seems like way too much. would i realy need a 125A ESC??
can i put a 1000mah 3s 20c battery with a peak discharge of 30c on a 20amp esc?
I want to buy a e flite 60 motor for an 46 bonanza. I can't seem to find the right ESC any help on what brand is best or which one to get?? I'm switching from Glow to Electric. So excited!!!
E-Flite is suggesting an 80a ESC to put with this motor. I cannot find any specs on the E-Flite 60 motor for max amp draw, so I would go by their recommendations. I use HobbyWing ESC's (pictured in this video) and the have worked flawlessly for me over the years.
@@RcHelpDotCom what engine do you recommend for me? With the EsC plz, if it's not to much to ask.. I was seen some malfunction on the Eflite 60 with their ESC they recommend....,😔
Come over to the forum and post up with your question, and be sure to mention what you have posted over here. We have a lot of great people on the forum that can provide many more options than what I can alone. www.Rc-Help.com
Hey, I am a hobbyist can you tell me how do you select the motor for rc aircraft? How much thrust to weight ratio do you choose ?
So I my motor, esc and lipo all match up then what do I need to get more flight time if my plane able to carry extra weight?
All you would have to do is increase the MAH of the battery for longer flight times. www.Rc-Help.com
hello good day, can i ask some question? I have been performing this combination, was this combination is correct for:?
120brushless esc
4068 1900kv 2200W brushless motor
100C 22.2 V Lipo Battery
I just did your computation and it conclude that my setup was
22.2v/2200W= less than a 90Amp?
Thank you have a great day God Bless
For the motor, 2200 watts with a 22.2 nominal voltage will be 99.099 amps. Basically 100 amps.
2200/22.2=99.099
If you have a 100a ESC, you should be fine.
You didn't say what your MAH of the battery pack is, however if it's over 1000mah, again, you should be fine.
www.Rc-Help.com
@@RcHelpDotCom Thanks Bro really appreciated it. I didn't have the battery yet, but I'm planning to have 22.2v with 4200mAh and 120a ESC.. with your guide many people especially fellow RC hobbyist can achieve their own milestone without hesitating because of your videos
Hi very handy video thanks ... So a esc never to high right ?
Can a esc be to big for a receiver?
Yes, and no. There is no such thing as too big for the Rx, but there is such a thing as too much voltage going into your Rx. However, most of the BEC's in an ESC are topping out at 8.4 volts or so, so most receivers can handle that. It's the servos you need to worry about. www.Rc-Help.com
Hi, I just got a CR28M KV: 1050. That is 2 contrarotating motors, rated by the manufacturer at 320W or 25A each. Do I need two separate ESCs, rated at 25A each? And a battery that can push 50A? What battery do you recommend? This is my first build and I'm quite overwhelmed. Any help would be greatly appreciated.
Good learning, thanks for this video
Awesome video. Helps me alot. I am new to the RC world.
You said you could use an 11.1 V battery as well. Isn't there a restricting voltage limit for the motor? Like it needs 14.8V battery or something?
It will depend on the motor and the battery. The lower the volts, the higher the amps given the same wattage.
@@RcHelpDotCom Because it is also said that when you apply higher or lower voltage than specified then you might damage your device. That's why I asked. So how come it does not apply here? By the way thank you so much for the quick reply.
Maybe you can help me, fryed my motors (all 4 on quad) by upgarding to 2x 4s 35c 1800 lipo. Esc are 25 amp, motors WHERE 1460kv thunder tigers. What motors should I use that wont die with this set up? thx in advance
To get the amp draw from the motor, you said you need the wattage. How do you figure out the watts of the motor from the kv number?
You can't figure out the watts with the KV. KV on these brushless motors means RPM Per Volt. So if you have a 1000kv motor, 1 volt will equal 1000 RPM, 2 volts, 2000 rpm and so on. The best way to figure out wattage is with a watt meter which are pretty inexpensive now, but the motor manufacturer should give some numbers to start with. This is where I would start. Hope this helps. www.Rc-Help.com
Great video. I have looked all over for something that explains it all so clearly. The only thing I am still unclear on is how does a prop fit into all of this? Once you figure out that you have the right setup, how do you figure out what prop to run?
Thank you, that is really helpful.
One question though. Is there a way of calculating the wattage of a motor when it is not given by the manufacturer?
If the manufacturer has not provided a max wattage or max amperage, then you will need an Amp Meter, or ammeter, whichever way you want to spell it. Put the suggested prop on it (or whatever load your situation requires) and run it at full load with a full battery. Remember, Ohms law, the higher the volts, the lower the amps, the lower the volts, the higher the amps. www.Rc-Help.com
@@RcHelpDotCom My setup: motor 650 watts, esc 45, battery 3200 maH, 20c. from your formulas, now I'm concerned about smoking the 45 ESC? It was in an ARF, (except battery, which I bought).
Thanks for your quick reply.
let's take Turnigy 710kv as an example. the spces( Battery: 3~5 Cell /11.1~18.5V
RPM: 790kv
Max current: 40A
No load current: 1.8A
Max power: 715W)
According to your equation, if I will use 3 cells battery.. to calculate ESC: 715/11.1 = 64 Amp .. which is not correct .. the max input current is 40amp.
my point, power value is changed according to voltage (# of cells).. I hope that I was able to deliver my point .. btw, I like your channel :) :)
So... Can I use 350A(50C, 7000mAH) battery with 60A ESC and 60A Motor(Brushless)?
Currently looking for an esc to go with my motor. The motor is 1770 watts and my batteries are 11.1V 30c 3 cell. This means it's drawing 159 amps? So I need minimum 180Amp esc. But then I do the battery maths and work out that my batteries can only put out 66amps anyway? So I need new batteries as well now? Trouble is I can't seem to find a motor small enough using the maths you've provided. The stock motor in the rc would not have been appropriate in the first place? Please help ?
Does this apply with rc truck an cars I'm wondering if my 120 amp fastwin esc will power the traxxas 2200kv motor
Yes, it applies to those as well. Don't get hung up on the KV, that is just RPM/Volt. You need to know the wattage or amperage of the motor.
@@RcHelpDotCom ok sweet thanks man scratch the other comment asking again lol thanks a lot
so i have a 1400 kv motor for my park flyer.... i run 3 cell lipo.... using your formula my little 80 graham motor is pulling 126 amps? is that correct?
I have 2200 mah or 25c battery which ESC and motor to be used for plane
RcHelpDotCom what other things r need ed
Hi Tony, Is there a way to calculate the watt rating from the motor Kv rating and voltage? The E-Razor 450 has a 2750Kv motor so what would this equalte to in watts?
The motor I have is a Turnigy G46 (670 kv). It lists a 12x8 ~ 14x10 prop. That's pretty broad. Is there any rule of thumb as to what might be closest? I understand a lower kv may often require a larger prop. On a side note, I have a watt meter on order... so I'm glad to hear your recommendation regarding that.
Pay attention to amps rating because too many amps will spell disaster for your motor and esc, stay within the motor and esc ratings ,if your motor is rating 40amps the esc should be 50 amps pick a battery that can handle the highest motor rating . 2200 at 20c is 44 amps ,get it.
Any recommendations when it comes to LIPO Charger/Discharger units?
Hi, I'm new to building, and just picked up a new Himax outrunner motor, it is a HC3514-2900 800w. I think it is a funjet set up with a Phoenix Icelite 75am ESC I know it has a lot of power but I'm making a big airplane with 70in wings it will weighs about 4 to 5 pounds, is this a good motor for my set up?
I'm a little confused but because of I'm a noob, not for your video! if I understood, if I have a 500watt motor, with a 6s battery I need a 35 A esc, with a 3s battery I need a more powerful esc (70A) is that's right?
Yes ,you are right.Lipo are more reliable in power supply.
But as just a confirmation I need.Li ion will work on my ESC.
One more thing.
Do it need any ESC programming change.