Overvolting an electric bicycle motor for more speed! Q&A#7

[@jimhofoss9982]

good that you mentioned the controller capabilities. it is important to know what caps you have inside, and keeping the amps down when overvolting. Should be mentioned a motor running at 50 volts/10 amps, is more efficient than a motor running at 36 volts/ 13.8 amps....both using 500 watts. less amps = less heat losses. But going fast is not as important as STOPPING. Even if you do the necessary tweaking to improve performance, please upgrade your brakes on your ride to keep everyone safe, not just you, but the people you are cycling around as well. Getting clipped by a bike going 30 miles/hr is not the same as getting clipped at 20mph.

[@Meme_supplier]

How can you bring the amps down?

[@jimhofoss9982]

@@Meme_supplier less twist on the throttle….more legpower/lower assist level.

[@user-rl6fs6rd7m]

@@jimhofoss9982 I don't think that's what he meant man.

[@joshnabours9102]

Motors are extremely similar to power supply transformers in design. Both are rated for a certian current continuously based off the size of the windings used in the motor/inductor/transformer. So it is more accurate to look at the continuous current rating and the power rating (KW) when comparing motors for use in an e-bike. Also it is important to look at the cooling design of the motor and control electronics. Even if a motor or controller is more powerful, if it does not have adequate cooling to run at that power level continuously you will burn it out. Conversely, you can run a smaller motor or controller at a higher power level (to a degree) if you have more than adequate cooling on it. You will take a bit of an efficiency hit doing that though as a somewhat higher percentage of the input power is wasted as heat.

[@johnconnor6725]

I've been running my direct drive 36v hub front wheel off a disability scooter as the rear wheel on my DIY disability scooter at about 82 V DC and love the better efficienty that it gave me

[@mariodabek1441]

i use a dc > dc booster to run my ebike batteries at 60v. The caps in my controller can handle 63v. And that's 60v under load, so 38 MPH on my bike.Way better than my 52v running stock which is 58.8 and drops to 53v under load. And my 48v which runs even slower. Anyone who runs a bike should consider this option. All my 48v and 52v batteries are running at 60v all the time using the booster

[@jonk8337]

I’m thinking about doing this as well and just use my 48v battery. I’m currently running a 1000w motor with a shunt modded controller that have 80v caps inside. I want to use a booster instead of changing the battery. What dc to dc booster are u using?

[@ammerudgrenda]

The speed increase will be a lot less than 44%. 20% is maybe realistic. Rule of thumb is that doubling the speed require 8 times the power. Hill-climbing is where you will see the biggest benefit.

[@uncrunch398]

Overall range as well. Unless you custom make a battery just for higher output with same number of cells. Often a higher voltage pack is also higher total capacity.

[@andrewstephens2687]

To clarify the formula he gave is not off, its just that it gives you the "unloaded speed", or the speed of the wheel spinning in air with no resistance.

[@yrr0r244]

Its important to note that motor power does not increase with voltage linearly. Certain motors can have a huge increase in RPM with just a little voltage boost. They have a KV value which indicates how much it spin faster when voltage is higher.

[@theSWBFman]

Does increasing current just increase torque and acceleration, and voltage the top speed?

[@config2000]

Wow thanks for answering my question, and what an utterly thorough answer too! I'll drop you a private message.

[@jonnyroy]

Motor maximum voltage is defined by the maximum field strength in the stator saturation, heat and isolation strength.

[@quentinrufin4025]

Thank you for your comment. Can you expand on this?

[@ronbrown8611]

please expand in complicated form and in simple laymen terms

[@AfdhalAtiffTan]

is there any way of measuring saturation?

[@daylankp1]

So, will more copper windings help to increase the voltage?

[@rogerkerkmann]

Until it melts, nice if they all had thermal cutouts.

[@BreadsJuly7]

My name's Brenda, and I have a magnum E-Bike classic like rise II and I am trying to find the best way to increase my speeds to maybe 35 mph since the minimum is 24 and also, trying to figure out how to program the display to show battery percentage rather than v. or find a new a new battery that can extend the battery life to at least 5 hours on a full 100% charge. Thanks.

[@roberttatro97]

Will a 72v controller work with a 52v battery

[@justbanter8727]

ty Great vid A Standard brushless e-bike motor rated at 36V will easily handle a 48V Battery, despite the doom and gloom 'rolling fireball' comments lol - just be sure those capacitors in your controller are rated at 60V and you'll be fine, as you pointed out - its a relatively easy swap-out (basic soldering) if your capacitors are rated too low.

[@austingeorge6659]

Thank you so much for this information! Just got my support ticket back today regarding my technical question from FLX! So pumped to [destroy] modify my Babymaker II settings!

[@RobertSeviour1]

Thanks for the informative piece. I would prefer to hear you talk without the music track in the background, it's distracting.

[@hoverbotfpv1425]

I got the 36v brush motor over volted to 48v and the chain drive well aligned. I saw you review after but I have a brushless front so just a bit extra. Check your controller capacitors before over volting!

[@poseyperspective3591]

So many of my questions answered in one video! Thank you!

[@NSCA12]

Thank you for the lesson. I am now a subscriber and am awaiting delivery of first my e-bike. Thanks again.

[@sedhendo4177]

Whoever asked that question thank you. And thanks for a complete answer also👍🏾

[@solosword593]

I'm 55yr, just getting into e-bikes, thus will be buying your books on Amazon. Thanks for the information Brother...:-)

[@tfargo7818]

5 years it’s been good sir, are you enjoying ebikes still?😃

[@MaureenWhite-r8j]

Was going to ask same thing lol

[@JesusChrist-sx1lf]

4:48 How exactly are you current limiting the controllers to 11 amps? Is this an in-built feature, or how are you achieving this?

[@hotchihuahua1546]

I like to hot rod things , it’s just me since I was a kid . Heat is not your friend so don’t look for reliability . When I was slot car racing I use to rewind the motors with heavier wire but less winding , those motors would scream but my hand held controller would smoke from the amount of heat it generated .

[@dwcola]

How about the battery. You touched on the motors and the controller (capacitors). Does the battery being drawn down faster that it was rated for cause more degradation due to higher discharge rates?

[@hispronounsaretheythem]

Thinking about building a 16S4P 21700 (60V 20Ah) battery for my electric scooter (Yokamura i8), currently have a stock 13S5P 18650 battery (48V 15A). I have a Flipsky 75100 with Alu. PCB controller, and I'm pushing it up to 60A of phase current, and I'm very happy with the torque, but the max speed is only around 45-50 km/h on max charge and even less when the voltage decreases to

[@powerup2993]

Thank you for your informed information. Could you comment on the different 'Watt' rating of ebikes and if the different ratings are achievable by overvolting ? Ebike kits sold include 250w, 500w, 1000w and 1500w,. Is the difference in the controller ? Would it be possible to overvolt, and/or use a different controller to get more powerful ebikes? - Thank you for sharing your knowledge.

[@EbikeSchool]

I wrote a longform article on this here: www.ebikeschool.com/myth-ebike-wattage/ but that would make a good video too, I'll add it to the list.

[@rohankumarchauhan9653]

Sir if i use 48v battery pack in my 36v pmdc moter , will it burn the winding of moter?? Please reply atleast ,yes or no please

[@rohankumarchauhan9653]

@@EbikeSchool please reply sir

[@TheSkyPod]

@@rohankumarchauhan9653 How did this work out for you ? I was going to try this out myself . You were never going to get a reply if this guy has over 200,000 subscribers . Just too busy.

[@rohankumarchauhan9653]

@@TheSkyPod I'll use a 48v controller ,in 36v moter , I don't know it's results 😅

[@FredoCorleone]

THIS IS THE EXPLANATION OF THE COEFFICIENT USED IN THE FORMULA: .1 the tire diameter is 26", multiply by 2.54 to obtain centimeters measure, so 66.04cm. Then you need that measure in kilometers for the calculation of km/h, divide by 100000 so 66.04cm ~= 0.00066km. - keep note that you multiplied by 2.54 and then divided by 100000 - .2 the circumference of the wheel is "diameter times PI", that means in a whole turn of the wheel you will travel approximately 0.00066km * 3.14 ~= 0.0021km. - keep note you multuplied by 3.14 - .3 RPM by its acronym means Revolutions Per Minute, so to calculate how much you travel in a minute you multiply your motor RPM by the result obtained in .2, and for the sake of semplicity we will use 300RPM and so 300RPM*0.0021 ~= 0.62km/minute. .4 to obtain km/h just use the result from .3 and multiply it by 60 (infact if you travel X amount in a minute you will then travel 60 times X the amount in an hour), so 60*0.62km/minute ~= 37km/h - keep note you multiplied by 60 - All pure numeric coefficients can be treated separately so (2.54 / 100000) * 3.14 * 60 ~= 0.0048

[@afonsomarques7173]

Thank you!! :)

[@garryhollis1386]

Hi Micah, Can you use a 1200-1500watt 48V motor controller on a 48V 1000w brushless hub motor?

[@Bob_Lob_Law]

Garry Hollis Yup. Just make sure it doesn't overheat your motor.

[@rhiantaylor3446]

There is a lot of potential confusion on this topic. The controller can only adjust the average current through the motor by limiting voltage the motor sees - typically with pulse width modulation. If you reduce the current limit setting, the motor will never get to see the battery voltage available except in terms of very short peaks (milli-secs). Left unconstrained by the controller settings, a higher battery voltage will increase the current draw as well so the potential power increase is a lot more than the % increase in voltage might suggest. A "500w" 36v motor represents a 2.6 ohm load. An increase from 36v to 48v (33% increase) will cause the potential current draw to increase by 33% as well, so available power increases by 78%.

[@geneskare175]

Hello Mica my name is Gunny I over voted an E bike that had a controller for 36\48 volt 22 amps motor came rated at 36V 750 watts I accidentally mounted a 48 volt battery rated at 1000 watts. My friend was buying it from me, while riding to the store and a friend's house all within a 5 mile radius of his home. He believed he had at least 20+ miles on 1 battery. He is not a heavy person 125 lbs. soaking wet.lol😊 on his way back home, about 3 miles , the wheel tightened up got real hard to pedal he said it was like the brakes were on. After disconnecting the controller the.wheel spun freely again. Discharged the capacitors and reconnected everything and as soon as he pedaled it did it again! I installed different controller with display got it going told him NOT TO engage the PAS he should be fine. It was until he decided to put a riser on the handle bars. He forgot when he reconnected it went back to default mode locked up magnets so I went through the same ritual trying to expect different results. HELP ME PLEASE. I'm pretty damn smart dude but this has me stumped. I can put the motor on a different controller and it works fine. Is his wiring ( actually my wiring) F€¥¢π÷× Ed up or is there something I missed. YOUR HELP IS GREATLY APPRECIATED AND THANK YOU.

[@michaelashbrook3195]

some of those 36v bafang kits are sold as 48v kits. my one is 350w @ 36v or 500w @ 48v. according to manufacturer specs

[@tinsengwu5419]

Hi Micah, I have a peddle assist 24 volt bike. I understand from this video that if I replace the 24V battery and the 24Volt controller both for a 36Volt one without replacing the motor it will function just fine? or are there other things that I should also take into account? Regards, Tin

[@Slab_City_or_Bust]

Shouldn't you be calculating circumference rather than diameter? Diameter x pi 3.1415 I think the surface of the tire = 1 revolution. If I'm wrong, please explain.

[@roberttatro97]

I have a 1500w hub motor with a 52v battery. I cant get it past 31mph.. How can i get more speed...

[@martinbutcher4305]

If you have the SW9 control panel LCD then you can go into settings and adjust the top speed

[@aldisgarais]

Hello i built AWD Ebike 48v. Front 350wats and 500watt rear. And i have two battery packs but the rear hub doesn't fully use the battery. It stops at 52volts. And don't know what is wrong? Is the controller wrong?

[@RichardRCGuy]

Hi, Richard Stuart here, have an Ebike with a 48 Volt setup, and a SW-900 The Controller doesn't seem to have a name on it. Does say Max current is 22 Amp. From what I have read it should work also at 52 volt level. What else, to be safe, should be checked.

[@richardgithens1710]

I need a guide book and how can I use 2 48v batteries to get full power from them

[@mikeeimperial3822]

Sir my ebike is said that its 48v hub motor, my battery is 48v also, can i overvolt it and make the battery as 60v? Would thia give a bad effect in the motor? Thanks sir

[@waylandlively7550]

I love the knowledge you have behind your reviews! I have a 36 volt battery on my ebike! I'm pretty happy with the speed, but I would like to increase the distance of the ride (I am 6 foot 250 lbs.). Right now I only get about 16 miles out of my battery! So how do I increase my distance of the battery to about 25 miles?

[@waylandlively7550]

@@peterioannou9266 I am not sure what you mean exactly by connecting parallel! How? I mean there has to be a specific what to connect without danger of explosion or corrupting the power!

[@peterioannou9266]

@@waylandlively7550 .Just get a bigger amp hours lithium ion battery.With the same voltage..Use your existing one for a back up .Example 40 amp hour 36volts battery gets you 15miles.Replacing the battery with 80 amp hours 36volts your mileage should be about 30 miles.And you will be safe with this setup..The battery will be a little heavier in weigh..

[@waylandlively7550]

@@peterioannou9266 appreciate it!

[@peterioannou9266]

@@waylandlively7550 you are welcome

[@HDsharp]

@@peterioannou9266 what happens if you buy and fit a 48v battery instead? Would that be over volting the motor as explained in this video?

[@deejay1569]

I have a question about amp. My electric trotter one wheel operates on 48volt 8amp , which gives me roughly 6.5 miles range. If I want to double my range, do I buy a battery that is 48volt 16amp, but will the higher amp burn out any electronic components? What amp do you suggest I safely bump up to?

[@AgusPrabowo224]

see your controller spec..

[@markdawson808]

You're on track, double the amp hour rating of your battery will greatly increase your range and will not harm anything electronic. It's as if you doubled the size of the gas tank in your car, you would roughly double the range of your car. Of course, battery will weigh about twice as much and be sure it will fit in your bike.

[@wb5648]

wouldnt the extra voltage also effect temperature of the motor?

[@bentafee1192]

Can you make a video about how to check how much volt the controller can handle?

[@BK42Cycles]

Thanks Mike. I am considering a new build and it is gong to be electric. Your channel and tips will help a lot.

[@welcometomychannelswelcome7261]

Thank you for your information. This is what I'M looking for.. I have a cheap ebike ancheer 26in 36v 250w . Can I overvoltage the motor at least 48v maybe 52v. Do I have to change controller also?

[@gatecrasher1970]

am wondering about this also as i have greenedge cs2 ebike

[@faysvision1323]

Me too

[@Todd_G_FPV]

Check the voltage on the capacitors in the speed controller and stay under that and watch temps and u will be fine

[@sunnybeaches1331]

Thanks, great video. I use my 3 wheeler for everything, shopping, banking, yard work... I run a 48 volt, 1000 watt motor topping out at 29mph when fully chatted to 54 volts. I WANT TO GET 45 MPH. Would an upgrade to 52 or 72 volt battery help and can I do it. I.have a 30.amp controller.

[@mrkeopele]

I've got an A2B Alva+ 26volt 500Watt Ebike from 2014, it is incredibly built, unfortunately the axle spun a little and I have the wheel off to repair the wiring going into the motor, and surprise, no fastening hardware on the outside of the motor, which has a large UM stamped into the case. How do I separate the covers to get to the inside? there are 4 small grooves cut into both halves of the motor shell. Like maybe it is a srewed together clamshell design. Do you know?

[@egoat5082]

Hey Mika I have a question. I want to make an ebike with a 1500w rear hub motor, but the battery is the issue. I was deciding on getting a 52v 17.5ah battery that mounts on the downtube, but then I found a 72v 20ah triangle battery for cheaper! Would running that battery burn out the 1500w motor rated at 48v or would it be safe? Thanks.

[@axlakaisuzu]

6:27

[@jasonmiddleton2375]

I would recommend upgrading your controller to be on the safe side,

[@jasonmiddleton2375]

Your motor might get hotter faster then normal but with moderate use, it should be okay

[@RobtAWhite-gz3jb]

Good info on e-bike 48v controller and overvolting your motor(s). How would you install a generator 12volt?

[@anze2565]

Can you do a video on safely connecting two 72v batteries in parallel with different amp hours? I have a 50ah and a 32ah battery and my ebike is a huck cycle stinger with a 3000w motor and a 150amp controller. Both batteries have BMS controllers and bluetooth capabilities.

[@senurasenaratne5782]

But the shielding in the copper wire is it rated for a certain voltage, if you go high voltage the current will jump and short?

[@johnwehner3549]

Thank you for this information. Looking to replace my burned out controller. Can’t find the exact one because of size. Do you have good source for controller’s? Can I get your book on line?

[@flitsies]

I have recently bought your book on diy lithium batteries it makes for an interesting read, I bought it based on jahugarcias recommendation and am not disappointed, good book. The idea of over volting a motor is interesting, using 18650 cells you could up the voltage incrementally, ie by 4.2 volts so take it to say 42/46 volts thus keeping it well within the capacity of the speed controller and giving you extra speed. Now if you could only get the makers of these batteries to sell them at a price we could all afford especially in the UK then that would also be a huge step for human kind. example of what i'm talking about is this, I just bought a 15 ah 18650 battery pack which cost 260 pounds which is probably around 300 dollars or so, compare that to the price of the cells in the USA and i'm guessing it would be a hell of a lot cheaper. So you can see why electric battery bikes are not that popular, apart from the obvious restriction on motor size being 250 watts, and are speed restriction of 15.5 mph, which most people can run faster than, but hey laws are meant to be bent right.

[@EbikeSchool]

Yep, the mistake was already pointed out to me but thank you! I've already submitted a correction version!

[@flitsies]

But no link to down load it so it can be added to the book that we already have for those who have already got your book. Just a suggestion but if you have a link to a web site those who already have your books could down load updates to the book for corrections. After all putting pen marks through pages where mistakes are is unsightly on a paper back book, but a copied page inserted is better. So even though it's good you have made the correction for your book that is printed from now on, but how about doing the same for those who already have your book/s. It's a good book.

[@czarzenana5125]

If you are within the UK you can buy decent original batteries at nkon.nl for a very reasonable price.

[@4538s]

Hi mike, is it possible to add a display on the controller that dont have display connector ready, if you can please let me know how to do it. Thanks in advance RUEL

[@davidgilbert3351]

Good video. I am building my 1st ebike and appreciate all that you have shared. When you mention that current limit should be reduced while overvolting how do you make that adjustment?

[@myscreen2urs]

Mike, I have a questions. I recently upgraded my motor and ever since then, my controller has been running super hot. I assumed that my controller was under spec'd so I bought a new one to match my 1200 watt motor. But all the other ebike experts assure me that there's no such thing as an "under spec'd" controller. They did helped me trouble shoot the problem and I discovered that I had dead hall sensors. Which explained why jerky offs from a dead start. (I always have to make sure I push off before I twist the throttle). But I have this nagging feeling that this may not be the cause because I had that experience with take off on my previous motor and the controller wasn't getting hot at all. What do you make of this?

[@FingerStink420]

Thats the thing. You can overvolt your motor but not your controller.

[@sunnybeaches1331]

I dont know if you will read this but if a Hall sensor goes, your bike (at least MY trike, WON'T RUN. What Hall sensor is bad? If it's your throttle, REPLACE IT. My trikes throttle sensor was out, trike did not run. Replaced and it was fine. Hall sensors cut off the power all the way when they go out. In my experience. Good luck!

[@myscreen2urs]

@@sunnybeaches1331 I was using a dual mode controller that could run sensorless at the time. Bigger motors draw more amps in my experience despite what anyone will tell you

[@markdade1250]

Dude this is awesome!! Most excellent!! I've got a 1500watt rear wheel 29-in with a 48v controller. My question is can I use a 36 volt 8 amp hour battery without burning something out? The answer is probably pretty obvious but I don't know for sure I mean I get the idea that more is going to be faster and would be best to get a battery that has 1500 watt or 2000 w 48 volt 52 volt or 72 volt and as far as that goes what should I best invest my money in without paying six or seven hundred dollars for a battery I'm willing to pay $350 but again what do you suggest. Now I live here in Eugene Oregon and while it's pretty flat terrain there are still some hill in the areas that we need to go over bridges And it helps to have that little extra power to boogie on down the road. It's all about the amp hours that I see the price of batteries at a higher rate even if it's only 1,000 w 48v if it's got a 20 amp hour or a 30 amp hour it's going to be a much more expensive battery. So also understand that 48 volt compared to 52 volt or 72 volt is going to be quicker off the line and a little bit faster when it comes to the volts but it's the watts is the speed I think right I don't know I would think that makes sense right if compared to say a 2000 watt to an 8000 w or a 12,000 w I mean it's obviously it's the difference between doing 30 mph and 90 mph which is crazy and really dangerous to say the least. But so I'm back to my original question I have a 29-in 1500 w rear wheel motor with a 48 volt conversion control kit and I'm looking for a good battery that will work well without burning anything up and have longevity so I know that the more volts the more amp hours the better and a 1500 w is more than enough to get to that 35 40 mile an hour long range battery life charge that will get me anywhere between 50 non-assist to 80 to 100 assisted.

[@HDsharp]

Would i risk burning out my controller box that controls a 24v motor by using a 36v battery? The problem is i cant gain access to the control box to see what it can handle.

[@justlife2129]

The speed of your motor is controlled by the frequency supplied by motor controller. The overvolting will increase amperage hence power output. The extra power will create stronger magnetic field which will create more torque.... You do get faster by overvolting because you get extra power and having the same weight(resistance) you will ride faster. Your theory works with brush motors, but you have brushless motor.

[@deian85]

Are there any motors that have an internal temperature check? And shut off if it gets too hot?

[@Ozkar2023]

I need to replace the wire into the motor but noone would fix it for me the tutorial on KZbin seem really hard to pull the cable out and you have to solder the cables etc i dont even have the tools so i want to replace the wheel but they dont selll 350w 36v only 48v 500w ... question can i still use the same battery and 36v with a motor that needs a 48v? Under voltage? Can it still perform as a 350w without any problem?

[@wesley20991]

Maybe I missed it but do you need to change the controller or upgrade it to change the voltage

[@colekeller]

What would your thoughts be about overvolting the bafang 750w hub motor to 60v? Is that too high? It seems like the industry is moving up from 48 to 52 with this specific motor and I was hoping you could speak on if taking this motor to 60v would damage it. Cheers and thanks for all the great info!

[@StudentTrader]

It should not MOST 48v controllers can handle 63v but be careful not to let it blow up!! Open the controller and see the Capacitor limit I’d be careful

[@ahmadf.8727]

Did you try it?

[@mariodabek1441]

it works 100%, I run my at 60v

[@rafaelsacco]

Do you know about Emmo bikes? I have a 48V and I was wondering if I could use a 52v battery on it.

[@ClownBot-st4pn]

Thanks for the tip on the 2WD throttle wiring. I think I will build a 2WD 2x1000W bike.

[@huckfin1100]

You published that formula for speed in a book and if it was your friends, yeah I see a suit coming !!

[@tombuickweber2708]

Hi is there anyway you might have any information on the different dimensions of a lithium scooter battery, I took a chance and bought a 36 V 60 amp hour okoman brand battery and they’re telling me it’s 188 mm x 68 mm x 78 mm and from the research I’ve done it shows that this dimension is for a 10 Ah power.So I’m wondering if you have some kind of a chart or knowledge that you can help me. Please get back to me as soon as possible. Regards time

[@anirudhramprasad3994]

So ideally I don't need to use 3.7v li ion cell I can use 3.2v LiFePO4 even if it 12s BMS. That should have no problem at all right?

[@ybfleming]

Sometimes I see controllers advertised by the number of "TUBES". What do the "tubes" refer to? For example "The 12 tube controller is suitable for...", "24 tube controller", " "Dual Mode 18 Tube Sine Controller".

[@EbikeSchool]

Tubes refers to mosfets

[@arconreef]

fyi the formula used in this video does not take into account aerodynamic drag, which increases with the square of your velocity. It will significantly overestimate the top speed of bikes with more powerful (2000+ watt) motors.

[@sedhendo4177]

Do you have a step by step video on how to setup your brushless speed control settings with the l.e.d display for the best performance??

[@jesseherbert2585]

Looks like a suspended front fork? I busted Al dropouts with an old 350 watter, are those steel or just beefy? No issues ever with that? Max power to front in normal use? Nice to see!

[@frankytyers]

I am replacing my 36 volt ebike battery and will probably purchase a 48 volt battery after seeing your video on youtube. Looking for advice on motor wattage. There is no markings on either the hub or the battery as to what watt they are. Should I purchase a 500w or 1000w battery.

[@Jay-tr3px]

Hi. Thanks for the how to video. I was wondering how you can adjust to increase the voltage and or current of the hub motor in the controller? And do I have to get a higher voltage battery for my motor if I increase the voltage of the motor?

[@glennmorgan4197]

I have a 60volt EV-RUNNER that has 5 batteries and room for 1 more, can I add one more without changing the controller? I can't identify the specs on the controller since it's in Chinese

[@philippinedawn4631]

As an expat from Texas I wonder where you are filming. Is that Galveston?

[@Oponu-Ayirada]

Thinking of upgrading my battery from 48v 14AH to 52v 20AH, do I need to upgrade the controller too ?

[@pcgameplay9739]

What if i have a 36v battery can i set the controller to 48v? And will the motor use 48v or just still use the 36v? What i mean is are batteries the same as motors and will give you the higher voltage if you can set it on the controller like i can? I've got the 850c and will be getting the programming lead eventually to configure the extra settings that gives you like realistic acceleration and what not.

[@solarsynapse]

Accurate info well covered! Current kills...people and motors. Most of the insulation is rated 600V or higher. If they made motors with internal liquid cooling, they could be pushed extremely hard! 18650 cells can't deliver high current without many good ones in parallel. That (and smaller wires) are the reason they go higher voltage. 21700 cells can deliver more current and hobby LiPo packs can deliver massive current.

[@sedhendo4177]

Can some tell me why my Escooter motor make noise then looses power once I’m moving. I can move from a stop nice and smooth. Then right as it’s about to really get going it falls on its face. And once it has slowed a bit I can get back into the throttle and then it happens again. I have swapped to a new motor then to a new speed controller. Then I also tried a different throttle and still the same issue. Any ideas out there???

[@elahwentv8086]

how about 48v ebike run by 36v battery, will it be possible? is there any issue also with the controller?

[@rasheddawabsheh]

Mike, is it possible to design it to be charged by different chargers at the same time to reduce charge time? and how much range difference would it be when using highest quality 3500mah 18650 cells vs regular pre-made packs from china? you always manage to make concise and to the point!! thumbs up

[@samguapo4573]

I need to go uphill. Will increasing the voltage help? Or should I increase the amps? Which will be more detrimental for the motor? (which generates more heat?)

[@princecharles3452]

More amp: more torque at the same speed More voltage: more speed with more toque and more efficiency at low speed. Its always better to increase voltage but not too much to generate excessive heat.

[@scottshinsky8237]

#ebikeschool I have a question? My controller are gone for 36 to 48 says it’ll handle up to 52 but I want to know if I change it to 48 and I have a 36 battery can I use both batteries switching back-and-forth?

[@FurkanOz480]

Idk how ampere hour works but i found motor with 1000w 52 v its like 18 ah but i founf batery 52 v 38 ah and 1000w does it matter if the ah is high pls help thx

[@DrGreenThumb135]

Dumb question maybe but when I overvolt my ebike motor do I need to use a higher voltage battery? Thanks!

[@332jatc]

if you have a 36 volt battery and a 48 volt charge controller can you run that with the 48-volt throttle can you put a 36 volt battery on it still work it will it work can a 48 volt system go to a lowerand not mess up the throttle or the controller the motor suppose they can protest out I'm assuming that's no big deal

[@harrykelly4651]

How would a 1500w limit speed controller handle an extra 400w The bike is already 1500w but runs 60v 33ah so should be 1980w so would the contour have a limit or would adding an extra give me more top speed

[@TheCohesiveGarage]

Awesome video, It gives me an idea for my Ebike. What do you think? Currently I have a 52 volt 13ah battery running a (rated at) 1500 watt motor. My controller is rated at 30 amps 52v. It hits 28mph on flat and has a range of about 25~miles. Im thinking to add another identical 52v 13ah battery. If I wire up both batteries in series or parallel what would I get? Should I also switch to an upgraded 72V 3000W 100A controller?

[@robmckenzie8971]

I've got a 86 volt controller what can hold up 100 amps

[@robmckenzie8971]

My battery is 126 volts but I use a sw900 to lower it down to 72 55 to 60 mph 350w motor it takes about 15 s to 20 s to get to full speed

[@njm663]

Hi could yyou please tell me if there'i a problem use the 24v 36v 48v KT LCD3 with 52v(58v) Battery without damage the LCD3 display? Thank you.

[@stevedonovan9265]

If it's assumed a motor's stated voltage from the factory is directly related to safe heat level then I would be careful giving it more than it's rated at least for prolonged intervals. The more pertinent issue is the temperature at which the motor windings are designed to operate so they give a long and predictable insulation life.

[@EbikeSchool]

Yea you have to watch the heat build up. If it's staying relatively cool, you're fine.

[@ROBIX008]

Hi, can i ask you something?... i made a bike using a 500w hub motor, not sure if the motor was from an ebike or not, because i had to make a ring with holes to assemble the spokes of the wheel. (It has 3 phase and hall sensors and its brushless, gearless) The bike its a bit heavy, about 40kg (88 pounds), and the motor gets hot after few distance. I cant lighten up the bike right now, but im using a 350w controller to power the motor, what i need to know is if the motor will work with less effort with a 500w controller and so the temperature will fall down or its going to ride better but get even hotter. (Im now using a square wave and the 500w controller will be sine wave). Im in south america and getting this kind of parts as controllers is not easy at all, thats why im asking first! Thank you very much!! Your videos are great

[@RoamMeYo]

I remember reading that the number of windings are also a parameter to determine the speed of the motor vs volts input.

[@EbikeSchool]

Yes, more turns per copper winding results in slower RPM.

[@ashtonbeattie8902]

does increasing the voltage decrease the amp draw? does this lower the torque of the motor? I have a very beefy motor that is rated for 96 volts and it is currently running off a 52v battery. I want to increase the speed, but I also want to know how this will affect the torque. I don't know what model the motor is (it's a crystalyte hub motor) but the on board computer says it draws 1500 watts at 52 volts, which means it's pulling 30 amps (admittedly not very much for a motor this size, and it would explain why it has a little trouble with steep hills). So my question is how will adding a 96 volt battery change the amp draw, and how could I keep the amps the same/increase them to 50+ amps in order to increase torque?

[@fatlindbytyqi1684]

As long as the battery you buy is rated for 30 amp current then it wont change. Its the controller that determines how much amps is supplied.

[@One_way_Erik]

Hey I have a e-bike running at 48 volt 20 amp and I’m looking to buy a battery thats 60 volt 24 amp all I have to do is buy a new controller that supports 60 volt 24amp right? Correct me if I’m wrong

[@makeyourownsystem2425]

Hi, Mike, very nice video... :) can you make video from controller, to find out the capacitor how much voltage can take? best Regards

[@GR-bv4hm]

Great video!!!! How can I get your books?

[@deathincarnatesplace]

hey you seen the one where the guy made a hub motor into his sprocket and doubled his mileage(after burning up a motor) by changing to a kids ebike bms so he didn't fry the motor. I think it was his kids bike and he stole it from him because it ran at half the power. the both ran on the same battery and that is why his kids could keep up.

[@CaliforniaBushman]

Can 18650 Ebike batteries be charged at a level 1 - 2 ECar charging station? If you get thicker gage wires and the proper charging stn adapters & components? Or are 18650's not able to handle the higher amp quick charging loads like that?

[@steebbrell835]

Can I put an 36v 800 w controller on instead of a 36v 500w controller .....both 36v for a 36v 500w hub wheel kit

[@normanharris782]

Can I put a 96 volt battery to power a 100 amp sabvoton controller? Capacitor's are 100 volt ?

[@GameMaker04]

I have a question.. I shunt modded a seeker24 dual motor, in the psettings I can change amps the controller uses or pushes.. its current 20ams.. but the controllers are rated up to 25.. would it be safe to bump the p-setting to say 22 ? would I see any speed or power increase ? Motors are both 1000w, I have my controllers Resin Potted and added ventilation.

[@Master-AGN]

How about “under-volting” 48V non-geared motor. Why? Because no room for 48V battery. There’s no difference in price but it’s hard to find a 750 W 36V motor on Ali

[@NathanMellor]

Is overwatting a problem? Like if your motor is marketed as 36V 350 W but your controller (and battery) are capable of 500-800W.