No! The reason for using higher voltages is to reduce the IxR losses due to resistance thus voltage drop of the wires providing power not only to the motor but also in the motor its self. If you used a 6 volt motor you would have to have wires as thick as your finger to wire it as in old golf karts. The battery would be the same size just wired for 6 volts.
I also think you could go further if you double the voltage without increasing the amp hours, because less amp is required at higher voltage to provide the same power.
Roger Jordan all motors are designed for a specific voltage and voltage drop For most industrial motors it is usually 10 percent Motors draw more current when the load (horsepower requirements) increases as a motor draws more current (Amps) the voltage drops if the wires are large enough and the voltage is high enough and the load light enough than the drop is minimal but if they are not than the motor voltage will be below design limits . . . so a 6V motor cannot produce max power below 5.4V but a 48V motor is still able to operate at 43.2V and requires 1/8 the current of the 6V motor to produce the same amount of horsepower (Watts)
I would say Volts is like an elevated water tank that keeps magically comes down with usage to finally have no pressure, and amp hours is the hose that connects the tank to the garden. Wider the hose, more water. Taller the tank is, more water comes out for the same hose.
not really... Watt Hours (or Volt * Amp hrs) = fuel in the tank! In other words: the combination of Volts and (*) Amps will bring you forward (=) Watts. The capacity of a battery is measured in Watts per Hour Wh. So two same size batteries with 36V and 48V with same battery cells have the same capacity (Watt Hours, Volts * Ampere Hours) that means they do have the same driving range even with different Volts and Amp Hours. Same energy density but different volt/amp ratio. So if you drive on higher voltage with same speed then the motor typically needs less amps. This means you use about the same Watts (Volt * Amps). So higher battery voltage has typically higher MAX power but can be as efficient as a lower voltage battery if just drive as slow. Hope that clarifies.
You could design a 36V system that would perform exactly the same as a 48 V system, but to achieve the same power, the 36V system will probably require thicker wires to accomodate the extra current. Higher voltage is usually prefered to increase efficiency and lower cost. Watts and Wh are what matters in the end.
Another thing that needs to be mentioned here is that a battery with Higher Amp-hours will likely have less voltage drop under load than a battery that has less amp-hours as it would have less internal resistance especially as more cells are put in parallel or even the quality of the cells, so you can have less energy being wasted in the battery due to internal heating 250W Motor used Say a 5AH 24V Battery has 28 Volts no load 25.1 Volts under load when riding So the motor still needs roughly 250 Watts of power: 25.1 Volts from the battery under load and 250 Watts of power demand under load means 9.9 Amps So 9.9 Amps X 25.1 Volts is 250 Watts. Compared to a 10AH 24V Battery that has less internal resistance and can comfortably output more current thus causing less of a voltage drop: Say the drop becomes 27.1 Volts since the 10 AH Pack has the resistance reduced multiple times from having more cells. 250 Watts are still needed to run this motor continuously. 250 Watts Divided By 27.1 Volts from under load would be 9.22 Amps. This would mean that you now have a motor that can do more work since it has slightly more voltage under load, thus meaning better hill climbing capabilities, and higher average speeds. On top of that, your motor controller isnt having to pull as much current, to do more work than before. To simply this as low as possible, this is just Ohm's Law. So, if you cannot upgrade voltage, here's another reason to upgrade amp-hours to get a little more out of your electronics.
Thanks, this is the first video that actually made this make sense to me. Trying to build my first battery for a motor I think is appropriate. I'm a whiz with mechanical contraptions, but I have some difficulty crossing into motorizing, providing power and having enough. Trying 10, 5500mAH, 3.7 volt batterings that can discharge at 18amps, with a motor that is 36v motor that draws 17amp at 36v. (says max power 733). I'm just now learning this, but I figured the motor could run for 2.94hours at that speed?
This is really not the case since doubling the volt which cuts your mAh in half also cuts the Amp you will be using for the same wattage you would use for your motor. But by increasing the volt you will be able to increase the max watt that you will be able to output if you have an amp limit such as heat from wires, etc.
Yes I know and that's great it's just that I don't want anyone to give out the impression that Volt vs Amp hours is power vs fuel, which it isn't, the fuel is Watt hours.
I have a 2021 Pride Pursuit XL with 2 12 volt 75 ah batteries I added 2 more batteries the same on my trailer at the back so I have 24 volts 75 ah all together now I would like to get more miles about 60 miles if I can. what do need .thank you
Hi im confused even after watching your video. my bike claims it has 72v/45ah They didnt explain that the power comes from 6 batteries so I dont know each batteries' individual specification. now my question is do I need to pick up 6 x 12v 45ah ? Dude ill be sweating waiting for your answer lol its like $130 a battery here in canada jesus.
i have 36v 14ah 250 watts e bike, can i use 36v 40ah battery ,is there any problem motor or controller volts are same ah only increased please inform me
Can I use a 36v sistem with a 14 or 20 amp?I ask because I buy a ebike but the battery is 36v 8amp and I want more, so I want to know if I can use the same system for a bigger battery, with more amp, thanks
Ok video. You miss the mark on capacity and speed. You said a 48v 15Ah battery will go faster than a 48v 10Ah battery. While generally it is true that larger batteries can usually supply higher current than a smaller one, this is not always true. It is certainly not true for an e-bike who uses a current-limiting controller. (that's like all of them) In fact, if you increase the size of the battery with another same-type battery while remaining at the same voltage, you will not go faster or slower in top speed but you will certainly lose acceleration because the bigger battery will invariably be heavier. Your motor controller sends a max current to the motor at whatever voltage you are using, ergo a 48v 15Ah battery will not propel your bike faster than a 48v 10Ah battery assuming the smaller battery can actually supply the max current capacity of the controller. The only way to go faster is actually increasing the voltage. (because the current will still remain at whatever max the controller is rated at) Motors are rated at X number of RPM per volt input, not by current input. Allowing more current to the motor will make it accelerate faster but will not make it spin faster. Only more volts can make it spin faster. Controller 1 is rated at 20A and controller 2 is rated at 30A. You run the same 48v battery on each. Controller 2 will allow the bike to accelerate faster to its top speed but both controllers will propel the bike to the same top speed. This is only true for relatively low speeds (in the legal range for e-bikes) as beyond that the increases in aerodynamic drag become a factor and at some point the higher rated controller will allow for a higher top speed as it it supplying more power to the motor.
Thanks for the video!! Subscribed!! I build a 2000w 48v Fat tire mini bike , me on that weight approx 400 pounds and I order a 48v 20Mh 50Amp . Do you think that will have enough tork ?
I am going to buy a ebike but one is 48v 10.4ah while another is 36v 12.5 ah . Can u tell me whats the difference ? which one is better in range ? which one can go uphill better? Both have 800W motor as i know .
The 48v is sight larger in total capacity, but the battery size alone won't tell us enough to determine hill climbing or range. For example, I have personally rode a bike with a 36v 11.6ah and a 350w motor that was much better in hill climbing and range over a weak bike with a 48v 14ah battery and a 500w motor.
Ziyoujiguang T18 what would be a great controller for 250w hub motor, People say this 250w motor is secretly 350 i dont know hate to burn it up ,What to do to make it faster 36v to a 46v battery 14ah it has 36v 6ah on board does 15mph need about 25mph please help.
Great video. Question...I'm new (self taught) to electrical engineering, repair + maintenance of ebikes. I installed a 4-light system on ebike - backlight, high beam (×1) and low beam (×2). I run everything through a 12v/24v power source (bank). Recently, I decided to add rocker switch (×2) to separate high be from low beam. I noticed that the LED indicators on the rockers will sometimes work, sometimes not but the lights will always work. I've looked for shorts, can't find anything. Power source is rated for 12v/24v. I register 28.5v on multimeter when everything is turned on. Could this be the cause why the rocker lights don't work? I've switched out rockers twice....same result. Hope u can help. Great video. /bklyn 👑
depends if your needs, more volts more power (for hills, off road trips, big or heavy person) Other wise 48 is good for normal weight and use in a mostly flat and nice roads.
What are the limits to the amount of amps that can be applied to a system. If I want to travel a crazy number of miles like 50 or 60 miles, and I have a 36 volt battery system running a 500 watt motor, can I have a 105 amp -36 volt deep cycle battery feeding into my motor, so I can run for crazy amounts of time or does the controller I'm using limit the number of amps I can feed into it ?. My present set up is a 36 volt - 15 amp system running a 500 watt motor, ecosmart metro razor, but I want to achieve a whole lot greater range then the present 10 to 15 miles I get with the present system. The original set up for that model was a 36 volt - 7 amp system, I have juiced it up a little but I want to achieve 3 times the distance I presently have. Does that mean I triple my amps to 45, and if so, how do I know how much my controller will take.
Theoretically, if you had a 36v 100,000 amp hour system, it would keep going for a very long time, but the monstrous weight would have to be compensated for.
There is an important distinction to make between amps, and amp hours. If you understand that difference, then I can comfortably say, yes. If you don't understand the difference, then we should make that clarification before moving forward.
Actually I'm the guy who has a little knowledge and that's dangerous. To be quite honest I think I do, but then again maybe I don't. Thank you for your reply, I'm a little lost and can only take in so much information at one time. I do know the difference between ac and dc. Which makes me believe that amps for ac is one thing and amp hours for dc are something entirely different. Since I'm working with dc and not ac, I don't know if I need to know the difference, other then one comes from a battery and the other from a wall socket. I promise not to stick anything into a wall socket Ha! Ha! unless it's my battery charger which has a ac plug on it. One is potential and the other is stored energy ? maybe ? best guess. @@BlueMonkeyBicycles
@@ambroseabellair5306 The subject requires a lot of reading, particularly from a reliable source, like batteryuniversity.com I wish I could sum it all up in a comment, or a video, but getting the education from a consistent source is pretty important. Electricity has so many applications, and industries inside of it, that it can be very, very difficult to extract usable information from the endless swarm of keyboard warriors and pseudo professionals (like myself). With that in mind, here's something to get the ball rolling: Amps are a measurement of movement, like measuring how much water comes from a faucet. Amp Hours is a measure of capacity, like measuring how deep a bucket is. Controllers are usually rated for how many amps can run through them at a given time. A 20amp controller can handle 20amps before venturing into untested (usually unsafe) territory. It's common to find controllers rated for a 20amp maximum. Batteries are usually measured in amp hours, meaning how many hours the battery can run before it's expended. This is measured with precise machinery at a pace of a single, solitary amp. A 36V 10Ah battery will run for exactly 10 hours at the rate of 36v and 1amp. If the rate increases, the duration decrease mathematically. That same 36v 10Ah battery will run for exactly 5 hours at a rate of 36v and 2amps. When discussing the many aspects of the bicycle, and its applications, it's important to be precise in the wording. If you're only talking about battery size, and no other topic, I've heard people slack off and use the word "amp" when referring to amp hours. However, this is a shortcut that can be very confusing. Hopefully this sheds some light on the subject.
I have a question about how much to bump up the voltage and amps safely so it doesn’t burn out my motor or any electrical components. Me electric skateboard comes with a factory 48v 4.4 amp lithium battery, which gives me 6-7 miles range. I don’t know the max amp for it. I decided to buy a 48v 8ah and I got 13 miles range(which I’m loving but I’m still having anxiety about it not being enough range and power for steeper hills) Question #1 Can I safely use a 48v (10-12ah) battery for an even longer range? What amp (max amp hr) do you think would be safe to use without damaging the motor and the electric components? Question #2 To manage a occasional steeper hill, I was thinking of using a 60v (ah?) . What do you recommend? I’m able to switch batteries on the go between flat roads (with slight inclines now & then) to making the steeper hills . I would be carry 2 packs of batteries on my ride
1: So long as you can connect it physically, you could have a 48v 1000000000ah battery and it wouldn't effect the motor (other than it would weigh a ton). Although it would run forever, the skateboard's controller will have a stated cap of amps it will draw safely, and your performance will be capped thereby. If you only want extra range, you're aok to swap 48v batteries at will. 2. In order to get more power from the board, you'd need to change the controller. Just to be clear, the controller is a sealed set of electronics within the skateboard, not the device used to control the board that the rider holds. Anyway, you'd need a controller that can handle higher amps running through it. I don't know boards much, you might have a 48v 15amp controller. Might want to find a 48v 20amp to get more guts from it. The hardest part will be finding a controller that is compatible with the connections and input sources (like the controller used by the rider). If your board has a lot of extra features (turn signals, lights, auto brakes on shut off) then it will be even harder to find a controller that can retain them all. You could look for a 60v controller, but you'd want to have an equal or higher cap of amps to make it worthwhile. For example, of you had replaced a 48v 15a (720w) controller with a 60v 10a (600w) controller, you'd be taking a step down in watt output. Just a reminder, the amp hours (ah) measurement is one of capacity, and not addressed in the scenario I just listed. I hope this helps, I kind of rambled a bit.
Thx for the quick response. It was this video you made that made me decide to bump up to 8ah, and it worked. I don’t want to mess with the controller or any other components as I know nothing about it. For my current situation, I don’t really do a lot of steep hills... so longer range is my only concern. I am looking into buying a second battery 48v 14 ah( which would supposedly give me 22 miles) coupled with my current battery (which gives me 13 miles) for a grand total of 35 miles without damaging my board in any way...correct?
As for trying to properly extend the life of the battery pack....at what percentage of the battery should I start recharging? For example, should I recharge only when the battery is drained to 10%? When not in use for a short period of time, at what percentage should I keep it at so that it will retain the charge when I need to use it again?
Nice and informative. Should I only buy branded batteries or would the cheaper unbranded ones be okay? I also found a supplier who's info says the battery pack would be shipped uncharged due to transit laws and to preserve their cell condition. I am not sure if keeping cells in a dead state is good or not?
Thanks for the fast reply and recommendation. Sadly the ebikekit FAQ says they don't ship batteries outside of the USA. The battery pack I need to suit my bike is apparently called a Frog battery and the one I am looking at is rated to have 800 cycle charge life. Does that sound low?
I am located in the Czech Republic at the moment. The Frog battery is a seat stem mount type because my bike has very limited space to mount anything. It looks like this model: eurobikes.com.ua/components/com_jshopping/files/img_products/full_IMG_20161123_123346.jpg Here's an example of the frog battery mounted on a bike stem: www.conhismotor.com/UploadFiles/2014/10/48v_500w_integral_wheel_ebike-1.JPG
Hey great. AliExpress ship to my place via TNT and they have a lot of battery types to choose from. Also they go to great lengths in detailing the manufacturer and process of the batteries being produced. Excellent stuff. You've earned my sub. It's the least I can do.
Too be honest 72volts is more for electric motorbike 750watt motor is plenty of power and since I can pedal a few miles before using the battery for longer distance rides I just want to get to work quicker 30mph to 40mph on a ebike is plenty fast lol I can easily squeak 60km with maybe a higher amp battery but what is the point when the legal limit is more like 15mph but 20mph in the USA is what ile use in the uk to get to work 30mph will be like travelling to Oxford or Grove or didcod could easily get 50 miles out of a 52volt and since you won't be as tired from using the motor I know I can do 5 miles before I get tired and at the end of a long shift at work don't really wanna be pedaling home maybe I should use level 1 asist to go to work and throttle back home that way I get exercise going to work and just cruising should not be turning a pedal bike into a moped anyway I think it's silly to push 40mph on a 750watt but that power will be used when I don't feel like pedaling or want a boost up hills or if the road is quiet and you can just let the throttle out then no doubt but for going to work 20mph is probably the ball park
Is it safe to use a bigger battery for my ebike ? mine uses 48v 21Ah, and the newer models of my bike uses 48v 42Ah, would it damage my Ebike's engine or would it actually improve the range of how many miles i can do ? i live in China and i'm using (Xiao Niu) brand. Thanks in advance
Can i buy a ebay 1200w 14 Ah when my motor, When origningal bike have 500w Boch performance CX that have limit 13,5 Ah Will it work? Good movies thumbs up!
I'm looking at a 48v 14 Ah 1000w front hub direct drive bike, does this seem logical? or is there going to be wasted battery?...also it has no real "pedal assist' the maker claims this is something for the euro market that we don't need here. I told him i want to be able to have an assist when i pedal, he says just pedal while the throttle is on?..does this seem logical?
Thanks for answering back. So you are saying, this person who makes the bikes I'm looking at......should really NOT be pairing the 1000w motor with only 48v and 14 amps.? He charges 300 dollars for the 1000w extra motor, so that has to be the only reason he is doing it, cause I would not get any benefit from a 1000w motor? Wouldn't I be able to go more miles in-between charges with the 1000w? Also, for another math calculation........with the 1000w motor , for the perfect pairing...should 72v with 14 amps. be used? (10008w) or 1000w keeping the 48v but just using a 21amp. battery for (1008w)?? thanks again!!!.........This guy doesn't sell pedal assist so I'm shying away anyway from purchasing from him.
okay, thanks for the explanation. No, I do not want or need 45mph. I was thinking that the 1000w motor would be better for me in my situation. I''m a senior/5'10"/weight around 245lbs, and the larger motor would help in carrying all the weight I'm bringing on to the bike. My girlfriend rides a non-electric bike on tow paths we have around here, and they can go for 15-25 miles I believe in some areas. So I just want the exercise and really love bike riding although I have not done a lot as of late. okay if i decide on this bike, which I do not think I will, cause it has no pedal assist, just throttle, I will NOT pay extra for the 1000w, cause there is no need and will actually decrease my battery faster do to it's extra weight...thanks man for all the info!!!
Great video. Question, my battery is 48v 20ah. My controller is 48v 20ah. Manufacturer upgrade from 20ah b/c none in stock. Will this combo work? Heard it could damage battery. I use PAS too when riding. Hope you can help. /Bklyn👑
Not sure if some one can help me I bought a Ebike 36V with a 6ah battery on a supposed 250w motor. Can I use a battery that states 500w? And connect it to my 36v 6ah 250w battery? Also I'm looking at a 36v 10ah battery to connect to the existing 6ah to give me 16ah @36v.....so as long as I can keep it at 36v I can run as many AH as I want correct.
You are awesome. I just sub to you. I was getting confused and I was going to read more later so I could understand what you said in the video but I wasn't looking for a video, I was just going to watch something else and I seen this and you fixed my brain. I feel like caveman that understand electric motor and battery. You explained it really good. I think I was putting to much thought into it. I have to get arid of my vehicle cause insurance went up and I can have a better quality of life without giving almost 70 percent of my income to the insurance company. I have no points on my license but I guess that's life. I have been wanting a motor bike of some kind for a long time and I guess this is my chance. If insurance comes back down and I drive again, my e bike can be a 2nd form of transportation. That's the way I look at it cause I like to depend on myself. I will check out your other videos but I thank you for this video.
Welcome to the club, i'm fixing my license, so i'm not driving and loving ebikes healthy and cheaper, and faster than just use the bus..... After I get my license will keep using my ebikes as more as I can.
So I have a 52volt 20 amp and it’s on a single speed 29er and I want more rang can I just add amp to the battery. Or more sells.note that I am powering up a 1500 watt motor.
A 48v 13 ah battery could also be described as a 624 watt hour battery (48 x 13 = 624). A 48v 17ah battery would come to 816wh. Generally, bigger is better, but if you're not going to utilize that much energy, then you might be spending more than you need. I've seen 816wh batteries take an empty cargo bike for 55 miles on a single charge at 25mph, as a point of reference.
I see, impressive. Is that 55 miles at 25mph with or without pedaling ? Here's the bike i'm thinking of buying, it's 1500 euro or about 1700 dollars ruclips.net/video/uD6S5ILHcUE/видео.html It's getting a lot of really good reviews !
I honestly don't know if that video you showed me was a joke. At one point it claimed the entire bike was small enough to fit in a backpack. I would not buy this product for myself, or recommend it to anyone I know. To me it reminds me of other bikes I've seen that are cheap junk that are marked up for a cash grab company to make a quick buck before leaving the customers high and dry with busted bikes. Try calling the company that makes it, or sells it. If you can't get a hold of them; it's a terrible sign.
Ok, that video was a little bit sketchy... try this link instead. www.aliexpress.com/item/RichBit-RT-012-Plus-Fat-Tire-ebike-21-speeds-48V-1000W-17Ah-Lithium-Battery-powerful-Electric/32822462894.html?ws_ab_test=searchweb0_0,searchweb201602_4_10152_10151_10065_10344_10068_10342_5722912_10343_10340_5722612_10341_10696_5722812_10084_10083_10618_5722712_10304_10307_10820_10821_10302_10059_100031_10103_10624_10623_10622_10621_10620_5722512,searchweb201603_19,ppcSwitch_3_ppcChannel&algo_expid=b92f262c-8152-4e1e-b850-e21035282d6e-1&algo_pvid=b92f262c-8152-4e1e-b850-e21035282d6e&priceBeautifyAB=0
For that much money you may as well get a surface604. They actually answer their phone, and they love electric bikes. With a Chinese bike there is almost no recourse if something goes wrong. Who will you contact for parts? Who can guide you in putting it together? Even the best brand name bikes can have issues out of the box, and the cheaper you get the more likely that is.
All DC permanent magnet motors have a "motor constant". This constant can be expressed in terms of RPM/Volt or in terms of Foot-Pounds/Amp. The interesting thing is that given either one the other can be computed. www.prc68.com/I/TestingDCMotors.html#TstUnkMtr So the torque a motor can generate depends on how much current it gets and how fast it turns depends on the voltage it gets. Power is the product of torque and RPM. My eTrike has a 48 Volt battery rated at 14.5 Amp-hours, or multiplying 696 Watt-hours. The motor is rated 750 watts, so dividing 696 Wh/750W = 0.928 hours or 56 minutes at full power. www.prc68.com/I/AddmotorM360Trike.shtml#Battery_MC
Hey great videos dude! Hey I was thinking about getting a 750w bafan geared hub for my mongoose malus bike. It has 2 battery options 48v 17.5ah or 52v14ah wich one you think better? I would like the extra power of 52v but you said if lower ah less power?
Lower amp hours would yield lower range, typically. For me, at around 190lbs and planning on pedaling with it, I would go with the 48v pack done it is overall larger capacity, and plenty of power for my needs. If you carry extra loads, or have especially common or steep hold, then you might like the 52v better.
Blue Monkey Bicycles if I have a battery pack of 14.8Volt&52OOmah then how many pack I need to joint together to have an 72v&15or2Oah please help me out!..
Utah! Slowly I turn, step by step...well if nothing else’s sure is clean up there. It’s like every night they scrub the state down, Still no booze on Sunday. Good video refresher’s always good.
It really depends on what you're making. If you want a long lasting, reliable work horse, then you may want to restrain it a little. If you want an unpredictable wild stallion, then jump on it and ride for your life.
No! The reason for using higher voltages is to reduce the IxR losses due to resistance thus voltage drop of the wires providing power not only to the motor but also in the motor its self. If you used a 6 volt motor you would have to have wires as thick as your finger to wire it as in old golf karts. The battery would be the same size just wired for 6 volts.
I also think you could go further if you double the voltage without increasing the amp hours, because less amp is required at higher voltage to provide the same power.
Roger
Jordan
all motors are designed for a specific voltage and voltage drop
For most industrial motors it is usually 10 percent
Motors draw more current when the load (horsepower requirements) increases
as a motor draws more current (Amps) the voltage drops
if the wires are large enough and the voltage is high enough and the load light enough than the drop is minimal
but if they are not than the motor voltage will be below design limits . . .
so a 6V motor cannot produce max power below 5.4V
but a 48V motor is still able to operate at 43.2V and requires 1/8 the current of the 6V motor to produce the same amount of horsepower (Watts)
how about dc to ac convertor to ac generator back to dc brushless motor? hehe + or - WATTS?
Volts = size of the engine
Amp hrs = fuel in the tank
I would say Volts is like an elevated water tank that keeps magically comes down with usage to finally have no pressure, and amp hours is the hose that connects the tank to the garden. Wider the hose, more water. Taller the tank is, more water comes out for the same hose.
Thanks for getting more confused!
@@joego7924 😂😂😂😂😂👍👍👍
Theres more to this than that, but this sums it up.
not really... Watt Hours (or Volt * Amp hrs) = fuel in the tank! In other words: the combination of Volts and (*) Amps will bring you forward (=) Watts. The capacity of a battery is measured in Watts per Hour Wh. So two same size batteries with 36V and 48V with same battery cells have the same capacity (Watt Hours, Volts * Ampere Hours) that means they do have the same driving range even with different Volts and Amp Hours. Same energy density but different volt/amp ratio. So if you drive on higher voltage with same speed then the motor typically needs less amps. This means you use about the same Watts (Volt * Amps). So higher battery voltage has typically higher MAX power but can be as efficient as a lower voltage battery if just drive as slow. Hope that clarifies.
You could design a 36V system that would perform exactly the same as a 48 V system, but to achieve the same power, the 36V system will probably require thicker wires to accomodate the extra current. Higher voltage is usually prefered to increase efficiency and lower cost. Watts and Wh are what matters in the end.
Keven Harvey true
Thats what i dont like about this video
Another thing that needs to be mentioned here is that a battery with Higher Amp-hours will likely have less voltage drop under load than a battery that has less amp-hours as it would have less internal resistance especially as more cells are put in parallel or even the quality of the cells, so you can have less energy being wasted in the battery due to internal heating
250W Motor used
Say a 5AH 24V Battery has 28 Volts no load
25.1 Volts under load when riding
So the motor still needs roughly 250 Watts of power:
25.1 Volts from the battery under load and 250 Watts of power demand under load means 9.9 Amps
So 9.9 Amps X 25.1 Volts is 250 Watts.
Compared to a 10AH 24V Battery that has less internal resistance and can comfortably output more current thus causing less of a voltage drop:
Say the drop becomes 27.1 Volts since the 10 AH Pack has the resistance reduced multiple times from having more cells.
250 Watts are still needed to run this motor continuously.
250 Watts Divided By 27.1 Volts from under load would be 9.22 Amps.
This would mean that you now have a motor that can do more work since it has slightly more voltage under load, thus meaning better hill climbing capabilities, and higher average speeds.
On top of that, your motor controller isnt having to pull as much current, to do more work than before. To simply this as low as possible, this is just Ohm's Law. So, if you cannot upgrade voltage, here's another reason to upgrade amp-hours to get a little more out of your electronics.
I can make a better decision because of this info. thank you
Thanks, this is the first video that actually made this make sense to me. Trying to build my first battery for a motor I think is appropriate. I'm a whiz with mechanical contraptions, but I have some difficulty crossing into motorizing, providing power and having enough. Trying 10, 5500mAH, 3.7 volt batterings that can discharge at 18amps, with a motor that is 36v motor that draws 17amp at 36v. (says max power 733). I'm just now learning this, but I figured the motor could run for 2.94hours at that speed?
Running batteries at high discharge currents greatly reduces their capacity as they are all tested with a 1amp discharge to get their mAh rating
Depends on RPM motor.
its basically what he said but can be misleading also remeber your motor ONLY draws the amps it needs, as long an the voltage is the same
This is really not the case since doubling the volt which cuts your mAh in half also cuts the Amp you will be using for the same wattage you would use for your motor. But by increasing the volt you will be able to increase the max watt that you will be able to output if you have an amp limit such as heat from wires, etc.
With a 72V 5Ah setup using the same watt usage as a 36V 5Ah you would be able to run twice as long.
Yes I know and that's great it's just that I don't want anyone to give out the impression that Volt vs Amp hours is power vs fuel, which it isn't, the fuel is Watt hours.
Cause that's the logic I first used when I started out which lead to one of my projects to overheat cause I wanted the maximum amount of Ah xD
I have a 2021 Pride Pursuit XL with 2 12 volt 75 ah batteries I added 2 more batteries the same on my trailer at the back so I have 24 volts 75 ah all together now I would like to get more miles about 60 miles if I can. what do need .thank you
Hi How can we Improve a 36v 10.4 amp ebike in range What would we have to change Thank you.
What would be better? A 52v 13.5ah or a 48v 17.5ah?
For speed 52V. For range 17.5ah
Hi im confused even after watching your video. my bike claims it has 72v/45ah They didnt explain that the power comes from 6 batteries so I dont know each batteries' individual specification. now my question is do I need to pick up 6 x 12v 45ah ? Dude ill be sweating waiting for your answer lol its like $130 a battery here in canada jesus.
What bike do you have?
@@BlueMonkeyBicycles emmo zone gts. I got it from emmo for around $3300
Are you asking about buying a replacement battery?
i have 36v 14ah 250 watts e bike, can i use 36v 40ah battery ,is there any problem motor or controller volts are same ah only increased please inform me
That would work just fine
Can I use a 36v sistem with a 14 or 20 amp?I ask because I buy a ebike but the battery is 36v 8amp and I want more, so I want to know if I can use the same system for a bigger battery, with more amp, thanks
yes, you'll have more range.
I like the out-takes.
Ok video. You miss the mark on capacity and speed. You said a 48v 15Ah battery will go faster than a 48v 10Ah battery. While generally it is true that larger batteries can usually supply higher current than a smaller one, this is not always true. It is certainly not true for an e-bike who uses a current-limiting controller. (that's like all of them)
In fact, if you increase the size of the battery with another same-type battery while remaining at the same voltage, you will not go faster or slower in top speed but you will certainly lose acceleration because the bigger battery will invariably be heavier.
Your motor controller sends a max current to the motor at whatever voltage you are using, ergo a 48v 15Ah battery will not propel your bike faster than a 48v 10Ah battery assuming the smaller battery can actually supply the max current capacity of the controller. The only way to go faster is actually increasing the voltage. (because the current will still remain at whatever max the controller is rated at)
Motors are rated at X number of RPM per volt input, not by current input. Allowing more current to the motor will make it accelerate faster but will not make it spin faster. Only more volts can make it spin faster. Controller 1 is rated at 20A and controller 2 is rated at 30A. You run the same 48v battery on each. Controller 2 will allow the bike to accelerate faster to its top speed but both controllers will propel the bike to the same top speed. This is only true for relatively low speeds (in the legal range for e-bikes) as beyond that the increases in aerodynamic drag become a factor and at some point the higher rated controller will allow for a higher top speed as it it supplying more power to the motor.
I can't make short videos with scripts this long
Thanks for the video!! Subscribed!!
I build a 2000w 48v Fat tire mini bike ,
me on that weight approx 400 pounds and I order
a 48v 20Mh 50Amp .
Do you think that will have enough tork ?
I am going to buy a ebike but one is 48v 10.4ah while another is 36v 12.5 ah .
Can u tell me whats the difference ?
which one is better in range ?
which one can go uphill better?
Both have 800W motor as i know .
The 48v is sight larger in total capacity, but the battery size alone won't tell us enough to determine hill climbing or range.
For example, I have personally rode a bike with a 36v 11.6ah and a 350w motor that was much better in hill climbing and range over a weak bike with a 48v 14ah battery and a 500w motor.
Would a 40Ah battery give you twice the range of a 20Ah battery? Great video, thank you!
Were you not watching.Answer clearly explained
It could. a more accurate way to measure the range on a battery would be watt hours not ah
@@betopelotaz1 really, why ? pretty much same thing no ?
@@brogen100 ah is a standard estimate watt hours is an exact capacity of the battery
@@betopelotaz1 yup, have been reading up on it, and it makes sense now. thank you !
Ziyoujiguang T18 what would be a great controller for 250w hub motor, People say this 250w motor is secretly 350 i dont know hate to burn it up ,What to do to make it faster 36v to a 46v battery 14ah it has 36v 6ah on board does 15mph need about 25mph please help.
Great video.
Question...I'm new (self taught) to electrical engineering, repair + maintenance of ebikes.
I installed a 4-light system on ebike - backlight, high beam (×1) and low beam (×2). I run everything through a 12v/24v power source (bank).
Recently, I decided to add rocker switch (×2) to separate high be from low beam. I noticed that the LED indicators on the rockers will sometimes work, sometimes not but the lights will always work. I've looked for shorts, can't find anything.
Power source is rated for 12v/24v. I register 28.5v on multimeter when everything is turned on. Could this be the cause why the rocker lights don't work? I've switched out rockers twice....same result.
Hope u can help. Great video.
/bklyn 👑
Seen a 72volt 30amp battery and a 45volt 40amp battery. Not sure which is better.
depends if your needs, more volts more power (for hills, off road trips, big or heavy person) Other wise 48 is good for normal weight and use in a mostly flat and nice roads.
What are the limits to the amount of amps that can be applied to a system. If I want to travel a crazy number of miles like 50 or 60 miles, and I have a 36 volt battery system running a 500 watt motor, can I have a 105 amp -36 volt deep cycle battery feeding into my motor, so I can run for crazy amounts of time or does the controller I'm using limit the number of amps I can feed into it ?.
My present set up is a 36 volt - 15 amp system running a 500 watt motor, ecosmart metro razor, but I want to achieve a whole lot greater range then the present 10 to 15 miles I get with the present system. The original set up for that model was a 36 volt - 7 amp system, I have juiced it up a little but I want to achieve 3 times the distance I presently have. Does that mean I triple my amps to 45, and if so, how do I know how much my controller will take.
Theoretically, if you had a 36v 100,000 amp hour system, it would keep going for a very long time, but the monstrous weight would have to be compensated for.
There is an important distinction to make between amps, and amp hours. If you understand that difference, then I can comfortably say, yes. If you don't understand the difference, then we should make that clarification before moving forward.
Actually I'm the guy who has a little knowledge and that's dangerous. To be quite honest I think I do, but then again maybe I don't.
Thank you for your reply, I'm a little lost and can only take in so much information at one time. I do know the difference between ac and dc.
Which makes me believe that amps for ac is one thing and amp hours for dc are something entirely different.
Since I'm working with dc and not ac, I don't know if I need to know the difference, other then one comes from a battery and the other from a wall socket.
I promise not to stick anything into a wall socket Ha! Ha! unless it's my battery charger which has a ac plug on it. One is potential and the other is stored energy ? maybe ? best guess. @@BlueMonkeyBicycles
@@ambroseabellair5306
The subject requires a lot of reading, particularly from a reliable source, like batteryuniversity.com I wish I could sum it all up in a comment, or a video, but getting the education from a consistent source is pretty important. Electricity has so many applications, and industries inside of it, that it can be very, very difficult to extract usable information from the endless swarm of keyboard warriors and pseudo professionals (like myself).
With that in mind, here's something to get the ball rolling: Amps are a measurement of movement, like measuring how much water comes from a faucet. Amp Hours is a measure of capacity, like measuring how deep a bucket is.
Controllers are usually rated for how many amps can run through them at a given time. A 20amp controller can handle 20amps before venturing into untested (usually unsafe) territory. It's common to find controllers rated for a 20amp maximum.
Batteries are usually measured in amp hours, meaning how many hours the battery can run before it's expended. This is measured with precise machinery at a pace of a single, solitary amp. A 36V 10Ah battery will run for exactly 10 hours at the rate of 36v and 1amp. If the rate increases, the duration decrease mathematically. That same 36v 10Ah battery will run for exactly 5 hours at a rate of 36v and 2amps.
When discussing the many aspects of the bicycle, and its applications, it's important to be precise in the wording. If you're only talking about battery size, and no other topic, I've heard people slack off and use the word "amp" when referring to amp hours. However, this is a shortcut that can be very confusing. Hopefully this sheds some light on the subject.
is the number of amps what matter when it comes to power? how many amps the battery can put out
Volts means power...
amps means range=miles
I have a question about how much to bump up the voltage and amps safely so it doesn’t burn out my motor or any electrical components.
Me electric skateboard comes with a factory 48v 4.4 amp lithium battery, which gives me 6-7 miles range. I don’t know the max amp for it.
I decided to buy a 48v 8ah and I got 13 miles range(which I’m loving but I’m still having anxiety about it not being enough range and power for steeper hills)
Question #1
Can I safely use a 48v (10-12ah) battery for an even longer range? What amp (max amp hr) do you think would be safe to use without damaging the motor and the electric components?
Question #2
To manage a occasional steeper hill, I was thinking of using a 60v (ah?) . What do you recommend?
I’m able to switch batteries on the go between flat roads (with slight inclines now & then) to making the steeper hills . I would be carry 2 packs of batteries on my ride
1: So long as you can connect it physically, you could have a 48v 1000000000ah battery and it wouldn't effect the motor (other than it would weigh a ton). Although it would run forever, the skateboard's controller will have a stated cap of amps it will draw safely, and your performance will be capped thereby. If you only want extra range, you're aok to swap 48v batteries at will.
2. In order to get more power from the board, you'd need to change the controller. Just to be clear, the controller is a sealed set of electronics within the skateboard, not the device used to control the board that the rider holds. Anyway, you'd need a controller that can handle higher amps running through it. I don't know boards much, you might have a 48v 15amp controller. Might want to find a 48v 20amp to get more guts from it. The hardest part will be finding a controller that is compatible with the connections and input sources (like the controller used by the rider). If your board has a lot of extra features (turn signals, lights, auto brakes on shut off) then it will be even harder to find a controller that can retain them all. You could look for a 60v controller, but you'd want to have an equal or higher cap of amps to make it worthwhile. For example, of you had replaced a 48v 15a (720w) controller with a 60v 10a (600w) controller, you'd be taking a step down in watt output. Just a reminder, the amp hours (ah) measurement is one of capacity, and not addressed in the scenario I just listed. I hope this helps, I kind of rambled a bit.
Thx for the quick response. It was this video you made that made me decide to bump up to 8ah, and it worked.
I don’t want to mess with the controller or any other components as I know nothing about it.
For my current situation, I don’t really do a lot of steep hills... so longer range is my only concern.
I am looking into buying a second battery 48v 14 ah( which would supposedly give me 22 miles) coupled with my current battery (which gives me 13 miles) for a grand total of 35 miles without damaging my board in any way...correct?
As for trying to properly extend the life of the battery pack....at what percentage of the battery should I start recharging? For example, should I recharge only when the battery is drained to 10%?
When not in use for a short period of time, at what percentage should I keep it at so that it will retain the charge when I need to use it again?
Nice and informative. Should I only buy branded batteries or would the cheaper unbranded ones be okay? I also found a supplier who's info says the battery pack would be shipped uncharged due to transit laws and to preserve their cell condition. I am not sure if keeping cells in a dead state is good or not?
Thanks for the fast reply and recommendation. Sadly the ebikekit FAQ says they don't ship batteries outside of the USA. The battery pack I need to suit my bike is apparently called a Frog battery and the one I am looking at is rated to have 800 cycle charge life. Does that sound low?
I am located in the Czech Republic at the moment. The Frog battery is a seat stem mount type because my bike has very limited space to mount anything. It looks like this model: eurobikes.com.ua/components/com_jshopping/files/img_products/full_IMG_20161123_123346.jpg
Here's an example of the frog battery mounted on a bike stem:
www.conhismotor.com/UploadFiles/2014/10/48v_500w_integral_wheel_ebike-1.JPG
Hey great. AliExpress ship to my place via TNT and they have a lot of battery types to choose from. Also they go to great lengths in detailing the manufacturer and process of the batteries being produced. Excellent stuff. You've earned my sub. It's the least I can do.
Hey I would be happy to leave a positive review but that link takes me to Sonys Japanese website. Is it a good link?
Link never directed me to PornHub. 1 star. Never again.
Heee hee, just kidding. Positive review just dropped. Thank you again.
if i have any question then where to ask u?
I recommend 72 volt 20 ah battrey
Too be honest 72volts is more for electric motorbike 750watt motor is plenty of power and since I can pedal a few miles before using the battery for longer distance rides I just want to get to work quicker 30mph to 40mph on a ebike is plenty fast lol I can easily squeak 60km with maybe a higher amp battery but what is the point when the legal limit is more like 15mph but 20mph in the USA is what ile use in the uk to get to work 30mph will be like travelling to Oxford or Grove or didcod could easily get 50 miles out of a 52volt and since you won't be as tired from using the motor I know I can do 5 miles before I get tired and at the end of a long shift at work don't really wanna be pedaling home maybe I should use level 1 asist to go to work and throttle back home that way I get exercise going to work and just cruising should not be turning a pedal bike into a moped anyway I think it's silly to push 40mph on a 750watt but that power will be used when I don't feel like pedaling or want a boost up hills or if the road is quiet and you can just let the throttle out then no doubt but for going to work 20mph is probably the ball park
Is it safe to use a bigger battery for my ebike ? mine uses 48v 21Ah, and the newer models of my bike uses 48v 42Ah, would it damage my Ebike's engine or would it actually improve the range of how many miles i can do ? i live in China and i'm using (Xiao Niu) brand. Thanks in advance
It'll be fine
Can i buy a ebay 1200w 14 Ah when my motor, When origningal bike have 500w Boch performance CX that have limit 13,5 Ah Will it work? Good movies thumbs up!
Upgrading a Bosch system with other hardware isn't recommended. You'd be best to start of from scratch
I'm looking at a 48v 14 Ah 1000w front hub direct drive bike, does this seem logical? or is there going to be wasted battery?...also it has no real "pedal assist' the maker claims this is something for the euro market that we don't need here. I told him i want to be able to have an assist when i pedal, he says just pedal while the throttle is on?..does this seem logical?
Thanks for answering back. So you are saying, this person who makes the bikes I'm looking at......should really NOT be pairing the 1000w motor with only 48v and 14 amps.? He charges 300 dollars for the 1000w extra motor, so that has to be the only reason he is doing it, cause I would not get any benefit from a 1000w motor? Wouldn't I be able to go more miles in-between charges with the 1000w? Also, for another math calculation........with the 1000w motor , for the perfect pairing...should 72v with 14 amps. be used? (10008w) or 1000w keeping the 48v but just using a 21amp. battery for (1008w)?? thanks again!!!.........This guy doesn't sell pedal assist so I'm shying away anyway from purchasing from him.
okay, thanks for the explanation. No, I do not want or need 45mph. I was thinking that the 1000w motor would be better for me in my situation. I''m a senior/5'10"/weight around 245lbs, and the larger motor would help in carrying all the weight I'm bringing on to the bike. My girlfriend rides a non-electric bike on tow paths we have around here, and they can go for 15-25 miles I believe in some areas. So I just want the exercise and really love bike riding although I have not done a lot as of late. okay if i decide on this bike, which I do not think I will, cause it has no pedal assist, just throttle, I will NOT pay extra for the 1000w, cause there is no need and will actually decrease my battery faster do to it's extra weight...thanks man for all the info!!!
Great video.
Question, my battery is 48v 20ah. My controller is 48v 20ah. Manufacturer upgrade from 20ah b/c none in stock.
Will this combo work? Heard it could damage battery. I use PAS too when riding.
Hope you can help.
/Bklyn👑
Normally, controllers are rated for voltage and amps (48v 10a).
I'm not sure I understand the conundrum
Not sure if some one can help me I bought a Ebike 36V with a 6ah battery on a supposed 250w motor. Can I use a battery that states 500w? And connect it to my 36v 6ah 250w battery?
Also I'm looking at a 36v 10ah battery to connect to the existing 6ah to give me 16ah @36v.....so as long as I can keep it at 36v I can run as many AH as I want correct.
Yes, do long as you're set for 36v, you can run as many any hours as you'd like.
You are awesome. I just sub to you. I was getting confused and I was going to read more later so I could understand what you said in the video but I wasn't looking for a video, I was just going to watch something else and I seen this and you fixed my brain. I feel like caveman that understand electric motor and battery. You explained it really good. I think I was putting to much thought into it. I have to get arid of my vehicle cause insurance went up and I can have a better quality of life without giving almost 70 percent of my income to the insurance company. I have no points on my license but I guess that's life. I have been wanting a motor bike of some kind for a long time and I guess this is my chance. If insurance comes back down and I drive again, my e bike can be a 2nd form of transportation. That's the way I look at it cause I like to depend on myself. I will check out your other videos but I thank you for this video.
Welcome to the club, i'm fixing my license, so i'm not driving and loving ebikes healthy and cheaper, and faster than just use the bus.....
After I get my license will keep using my ebikes as more as I can.
So I have a 52volt 20 amp and it’s on a single speed 29er and I want more rang can I just add amp to the battery. Or more sells.note that I am powering up a 1500 watt motor.
And I am powering up a 1500 watt motor
@@richardwallace8666 just add more amps
Volts x amps x watts = total confusion . I don’t understand any of this stuff.
Dude !!! You haven't mentioned the motor capacity ! I mean all this REALLY means nothing without a given elctric motor wattage
I have a different video covering that topic.
i have 48volt 30 ah battery in my ev, can i use 48v40ah or 48v50ah battery in my ev. 250watt hub moter hv my ev.
Yes, you can use any 48v battery if it physically fits.
You should upgrade to at least 500 watt motor
Is a 48v 17ah 1000 watt battery much better than a 48v 13ah 1000 watt battery ?
A 48v 13 ah battery could also be described as a 624 watt hour battery (48 x 13 = 624). A 48v 17ah battery would come to 816wh.
Generally, bigger is better, but if you're not going to utilize that much energy, then you might be spending more than you need. I've seen 816wh batteries take an empty cargo bike for 55 miles on a single charge at 25mph, as a point of reference.
I see, impressive. Is that 55 miles at 25mph with or without pedaling ?
Here's the bike i'm thinking of buying, it's 1500 euro or about 1700 dollars ruclips.net/video/uD6S5ILHcUE/видео.html
It's getting a lot of really good reviews !
I honestly don't know if that video you showed me was a joke. At one point it claimed the entire bike was small enough to fit in a backpack.
I would not buy this product for myself, or recommend it to anyone I know.
To me it reminds me of other bikes I've seen that are cheap junk that are marked up for a cash grab company to make a quick buck before leaving the customers high and dry with busted bikes. Try calling the company that makes it, or sells it. If you can't get a hold of them; it's a terrible sign.
Ok, that video was a little bit sketchy... try this link instead.
www.aliexpress.com/item/RichBit-RT-012-Plus-Fat-Tire-ebike-21-speeds-48V-1000W-17Ah-Lithium-Battery-powerful-Electric/32822462894.html?ws_ab_test=searchweb0_0,searchweb201602_4_10152_10151_10065_10344_10068_10342_5722912_10343_10340_5722612_10341_10696_5722812_10084_10083_10618_5722712_10304_10307_10820_10821_10302_10059_100031_10103_10624_10623_10622_10621_10620_5722512,searchweb201603_19,ppcSwitch_3_ppcChannel&algo_expid=b92f262c-8152-4e1e-b850-e21035282d6e-1&algo_pvid=b92f262c-8152-4e1e-b850-e21035282d6e&priceBeautifyAB=0
For that much money you may as well get a surface604. They actually answer their phone, and they love electric bikes. With a Chinese bike there is almost no recourse if something goes wrong. Who will you contact for parts? Who can guide you in putting it together? Even the best brand name bikes can have issues out of the box, and the cheaper you get the more likely that is.
All DC permanent magnet motors have a "motor constant". This constant can be expressed in terms of RPM/Volt or in terms of Foot-Pounds/Amp. The interesting thing is that given either one the other can be computed. www.prc68.com/I/TestingDCMotors.html#TstUnkMtr So the torque a motor can generate depends on how much current it gets and how fast it turns depends on the voltage it gets. Power is the product of torque and RPM.
My eTrike has a 48 Volt battery rated at 14.5 Amp-hours, or multiplying 696 Watt-hours.
The motor is rated 750 watts, so dividing 696 Wh/750W = 0.928 hours or 56 minutes at full power. www.prc68.com/I/AddmotorM360Trike.shtml#Battery_MC
Hey great videos dude! Hey I was thinking about getting a 750w bafan geared hub for my mongoose malus bike. It has 2 battery options 48v 17.5ah or 52v14ah wich one you think better? I would like the extra power of 52v but you said if lower ah less power?
Lower amp hours would yield lower range, typically.
For me, at around 190lbs and planning on pedaling with it, I would go with the 48v pack done it is overall larger capacity, and plenty of power for my needs.
If you carry extra loads, or have especially common or steep hold, then you might like the 52v better.
@@BlueMonkeyBicycles ah cool ok bro thanks!!
Did you just write "Vots" * Amps? Must've been an oversight.
Bingo!
How much ah does and 1OOOWATT MOTOR consume Per hours???
Blue Monkey Bicycles thankyou brother love watching ur knowledge stuff's
Blue Monkey Bicycles if I have a battery pack of 14.8Volt&52OOmah then how many pack I need to joint together to have an 72v&15or2Oah please help me out!..
@@amittiwari7806 depends if you join them in series or parallel...
Utah! Slowly I turn, step by step...well if nothing else’s sure is clean up there. It’s like every night they scrub the state down, Still no booze on Sunday. Good video refresher’s always good.
Very good video, great explanation
I've got 52v battery fully charged with 16000ah with 1000w wheel and controller with 35anps
Sounds fun
@@BlueMonkeyBicycles thanks for the reply some one told me the more amps on your controller the better is that true still learning
It really depends on what you're making. If you want a long lasting, reliable work horse, then you may want to restrain it a little. If you want an unpredictable wild stallion, then jump on it and ride for your life.
Nick Walters 16000ah battery? Does it fit in your garage?
@@DidacticEditions no I sold it lol now on 72v 20amh
My Problem solved but too late i have already bought a 48v 13àh battery. All the same thanks for the lecture 😎😎
Please turn down the music when you're speaking my friend
LOL nice SF3 3rd strike music
I touch every where , it doesn't work 🤔😁
Consult a physician
@@BlueMonkeyBicycles I also really wanted to see the range test but it not working :(
cool it with the music . so distracting
.