I’m a little worried that your batteries aren’t what you think they are. If they really are AA sized, which is rare in the lithium battery world, then they are not 3,000 mAh. Next, 10 cells in series is going to give you 36V, which is twice what your 18V drill is rated for. 5 cells in series and 2 in parallel would be a better method. I usually recommend a BMS but you can skip it if you have another way of diligently monitoring your cell voltages and then charging using an RC style balance charger like an iMaxB6 charger through an JST-XH connector.
Hello Court! I have spent a good deal of time the past few months researching e-bikes. I read your introductory book and nearly every online review you have written over the last year or so. The closest e-bike shops to me are about a two hour drive and are limited in what brands and models they stock (mainly city style bikes). So before I venture out to test drive a few models, I am seeking your advice to narrow down the type of bike and drive train that makes the most sense for my application.
Some e-bikes have an electric motor that operates on a power-on-demand basis only. In this case, the electric motor is engaged and operated manually using a throttle, which is usually on the handgrip just like the ones on a motorbike or scooter. These sorts of e-bikes often, but not always, have more powerful motors than pedelecs do.
There are now people building after-market kits based on the GNG kit, but upgrading the primary reduction belt from 15mm to 25mm, also the new 25mm belt is USA made. Search for “Lightning Rods Mid Drive” if you are curious.
Duke Eco-Marathon Team using an Electric Bike Technologies hub motor for the 2014 Shell Eco-marathon. The E-BikeKit motor provides optimal space saving because it does not require a chain (this makes it great for converting road bicycles to electric bicycles, which is what it is designed to do) but we hope to determine if it provides us with a better overall vehicle efficiency than our outboard motor.
I then took my second sense wire (or your third sense wire if you have one more sense wires than parallel groups) and soldered it to the positive terminal of the second parallel group. Again, note that I’m soldering this wire to the nickel in between cells to avoid heating any cell directly.
One of the most affordable Haibikes in the line, available in four frame sizes, relatively lightweight, large 29er tires provide float and momentum at speed for cross country riding. Very capable mid-drive system (the same motor and battery as some higher-priced Haibike models), zero……
The Bosch Performance Line motor is an electric bike drive systems that offers a balanced mix of performance, range and reliability. The design of the Performance Line system allows the motor to give you peak torque in each of your gears, making for great hill climbing ability with low power usage.
10. Limitation of Liability: By entering you agree to release and hold harmless Electric Bike Technologies LLC and its subsidiaries, affiliates, advertising and promotion agencies, partners, representatives, agents, successors, assigns, employees, officers and directors from any liability, illness, injury, death, loss, litigation, claim or damage that may occur, directly or indirectly, whether caused by negligence or not, from (i) such entrant’s participation in the sweepstakes and/or his/her acceptance, possession, use, or misuse of any prize or any portion thereof, (ii) technical failures of any kind, including but not limited to the malfunctioning of any computer, cable, network, hardware or software; (iii) the unavailability or inaccessibility of any transmissions or telephone or Internet service; (iv) unauthorized human intervention in any part of the entry process or the Promotion; (v) electronic or human error which may occur in the administration of the Promotion or the processing of entries.
3. There’s something that I think you might be missing here. The factor that actually limits current draw is the controller, not the motor or the BMS. Those are “rated” for 500w and 15A, respectively, meaning they won’t overheat at those values. But both can physically pass those values if you force them to. It’s the controller that is actually “pulling” the current. So you should check your controller to see what its current limit is. If it is a 15A limit controller, then it won’t physically pull more than 15A. The fact that your battery can technically put out 1200W just means that it has “oomph” than you’re using, and you’re giving it an easy, healthy life. But if you switched to a 50A controller, suddenly you’d be pulling the maximum current that your battery can supply (and probably overheating your motor if you pull that 50A for a long time).
Test the voltage of each cell to make sure that they are all identical. If your cells came straight from the factory, they shouldn’t vary by more than a few percentage points from one to the next. They will likely fall in the range of 3.6-3.8 volts per cell as most factories ship their cells partially discharged to extend their shelf lives.
your post have been extremely infomative, i am trying to DIY a pack for my electric scooter for a 36V and around 5AH pack should it be 10S 2P? sorry if i am not clear, kinda a beginner myself. and BMS wise what kind should i use?
Yes, that’d work, but I’d get an additional 7s battery so you have 20s total. Also, you should know that the older your original 48V battery is, the more time it will take your new 72V combined battery to balance, as the first 13 cells will likely have less capacity in comparison to the newer cells. I made a video recently showing how to do this upgrade that you’re talking about: https://www.youtube.com/watch?v=9KHo-T74IWA
Hi Court, I discovered your site and it’s great. I’m 6’8″ tall, 274 lbs., and batteries for electric scooters replacement years old and still biking but needing some help and assistance on long hills of pavement or crushed rock. Wouldn’t mind having a few coasting breaks too. And the step through appeal to me as I get older. Looking at ebikes and especially the Pedego step through Interceptor with magnesium wheels for weight carrying capacity. What do you think? Good choice or is there another out there that would fit this old boy?
We do not deliver on Sundays, but do sometimes deliver on Saturday depending on the carrier that is delivering your order. The best way to determine the date of delivery is to check the status in My Account .
9. Terms: Electric Bike Technologies LLC reserves the right, in its sole discretion to cancel, terminate, modify or suspend the Sweepstakes should (in its sole discretion) a virus, bugs, non-authorized human intervention, fraud or other causes beyond its control corrupt or affect the administration, security, fairness or proper conduct of the Sweepstakes. In such case, Electric Bike Technologies LLC may select the recipients from all eligible entries received prior to and/or after (if appropriate) the action taken by Electric Bike Technologies LLC. Electric Bike Technologies LLC reserves the right at its sole discretion to disqualify any individual who tampers or attempts to tamper with the entry process or the operation of the Sweepstakes or website or violates these Terms & Conditions.
Various designs (including those mentioned above) are designed to fit inside most area laws, and the ones that contain pedals can be used on roads in the United Kingdom, among other countries.
GNG now has a different version of the mid drive where the belt reduction (prone to failure) has been replaced by a gear drive at the end of the motor. Has anyone tried it? You can’t argue with the price, but what’s the quality and longevity?
E-bikes are classed according to the power that their electric motor can deliver and the control system, i.e., when and how the power from the motor is applied. Also the classification of e-bikes is complicated as much of the definition is due to legal reasons of what constitutes a bicycle and what constitutes a moped or motorcycle. As such, the classification of these e-bikes varies greatly across countries and local jurisdictions.