Oh, one last thing. If you have a poorly formed connector or the wires are fraying, that can increase resistance and cause a voltage drop that might trip a cutoff condition. Just another thing to check for.
When it comes to choosing a BMS, the number of cells you have in parallel aren’t important. Only the number of series cells matters. The same BMS will work with 1 or 100 cells in parallel, as the voltage stays the batteries for electric scooters canada regardless of the number of parallel cells.
To develop a new hub motor would cost over $500,000 in tooling costs for a factory in China. Thats why even though there are many hub motors around for E-bikes, most are the same types or clones of existing types. Here is a list of known acceptable qualty hub motors available as of March 2012.
I need your input on a trike conversion. I’m disabled, and working on converting a trike I got on the cheap to electric powered. I’m unable to petal, and handcycles are sooo out of budget it isn’t funny. I have a Trailmail Joyrider Junior. (i’m rather short so it’s a good size for me. The way it’s designed I can do a chain drive, mid drive or a hub (since I’m really just working with the frame) Which would be better for a full assist situation? I do have some graded hills around me too. Which one would be best?
Accessorizing your bike or scooter can be a lot more fun than searching for replacement parts, because now instead of talking about something you need, we’re dealing with something you might just want. And many riders are going to want things like front and rear battery-powered lights, bicycle baskets for either the front (for groceries or small pets) or the back (for cargo for longer trips), trunk bags and handlebar bags, upgraded fenders for foul weather or simply a neater look, mirrors, upgraded and more comfortable seats, protective gear and a whole lot more.
I haven’t seen that exact BMS in the flesh before, so I can’t speak too confidently about it. The description claims it has a balancing feature and so I assume it does, but I’ve also seen BMS that were supposed to have balancing capabilities, but arrived with the balancing components missing from the board.
A high quality USA battery manufacturer by the name of “Allcell” constructs packs consisting of 18650 cells (cylindrical cells that are 18mm diameter and 65mm long) and uses high tech packing materials to spread out the cells and thus the pack gets a longer life. This is the pack of choice in many high end commercially available ebikes including the Optibike, the Picycle, and the Hanebrink. (click on each to see article on that electric bike). The 18650 battery cell format is mass-produced for laptop computers and cordless tools.
The new Electric Bike Kit Owners group on Facebook has taken off within the first week of its creation. Around 400 people have joined the online group with new members being added every day. E-bike riders are sharing the various ways that they have converted their bikes using the E-BikeKit Complete Electric Bike Conversion System. Each one of the electric bike conversions is more unique than the next. Some e-bike…
Hi Pete! I did really enjoy the Neo line and it seemed like they sold a lot of them so hopefully there will be packs available for several years. Considering that the same pack was used on all of the different models, I feel like you should be in great shape 🙂
But there’s still another issue: now if I just slip my pack inside some shrink wrap tube, I’ll still have exposed ends. This is more or less ok structurally, though it won’t be very water resistant and it will look a bit less professional.
Technically yes, you can bypass the BMS for discharging and just charge through the BMS but this is not recommended. It is better to just choose a BMS that can handle your 50A discharge. BesTechPower makes some great BMS units that can handle 50A and more, depending on the model. They have many options.
Hi Len, I think I understand and was recommending against the added weight and complexity of two motors. It has been done (Easy Motion sells a couple of all-wheel-drive ebikes) but wiring both motors into a single battery could be tricky and the alternative of having two batteries would take up a lot of space and add weight. In terms of torque from mid-drive vs. rear hub, I think it depends on the system you go with, both can be powerful and effective… You made a good point about the chain and rust. I don’t have enough data to recommend one way over the other, both have pros and cons… I might go with the cheaper option since it sounds like the bike is going to get run down in the environment so replacement will be less expensive down the road.
Next, I added the third parallel group after the second, hot gluing it in place in the same orientation as the first, so the top of the pack alternates from positive terminals to negative terminals and back to positive terminals along the first three parallel groups.
Eric has been involved in the electric bike industry since 2002 when he started a 6000 square foot brick and mortar Electric Bike store in downtown San Francisco. He is a true believer that small electric vehicles can change the way we operate and the way we think.
Adam Boesel, inventor of the UpCycle Ecocharger, is using Electric Bike Tech hub motors and working with GM and Chevrolet to build bicycle generators featured at the 2015 Pan Amercian Games! Adam Boesel is using Electric Bike Technologies hub motors on bicycles that generate electricity! Now General Motors has taken his idea to the 2015 Pan American Games and is using them to show people how PLAY can literally…
Secondly, what is your take on modular plastic battery spacers (e.g. http://www.ebay.co.uk/itm/50x-EV-Pack-Plastic-Heat-Holder-Bracket-Battery-Spacer-18650-Radiating-Shell-New/351681365193?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D36381%26meid%3Dfc487881e617412ba361731154a742b5%26pid%3D100005%26rk%3D5%26rkt%3D6%26sd%3D262123820960). Clearly this adds a significant volume penalty and a smaller weight / cost one, but if this is not an issue then how would you rate vs glueing? I can see the benefit of having a space between the cells to limit heat / electrical conductivity in the event of some kind of melt down, but any thoughts?
Court- Excellent article (and I have read a lot). I wonder if you can weigh in on a system I am trying to build. I have a Montague Paratrooper (a bike that folds). I need to fold it and put it in a drift boat. It needs to weigh as little as possible and must have a removable battery and about a 10 mile range with an average speed 20+ mph. I had sort of “settled” on a Bafaang 750 or 1000 watt with Dolphin 52V battery (kit at Lunacycle). Now I am not so sure after reading the pro/con of your article. Cost is certainly an issue and ease of installation. I have been biking with out the motor, and I have numerous fairly steep (6-8%) hills. What do you think I should do? Rear hub, smaller battery. Thanks !
I have come to the conclusion that a 48v battery would probabky be sufficent for my needs. I need to ride continuously for at least 7-8 hours–but prefer up to 10 hours– at 15-20mph everyday. Although I also need a top speed of 30mph, at times. If my math is right, in order to accomplish this I need to build at least a 14s8p battery. After running these specs through a simulator I found that the power starts to drop at about 1150 watts and 20mph.
Given the new trend to make electric bikes look just like other bikes, I am guessing that some creative manufacturers will come up with some radically cool ideas. I wouldn’t rush into buying one of these battery types, however, until they prove themselves in terms of battery life.