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Hello Frank, I know the maximum output of this motor is 282W at 180 RPM from the bafang tech sheet but I don't know what the power is at 100 RPM (climbing 5% hills) and at 50 RPM (climbing 10% hills).

for my little project, where can I find the Power out versus RPM of the Bafang SWXK-5? thank you for your help.

flecc, there was a thread on this forum yesterday (or the day before) about the possible arrival of the sludge battery. Essentially, they invert the state of the 3 elements: anode (solid), salt bridge (liquid), cathode (solid) into liquid, solid, liquid. I just wonder if, at the rear wheel, we...

shouldn't we talk about how good can ebikes be in the future rather than the depressing spectre of Chinese conversion kits sold at your local pound shops? Would someone like to give me some idea how I can theoretically design a replacement of the rear cassette to act as a gearbox?

that battery... can't you put it under the seat?

True, that's because you can buy a Chinese 'Honda' for less than $1000 when ebikes are sold in the same countries for about the same money. In Malasia, petrol costs about 1.4 Malaysian Ringit (30p) a litre, a little more in Vietnam (about 40p a litre). If you sell ebikes for $500 - you have an...

flecc, the internet broadens the range of margin an ebike business can consider. All businesses start more or less with the same base price, in China. Battery prices go the way of flat screen TVs. Size goes up, prices halved in less than 5 years. I just take a look at ebay: 24V 10AH with...

Frank, I would draw a parallel between office PC users and ebike commuters, home PC users with ebike weekend riders. The former's need would be fulfilled by sub £600 bikes like the Woosh Siroccos, the latter would not be happy with anything less than £1000 bike. But that's where the parallel...

flecc, China may have produced 27M ebikes in 2010 but only exported less than 1M to the EU. Where did the rest go? There is huge scope for exporting to populous countries that don't have oil of their own. Ebikes present a different kind of challenge to the like of Tescos. They can sell fridges...

Frank, kits like the daahub are a bit better presented than Bmsbattery's but they all suffer the same problem: too many components, too many points of failure. Back in the 90's, an average PC had 3 addon cards. How many are there in a modern office PC or laptop? none.

All the current ebikes without exception is no where as reliable as an average PC or a mobile phone. Just wait a couple of years. You wrote yesterday that China has adopted EU standards, that means they saw the future of making not 27M bikes like last year but 270M in 2013.

Frank, one big reason why you haven't seen so many bike shops getting on the bandwagon yet is because most conversion kits are not reliable enough. A good design must be mechanically sound, that's not what I see with the current crop of kits. You need kits that work like a Kalkhoff bike: click...

Call me a cynic but I think the market will follow the PC business pattern. Back in the early 80's, IBM and Compaq PCs dominated the high end of the market, the importers cum assemblers of the like of Dan, Viglen, Watford Electronics and Elonex occupied the budget end. There was not much in the...

Idea for a test: Equip a bike with your pedals and put it on its stand. Connect the rear wheel to a dynamo. Cycle with the assistance of your pedals and as little leg work as possible. Collect the data on the dynamo output. Switch off the pedals. Cycle normally. Collect the data on the...

Hello Stephen, your motors may burn 180kJ in half hour but you still need to subtract the heat produced by your system to get the net useful work.

there may be the possibility of using super capacitors for ebikes.

probably commercially viable but breakthrough it is not. The new design offers the possibility of quick recharge by replacing the spent sludge with fresh sludge, which makes sense in the case of of a large electric truck but for a bike, it would be faster to swap batteries. As for the claim...

I know the money is safe, Paypal guarantees that side, not bmsbatterry. Bmsbattery is good if the items you order are in stock like they say on their website, are what they describe on their website, and are shipped in the delay that they say on their website. If any of these factors fails, why...

Very practical remark!

cwah, that quote from the supplier seems to be a little OTT. The patent for LiMgFePO4 holder is Valence Technology, an excellent firm without a doubt, made lots of money selling their batteries to Segway. Unlike Busettii, they still use the generic term Lithium Phosphate for their batteries and...