Search found 654 matches

by Cephalotus
Dec 19 2013 6:49am
Forum: E-Bike Technical
Topic: Is my MAC 8T temp sensor lying to me?
Replies: 19
Views: 864

Re: Is my MAC 8T temp sensor lying to me?

I should mention I live in FL and the entire route is quite flat. There is a very mild bridge I go across for around a minute but I bet most of you guys have small hills that are more of a grade than this bridge.... I wonder why you need 1300W on a flat area to maintain a speed of "only" 31mph. To ...
by Cephalotus
Dec 19 2013 6:35am
Forum: E-Bike Technical
Topic: Are hubmotors going to get lighter?
Replies: 43
Views: 4072

Re: Are hubmotors going to get lighter?

The Falco Dxm will weigh 2.0kg, according to their specification: http://www.falcoemotors.com/products/motors/dxm/index.html#.UrLQfVMRTmJ yes. Very attractive. I'm waiting since 2-3 years for their lightweight DD motor to materialise. Afaik you still can't buy this motor. The bigger one that is ava...
by Cephalotus
Dec 19 2013 5:25am
Forum: E-Bike Technical
Topic: Are hubmotors going to get lighter?
Replies: 43
Views: 4072

Re: Are hubmotors going to get lighter?

Cute 85 front motor weights around 1,7kg, Cute 75 from motor around 1,5kg and a Keyde hub rear motor weights 2,0kg incl. controller and CST. A BionX SL motor weights 3,4kg incl. controller, afaik this still is the most lightweight DD motor. BionX claims that the case is made from some magnesium allo...
by Cephalotus
Dec 19 2013 5:14am
Forum: E-Bike Technical
Topic: === 3000W BionX Project ===
Replies: 20
Views: 1757

Re: === 3000W BionX Project ===

Few tried to use thes emotor with external controller and it worked well unitil they increase power and break the axel wich is by far not mad efor additional torque. Thank you. The SL motors have a much thicker axle and since 2012 the material of the axle has been improved, afaik. With the standard...
by Cephalotus
Dec 18 2013 4:00pm
Forum: E-Bike Technical
Topic: === 3000W BionX Project ===
Replies: 20
Views: 1757

Re: === 3000W BionX Project ===

How did that project end?

Anyone who used a BionX motor with an external controller?
by Cephalotus
Dec 16 2013 3:51pm
Forum: E-Bike General Discussion
Topic: Hydrogen fuel cell range extender EBIKE
Replies: 45
Views: 4593

Re: Hydrogen fuel cell range extender EBIKE

some at the pedelec forum doubt that the go::batt 375 will really have an efficiency of >25% a weight of only 1kg and can really output 75W as claimed. For example the claimed 375W come from a built in buffer battery. This technology isn't yet developed far enough for everyday use. 75W continuous a...
by Cephalotus
Dec 16 2013 9:38am
Forum: E-Bike General Discussion
Topic: Hydrogen fuel cell range extender EBIKE
Replies: 45
Views: 4593

Re: Hydrogen fuel cell range extender EBIKE

Here is an e-gas project example from AUDI: https://www.audi-mediaservices.com/publish/ms/content/en/public/pressemitteilungen/2013/06/25/world_premiere__audi.html well to wheel analysis: (in German, incl. pictures) : http://www.audi.de/content/dam/ngw/company/Corporate_Responsibility/PDF/Audi%20e_g...
by Cephalotus
Dec 16 2013 9:27am
Forum: E-Bike General Discussion
Topic: Hydrogen fuel cell range extender EBIKE
Replies: 45
Views: 4593

Re: Hydrogen fuel cell range extender EBIKE

I'm waiting for these: go::batt 375 With the help of the gas battery go::batt 375 you will obtain electrical independence, allowing extraordinary mobility for your recreational vehicle, power tools and many other devices. Product specifications: Power output: 75 W of continuous output Peak power out...
by Cephalotus
Nov 23 2013 4:12am
Forum: E-Bike Non-hub Motor Drives
Topic: more efficient hub or mid drive
Replies: 80
Views: 8036

Re: more efficient hub or mid drive

The OP was referring to Ebikes at 40-45 mph. Unless you have a very advanced crank assy, you wont be able to pedal at that speed., ...and even if you do, the paltry 100 - 200 Watts that you contribute is pointless compared to the 3kWatts needed just to cruise at that speed . Ok. English is not my m...
by Cephalotus
Nov 21 2013 10:32am
Forum: E-Bike Non-hub Motor Drives
Topic: more efficient hub or mid drive
Replies: 80
Views: 8036

Re: more efficient hub or mid drive

What's the point of an electric bicycle if you don't pedal? A (small) hub motor with no pedal assist will stop going uphill at some point and its efficiency will be 0% by definition. Is this a realistic setup? I don't think so, not if you want to compare motors for bicycles! Yes, the human power and...
by Cephalotus
Nov 20 2013 7:47am
Forum: E-Bike Non-hub Motor Drives
Topic: more efficient hub or mid drive
Replies: 80
Views: 8036

Re: more efficient hub or mid drive

It depends. This was a "city bike style" bike with a BionX motor: First is my girlfriend during a 27km ride in hilly terrain. Power consumption was 3,2 Wh/km and regen was 0,9 Wh/km, so battery consumption was 2,3Wh/km Second was part of a recuperation test myself at a roughly 6% hill and 20kg of ex...
by Cephalotus
Nov 20 2013 7:16am
Forum: E-Bike General Discussion
Topic: The new d-Series BionX (monster) motor
Replies: 9
Views: 3577

Re: The new d-Series BionX (monster) motor

with a motor that slim, the efficiencies can't be very high. The usable magnetic flux coming from the flat part of the wire turns is going to be pretty small compared to all that wasted copper in the ends of the turns. Probably not if the coils itself are rather small (and if you have plenty of the...
by Cephalotus
Sep 20 2013 2:48am
Forum: E-Bike General Discussion
Topic: Cute Q100 lightweight builds slow mtb, fast road
Replies: 291
Views: 54810

Re: Cute Q100 lightweight builds slow mtb, fast road

Futue plans: swap out the 36v 201rpm motor for a 24v 201 rpm motor (which will run 300rpm at 36v). Build a small light 2.0KG 36v8ah battery that can mount in the frame triangle The 24V 201rpm motor is the same as the 36V 328 rpm motor. In reality the 36V 201 rpm motor has a bit more than 201rpm, mo...
by Cephalotus
Sep 20 2013 2:45am
Forum: E-Bike General Discussion
Topic: Cute Q100 lightweight builds slow mtb, fast road
Replies: 291
Views: 54810

Re: Cute Q100 lightweight builds slow mtb, fast road

I’m building two bikes. Power is 36V10Ah: 1) Mountain bike (slow speed) which I would like to top out with pedal assist at 20. Motor is slow wind (210) Q100. Goal: Motor optimized for 5-20mph. 2) Road bike (higher speed) which I would like to top out with pedal assist around 26. Wheel build is in p...
by Cephalotus
Aug 30 2013 4:07am
Forum: E-Bike General Discussion
Topic: Reef Invisitron - claims 11kg and 100km range
Replies: 79
Views: 14941

Re: Reef Invisitron - claims 11kg and 100km range

Well that's easy, a mid drive back through the gears on a basic frame. A 7 speed would be legal and keep up with them all, save you a grand, and be less than 15kg if you have custard arms. What is a "7 speed" and why is it legal? Remember that I'm comming from a different part of the world. Here (D...
by Cephalotus
Aug 30 2013 3:49am
Forum: E-Bike General Discussion
Topic: Reef Invisitron - claims 11kg and 100km range
Replies: 79
Views: 14941

Re: Reef Invisitron - claims 11kg and 100km range

Hang on a minute reef. Relax yourself. I'm sitting in Germany and have never been to Australia (which is a pity and I hope I will be able to vistit there sometimes in the future) I wasn't asking you to carry a 25kg bike up stairs. A kilowatt bike can easily match yours (sorry, theirs) at 15kg. Sure...
by Cephalotus
Aug 30 2013 3:31am
Forum: E-Bike General Discussion
Topic: Reef Invisitron - claims 11kg and 100km range
Replies: 79
Views: 14941

Re: Reef Invisitron - claims 11kg and 100km range

the whole fascination with weight within a few kilos is concerning. Imho it isn't. At least not for those people that want an electric ASSISTED ... BIKE. Of course this id difefrent to those that want an electric motorcycle with pedals (and bike privileges) A large part of Ebiking is about getting ...
by Cephalotus
Aug 29 2013 6:18pm
Forum: E-Bike General Discussion
Topic: Reef Invisitron - claims 11kg and 100km range
Replies: 79
Views: 14941

Re: Reef Invisitron - claims 11kg and 100km range

1kkg will not give you the worlds most lightweight electric assisted bike available for sale. I do not know the winner, but at least you have to beat 9,5kg (incl battery): http://vivax-assist.com/global/img_bikes/img_vivax/img_vivax_2014/vivax-veloce-CF_2014_E-Rennrad_web.jpg http://vivax-assist.com...
by Cephalotus
Aug 29 2013 7:50am
Forum: E-Bike General Discussion
Topic: The new d-Series BionX (monster) motor
Replies: 9
Views: 3577

The new d-Series BionX (monster) motor

This isn't a joke or a fake. BionX introduced a huge (and slim) direct rear drive hub motor, the new d-series : weight: 3,9kg continous power: 250% more than previous BionX motors... officially sold as a 250W motor in Europe. http://products.wheeler.ch/media/catalog/product/cache/10/image/2300x/602f...
by Cephalotus
Aug 05 2013 7:21am
Forum: Battery Technology
Topic: 18650 cell test: Panasonic vs. LG
Replies: 53
Views: 30865

Re: 18650 cell test: Panasonic vs. LG

circuit wrote:OK, will do 50 cycles at 1C discharge and 0.5C charge.
Maybe you also need active cooling..
by Cephalotus
Aug 05 2013 7:20am
Forum: Battery Technology
Topic: 18650 cell test: Panasonic vs. LG
Replies: 53
Views: 30865

Re: 18650 cell test: Panasonic vs. LG

This is strange, because all rates are the same as for LG. Ri of LG cell is even higher, and so C rating should be lower than Panasonic's. And LG performed quite better at 1C. If tested at 0.5C, LG would do a lot better, too. I don't know anything about LG and I'm unable to comapre them, but I know...
by Cephalotus
Aug 05 2013 6:43am
Forum: Battery Technology
Topic: 18650 cell test: Panasonic vs. LG
Replies: 53
Views: 30865

Re: 18650 cell test: Panasonic vs. LG

Panasonic NCR cells die early at 1C charge rates. This is nothing unexpected.

Charge them at 0,5C maximum (better 0,3C) and discharge them at 0,5C and they should live a lot(!) longer.
by Cephalotus
Jul 24 2013 6:08pm
Forum: Battery Technology
Topic: Victpower battery pack after 1 year
Replies: 166
Views: 11351

Re: Victpower battery pack after 1 year

These packs are not the paragon of safety, but it takes some real effort to get an A123 cell to explode, and I'm not sure it can be done at all with a pouch cell. You can get the cylindricals to do it every now and again if you overcharge with huge current. This thread seems to have gone hyperbolic...
by Cephalotus
Jul 24 2013 2:34pm
Forum: Battery Technology
Topic: Victpower battery pack after 1 year
Replies: 166
Views: 11351

Re: Victpower battery pack after 1 year

I purchased the an A123 20AH pack from Victpower 1 year ago. And I was very happy at this time. But now my pack stopped working. I looked at the pack and the box expanded:... What you got is a bomb not a battery. I have never seen something like that before (that was not intended to explode). It's ...
by Cephalotus
Jun 22 2013 6:09am
Forum: E-Bike General Discussion
Topic: Building my own dream elektrical bike!
Replies: 27
Views: 3819

Re: Building my own dream elektrical bike!

1 motor that will bring me up to a speed of 65+km/h. If you want to sit upright you need at least 2000W mechanical power at the wheel to achieve that (around 2500W electric power). http://www.kreuzotter.de/english/espeed.htm If you want to survive in the long end you need a different frame. Also th...