Search found 767 matches

by jag
Apr 16 2011 10:33pm
Forum: E-Bike Build Threads / Photos & Video
Topic: UK Road rage Ebiker?
Replies: 26
Views: 3270

Re: UK Road rage Ebiker?

That video shows exactly how I was hit biking to school several years ago. I was in a roundabout, car comes from the side. Luckily for me it was a car and not a truck like in the video. My bike was hit by car bumper and totaled, while I was thrown to the side out of harms way. The guys car insurance...
by jag
Apr 06 2011 11:37am
Forum: E-Bike Technical
Topic: How can we power big low resistance motors?
Replies: 7
Views: 1037

Re: How can we power big low resistance motors?

so back to my tale: i then spent 5 hours separating all the motor phase wires out into 2 full sets, both of them terminating in wye (separately) so think of it as 2 separate stators each with 3 phase wires and a controller for each, running off i set of halls, and always timed together. i hooked up...
by jag
Apr 04 2011 2:59pm
Forum: Battery Technology
Topic: Cheap Meanwell Supply Source??
Replies: 32
Views: 5979

Re: Cheap Meanwell Supply Source??

mine trimmable by default from around 44v to 50.2 but playing with "Voltage programming" pin(D1 on the picture below) and applying there voltage from 0 to +5v i succeeded to trim it from 41.2 to around 56.5 which was enough for to charge my 16s1p 15ah battery (made from cell_man`s a123 puches) in 3...
by jag
Apr 03 2011 11:42pm
Forum: Battery Technology
Topic: Cheap Meanwell Supply Source??
Replies: 32
Views: 5979

Re: Cheap Meanwell Supply Source??

Also.. usually the max voltage is limited by a voltage divider.. and also the max V of the capacitor... i never needed to modify these voltage divider close to the pot that adjust the voltage on any psu If there is a potentiometer! Many of these telecom PSU's are microprocessor controlled and have ...
by jag
Apr 03 2011 10:44pm
Forum: Battery Technology
Topic: Cheap Meanwell Supply Source??
Replies: 32
Views: 5979

Re: Cheap Meanwell Supply Source??

http://shop.ebay.com/?_from=R40&_trksid=m570&_nkw=CAR1248FPB These 48V Cherokee psu are really cheap! and yes.. they are adjustable in a great range and do the CC-CV! Specs say 48V +- 10% so 52.8V max Seems like it is set by an analog voltage in. (More convenient than the Eltek Flatpacks that have ...
by jag
Mar 30 2011 2:56pm
Forum: E-Bike Technical
Topic: Q85 250W motor current load issue
Replies: 7
Views: 2045

Re: Q85 250W motor current load issue

Hi, Did you buy the bare motor or their "ebike kit" laced into wheel? Would you mind weighing the motor? While BMS battery specs says 1.6kg, rumours are that it is a bit heavier at about 2kg. I'm curious to know the weight. Also if already laced, please let us know rim type and spoke gauge so we can...
by jag
Mar 14 2011 10:07pm
Forum: General Discussion
Topic: Some disaster preparedness thoughts
Replies: 24
Views: 3241

Re: Some disaster preparedness thoughts, also need advice...

Neither NiCd nor NiMH keep their charge long. Typically only a month to a few months. They are excellent to replace regular AA batteries in frequently used appliances where they will be recharged and used regularly. However, keeping a large stash of AA nickel batteries charged just for emergency pur...
by jag
Feb 26 2011 4:39pm
Forum: General Discussion
Topic: The futility of the Prius and the end of the world …
Replies: 47
Views: 4282

Re: The futility of the Prius and the end of the world …

If average Joe would actually do a rational cost-benefit analysis we would be way ahead. People would buy houses they could actually afford, so no housing bubble; drive vehicles (or use other transportation options) that make sense, instead of behemoth SUV and trucks; demand efficiency and accounta...
by jag
Feb 26 2011 3:34pm
Forum: E-Bike General Discussion
Topic: Batteries for long tours
Replies: 32
Views: 3017

Re: Batteries for long tours

So what chargers would you recommend? :? Most people seem to be getting the Meanwell S350. About $50 shipped from ebay. For your 36V Ping trim it down to 43V using the potentiometer on the back. It will output constant current at about 10A to charge your 15Ah in about 1.5h. Check with Ping if the B...
by jag
Feb 26 2011 3:13pm
Forum: General Discussion
Topic: The futility of the Prius and the end of the world …
Replies: 47
Views: 4282

Re: The futility of the Prius and the end of the world …

I bet there are people flocking to the dealerships test driving the Prius this weekend because of rising gas prices. I love it! But in the end, they go home and do cost analysis spreadsheets etc... it all comes down to the dollar. If average Joe would actually do a rational cost-benefit analysis we...
by jag
Feb 26 2011 1:36pm
Forum: E-Bike Non-hub Motor Drives
Topic: Cyclone Double Freewheel Motor for Yuba Mundo
Replies: 17
Views: 5211

Re: Cyclone Double Freewheel Motor for Yuba Mundo

A dual freewheel through-the-cranks drive will work for a single front, but would be more complicated to install on the new Yuba with a triple front chainring. (need a rear derailleur for tensioning, and chain angles may be steep). Personally, I don't think there is any advantage to a 500W cyclone o...
by jag
Feb 26 2011 1:18pm
Forum: Battery Technology
Topic: What do you think of this BMS. 24S Li-ion/lifepo 100A
Replies: 3
Views: 627

Re: What do you think of this BMS. 24S Li-ion/lifepo 100A

Might be an unusual, interesting design: I see no resistors and no capacitors. I'm guessing that they simply drive the FET in the continuous/analog range and sink the balancing energy into the FET instead of turning a FET on and sinking it into a resistor. The FETs are all connected together thermal...
by jag
Feb 26 2011 10:26am
Forum: E-Bike General Discussion
Topic: Cyclone 1000 (3000) Watt motor as "Mid Drive"
Replies: 11
Views: 2414

Re: Cyclone 1000 (3000) Watt motor as "Mid Drive"

Thank you Jag, it would seem to make something like a 9T to 144T #25 chain would be required at that kind of RPM, however, it wouldn't be bad, just require more specialized parts. Could also use a belt for quiet operation. For moderate power levels maybe a 28:272 using the 272 GEBE rear pulley and ...
by jag
Feb 25 2011 11:48pm
Forum: E-Bike General Discussion
Topic: Cyclone 1000 (3000) Watt motor as "Mid Drive"
Replies: 11
Views: 2414

Re: Cyclone 1000 (3000) Watt motor as "Mid Drive"

That being said, it would appear that this motor is running pretty fast, and would require much more reduction I clocked the cyclone 1000W motors to 4000rpm unloaded at 48V, so design gearing for maybe 3000-3500 loaded rpm. You would need more reduction than using a hub motor to power a mid drive, ...
by jag
Feb 25 2011 5:42pm
Forum: E-Bike Reviews & Testing
Topic: 1000 watt Aotema Maxi-Might Cooked
Replies: 89
Views: 12488

Re: 1000 watt Aotema Maxi-Might Test Data

I not been able to spend much time on updates lately. Have only ridden a couple more times, still same settings, but now hits 72 kmh easily, and I have to lean forward a bit to keep the front wheel down :D . Perhaps the batteries are breaking in and the resistance is lower? Maybe it's because it wa...
by jag
Feb 25 2011 12:45pm
Forum: E-Bike General Discussion
Topic: How cold is too cold for your motor?
Replies: 36
Views: 3490

Re: How cold is too cold for your motor?

I know that crystalyte 5300 serie are not affraid by -30 :mrgreen: 23 jan 2011: jXrkEEusGMU Don't trust that thermometer you're using outside below freezing temps. I have the same one. While it is accurate to a degree or so when indoors in a stable ambient temperature around 20C, outdoors at -25 ev...
by jag
Feb 24 2011 10:59pm
Forum: General Discussion
Topic: The futility of the Prius and the end of the world …
Replies: 47
Views: 4282

Re: The futility of the Prius and the end of the world …

The elephant in the room is population. Good time to cut Planned Parenthood funding. Adopt the "One Child" policy. It's worked OK for China.................. Jeremy You're up against world religion which depends on "be fruitful and multiply; populate the earth abundantly" (Genesis 9:7) The problems...
by jag
Feb 24 2011 2:11pm
Forum: General Discussion
Topic: The futility of the Prius and the end of the world …
Replies: 47
Views: 4282

Re: The futility of the Prius and the end of the world …

Hi Toshi, Thanks for a thoughtful post. I keep a selective list of noteworthy topics and put yours in there too. Like you, I agonize over how in comparison to other wasteful use of energy, the savings of riding my eBike instead of driving are like a drop in the sea. Like you I see the bumper-to-bump...
by jag
Feb 22 2011 7:10pm
Forum: E-Bike Technical
Topic: 2 place velomobile
Replies: 39
Views: 17321

Re: 2 place velomobile

Thinking something like this: http://en.wikipedia.org/wiki/File:Fantom2sits.jpg Only varnish where the burgundy is, and burgundy where the white is, http://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/Fantom2sits.jpg/270px-Fantom2sits.jpg That is a picture of a cult velomobile. First appeared ...
by jag
Feb 22 2011 5:54pm
Forum: E-Bike Technical
Topic: Bafang or Cute? and freewheel question
Replies: 21
Views: 4223

Re: Bafang or Cute? and freewheel question

I agree that good information on low weight and low power options is scarce. There is a range of eBike possibilities from low weight low power hub motors to high weight and power hub motor, and as a different category are more DIY solutions such as friction drives and RC belt/chain drives. The mediu...
by jag
Feb 22 2011 1:48pm
Forum: E-Bike Technical
Topic: Bafang or Cute? and freewheel question
Replies: 21
Views: 4223

Re: Bafang or Cute? and freewheel question

Your title question "Bafang or Cute" is a good one, and I think it is not authoritatively answered on ES. By contrast in the heavier hub motor classes (BMC/MAC, 9C, Clyte), there is both 3rd party technical data and true comparative user tests posted. For the "Bafang or Cute", one has to still specu...
by jag
Feb 22 2011 11:53am
Forum: General Discussion
Topic: Upgrading BMC 50A controller - advice -
Replies: 3
Views: 679

Re: Upgrading BMC 50A controller - advice -

Hi Guys, I've got a BMC 50A controller. It's rated at 48V and I'm told from a reputable source that it can handle a max of 60V. From what I can see this 60V figure is derived from the upper voltage limit of the 5 main capacitors inside (63V, 1000uF). My question is: If I replace the 63V capacitors ...
by jag
Feb 22 2011 11:34am
Forum: E-Vehicles General Discussion
Topic: Ryno motors - self-balancing, one wheel, electric scooter
Replies: 16
Views: 2230

Re: Ryno bike - when two wheels are too much!

This Ryno unicycle balancer looks way cool! Segway did it only halfway: Dynamic balancing backward/forward, but static sideways. Here we finally have one that is 2DOF dynamic. Very interesting from a control theory point of view. E.g. what control strategy is best to recover a jump up a curb? How to...
by jag
Feb 17 2011 11:27pm
Forum: Battery Technology
Topic: the importance of heating/cooling your batteries
Replies: 72
Views: 4896

Re: the importance of cooling your batteries

I'm taking a python class this semester, so maybe this would be a good first "practical" project. Python is a decent language I've heard. Lots of people use Matlab for scripting mathematical calculations and programs. You can either download an open source version "octave" http://www.gnu.org/softwa...
by jag
Feb 17 2011 11:10pm
Forum: E-Bike Technical
Topic: 2 place velomobile
Replies: 39
Views: 17321

Re: 2 place velomobile

Very nice project. I had sketched a lightweight family velomobile to be built with dacron on a wood frame (like airplanes) a year ago, but still have not managed to convince the wife about electric transportation. Also would probably take me forever to complete (I have a canvas-on-frame canoe that h...