Search found 202 matches

by Dui, ni shuo de dui
Apr 18 2019 9:10pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Yamaha V Star 1100 Conversion
Replies: 24
Views: 359

Re: Yamaha V Star 1100 Conversion

No, a wind generator will cost more energy while riding than it will generate. I don't think this is entirely true. I haven't actually tested myself, but in my opinion it will depend where you put the wind generator. I believe that if you put it behind the front wheel, where the radiator is suppose...
by Dui, ni shuo de dui
Apr 18 2019 2:25am
Forum: Motor Technology
Topic: How many Amps can this 3500W rated QS hub motor actually take? (build planning)
Replies: 15
Views: 264

Re: How many Amps can this 3500W rated QS hub motor actually take? (build planning)

425A, holy shit, I guess I don't have to worry about using 200A then :shock: . I think the bike originally did 70km/h @ 72V, not sure what it says about windings, but since my battery is well below what you ran it on, I shoudl be fine. Thanks John! How about controllers - this is a budget focused b...
by Dui, ni shuo de dui
Apr 18 2019 1:41am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Yamaha V Star 1100 Conversion
Replies: 24
Views: 359

Re: Yamaha V Star 1100 Conversion

Twice a year I haul a photographer around the island to cover either the Honolulu Marathon or the Dick Evans bicycle race. The bike race is about 175 miles from the time I leave home till I get back home. That's about the farthest ride there is here. Occasionally, I do a double back but it is still...
by Dui, ni shuo de dui
Apr 16 2019 10:54pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Yamaha V Star 1100 Conversion
Replies: 24
Views: 359

Re: Yamaha V Star 1100 Conversion

I am considering adding a very small generator to add some charge to the batteries as I ride. It doesn't put out a great deal of juice, but it should help extend the range some. The generator's output is about 12v at 1 amp. That's 12W, which is a ridiculously small amount of power, not including th...
by Dui, ni shuo de dui
Apr 16 2019 9:02pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Yamaha V Star 1100 Conversion
Replies: 24
Views: 359

Re: Yamaha V Star 1100 Conversion

Hello all, I've been a biker since I could ride. Bicycles just don't really do it for me but I've seen some very sweet builds here. I own a Yamaha V Star 1100 that died after I put 75k miles on her. I want to change it over to electric. I'm planning on using a Golden Motor 5kw as a mid-drive. I'm n...
by Dui, ni shuo de dui
Apr 16 2019 1:27am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Buell Fuell Flow motorcycle
Replies: 8
Views: 293

Re: Buell Fuell Flow motorcycle

Looks a bit ugly and fat :(
Not a big fan...
by Dui, ni shuo de dui
Apr 15 2019 12:49am
Forum: E-Scooter and Motorcycle General Discussion
Topic: chinese e scooter missing battery pack
Replies: 17
Views: 560

Re: chinese e scooter missing battery pack

no... not installed on the scooter... it's separate and still connects through the female charger port... the entire battery pack apparatus was gone... and the power plug inserted in the compartment through a hole cut in the wall... even the lock apparatus is gone and disconnected... as i said... i...
by Dui, ni shuo de dui
Apr 14 2019 10:02pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: escooter not lasting as expected SLA battery
Replies: 10
Views: 177

Re: escooter not lasting as expected SLA battery

my bike is also a 48v battery, 52 cell lithium ion, i think, otherwise, yeah, itd obviously be different cutoffs. If it shuts off at 36v, then something is wrong with the system. A 48v lithium battery uses 13 cells in series to get the 48v (nominal), which is about 54v fully charged (4.2v per cell)...
by Dui, ni shuo de dui
Apr 14 2019 9:04pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: DP-Ninja 8000W 72V 100MPH
Replies: 19
Views: 533

Re: DP-Ninja 8000W 72V 100MPH

Something the Chinese don't yet understand about (web-savvy) American buyers. They assume "there is a sucker born every minute and two to take them". Wait, that was a PT Barnum quote! Problem is, they're right. I've seen someone selling 12,000mah 18650s, and hundreds of 5 star reviews gushing about...
by Dui, ni shuo de dui
Apr 12 2019 3:38am
Forum: E-Scooter and Motorcycle General Discussion
Topic: DP-Ninja 8000W 72V 100MPH
Replies: 19
Views: 533

Re: DP-Ninja 8000W 72V 100MPH

You're the first person to tell me I haven't under spec'd my build. I hope you're right. I'm not expecting a Hayabusa out of this, but I wanted something closer to a 600cc performance, (0-100 at least) than a 250cc. It depends what kind of 600cc you're targeting since they vary quite a lot in specs...
by Dui, ni shuo de dui
Apr 11 2019 11:03pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: DP-Ninja 8000W 72V 100MPH
Replies: 19
Views: 533

Re: DP-Ninja 8000W 72V 100MPH

I guess it goes to show how rubbery these specifications are (in general. As eBikes.ca says, there's no such thing as an X watt motor). You could reach that speed, but there's no way you'd be able to sustain it without a thermal rollback. I'm building a QS 273 (8kw) model, powered by a Kelly KLS-14...
by Dui, ni shuo de dui
Apr 11 2019 9:00pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: DP-Ninja 8000W 72V 100MPH
Replies: 19
Views: 533

Re: DP-Ninja 8000W 72V 100MPH

I'm trying to build one with slightly higher performance than that, using the same frame. From the feedback I've been given, there is no way those performance specs are real. From owning a Vectrix, I do know cruising about 60mph on the flat takes about 8-9kw, My motorbike has a 3000W rated motor an...
by Dui, ni shuo de dui
Apr 11 2019 8:45pm
Forum: Stand-up E-scooters and E-skateboards
Topic: M365 Very Slow After Rain
Replies: 7
Views: 143

Re: M365 Very Slow After Rain

Haha :lol:

Well that's good news then, otherwise it would have been a tough problem to investigate.
by Dui, ni shuo de dui
Apr 10 2019 10:50pm
Forum: Stand-up E-scooters and E-skateboards
Topic: M365 Very Slow After Rain
Replies: 7
Views: 143

Re: M365 Very Slow After Rain

I used my 2 month old M365 in light drizzle a few days ago and it became very slow It seemed to partially recover over the following few hours after charging, but is now very slow again despite being kept inside in the warm I've checked in side the battery compartment, and it seems perfectly dry, b...
by Dui, ni shuo de dui
Apr 09 2019 12:38am
Forum: E-Scooter and Motorcycle General Discussion
Topic: E-Bike XB-502 conversion project
Replies: 254
Views: 28994

Re: E-Bike XB-502 conversion project

Flux weakening to be very effective needs lots of exposed iron on the armature. An IPM inrunner is best for FW. Otherwise FW has a small effect. The controller can do FW, but it's not on since it provides a small increase in motor RPM. FW increases phase current and reduces motor efficiency. Ah yes...
by Dui, ni shuo de dui
Apr 08 2019 10:29pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: E-Bike XB-502 conversion project
Replies: 254
Views: 28994

Re: E-Bike XB-502 conversion project

If your only problem is top speed, can't you find a way to do flux weakening? I don't know what controller you're using, so maybe it's not possible on yours, but I think that's the only way you could have both torque and top speed without having to use a mechanical gearbox.
by Dui, ni shuo de dui
Apr 08 2019 8:41pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Can I use my 36v motor with a 48v battery and controller?
Replies: 3
Views: 133

Re: Can I use my 36v motor with a 48v battery and controller?

Hi all. Im new at this (as my question might show) I have a e-scooter with a 36v system and I want to connect a 48v battery and controller to the 36v motor (the motor is new,and i cant find a motor the same size, so that is a problem) So is there any way I can make the 36v motor work with the 48v c...
by Dui, ni shuo de dui
Apr 07 2019 10:16pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Chopper/Bobber/Custom - motor tips
Replies: 9
Views: 290

Re: Electric Chopper/Bobber/Custom - motor tips

Being able to take out 40kW for a couple of seconds sounds awesome. I am just concerned that 8kW will not be enough to sustain 100km/h. If I calculate with a drag coefficient of 0.5 I get that roughly 8kW is needed to drive a motorcycle in 100km/h. My motor is just a 3000W and it sustains 120km/h w...
by Dui, ni shuo de dui
Apr 07 2019 9:54pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Ninja 250 "Clone" Made in China
Replies: 48
Views: 5632

Re: Ninja 250 "Clone" Made in China

Looking good so far, any updates on the battery box? And what was the slow acceleron like with the other controllers, have done a shunt mod to get more amps. Quite slow progress, I'm experimenting with the carbon fiber. I tried the ghetto vaccum molding just to get a basic test before doing it on t...
by Dui, ni shuo de dui
Apr 03 2019 8:56pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Small motorcycle build help KM100
Replies: 7
Views: 305

Re: Small motorcycle build help KM100

You are my hero I was also thinking the 2000w my self. Your imput is appreciated so much. You just made my day. We are in the process of building a 20ah battery out of reclaimed cells. The discharge testing is very time consuming but very very rewarding. Glad I can help, keep us posted on the progr...
by Dui, ni shuo de dui
Apr 03 2019 8:42pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Light Electro Bober (short version)
Replies: 44
Views: 1191

Re: Light Electro Bober (short version)

Alexander1971 wrote:
Apr 03 2019 8:13am

parts are made on a milling machine
That's a clever solution, it doesn't seem to require any welding.
Great work, can't wait to see it finished!
by Dui, ni shuo de dui
Apr 03 2019 3:39am
Forum: E-Bike General Discussion
Topic: sabvoton SVMC72200 blew on 1st run
Replies: 21
Views: 643

Re: sabvoton SVMC72200 blew on 1st run

Ok so final rundown on the controller and fixes ive made. So ive tested it at peak power and everything seems good. Lifts the front up with ease, pulling about 8-10kw. My best guess with the old controller is that it was a dud from the get go and was going to blow either way. Other problem i had wa...
by Dui, ni shuo de dui
Apr 03 2019 3:28am
Forum: E-Bike General Discussion
Topic: Any High Powered, Sporty Handling Ebikes?
Replies: 27
Views: 860

Re: Any High Powered, Sporty Handling Ebikes?

In any case, right now I'm more just wondering if anyone else here has built sporty ebikes, or knows of any good builds to look at. I'm currently on a Trek MTB with Fox fork, hydraulic brakes, Schwalbe Big Ben tires, etc, etc. Not shitty quality, handles fine for what I use it for(bike delivery). B...
by Dui, ni shuo de dui
Apr 02 2019 11:22pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Light Electro Bober (short version)
Replies: 44
Views: 1191

Re: Light Electro Bober (short version)

Wow, that's an amazing build, kudos! We need more pics and more descriptions, don't be shy! I'd like to build this kind of flat sheet frames one day, but I always wondered: how do you attach the main tube for the front fork ? (sorry, I'm not sure how it is called in english, I mean the tube with the...