Search found 2908 matches

by motomech
Jan 19, 2018 10:45 am
Forum: Motor Technology
Topic: Clutch slipping in geared hub
Replies: 2
Views: 50

Re: Clutch slipping in geared hub

Two things; 1)If a Hall sensor fails, the motor tend not to "sync.-up" and sounds and acts like it has a mechanical problem. If I were you, I would test the Halls to make sure one or more is not the problem. 2) Are the rollers held against the ramps by sm. springs? If so, you might want to inspect t...
by motomech
Jan 19, 2018 10:30 am
Forum: E-Bike Technical
Topic: Cute Q100H Autopsy & Modify 2017
Replies: 9
Views: 196

Re: Cute Q100H Autopsy & Modify 2017

Good question - I haven't really looked. I have. I believe I read every thread/post that mentions Q128H on this site. And damn there are a lot of them; even if you exclude those where the mention is in someone sig. But the picture that emerges is very confused, because there seem to have been at le...
by motomech
Jan 16, 2018 5:21 pm
Forum: E-Bike General Discussion
Topic: Bafang 48v500w vs Mac 48v1000w
Replies: 6
Views: 210

Re: Bafang 48v500w vs Mac 48v1000w

I see from your other post the Aliexpress Mac kit is the CST(cassette), which makes it an even better deal. But it is still more expensive than the BPM CST kit from BMS Battery; https://bmsbattery.com/ebike-kit/347-bafang-bpm2-36v500w-rear-driving-bike-conversion-kit-ebike-kit.html Here is a little ...
by motomech
Jan 16, 2018 9:59 am
Forum: E-Bike General Discussion
Topic: Bafang 48v500w vs Mac 48v1000w
Replies: 6
Views: 210

Re: Bafang 48v500w vs Mac 48v1000w

Ok, that's a good price if those are the kit components you want to use. The problem is, they don't tell us much about the controller other than it's rated 30 Amps max. Experienced builders these days are tailoring their controllers to their build, whether it's an Infineon that can be paired with a ...
by motomech
Jan 15, 2018 1:20 pm
Forum: E-Bike General Discussion
Topic: Bafang 48v500w vs Mac 48v1000w
Replies: 6
Views: 210

Re: Bafang 48v500w vs Mac 48v1000w

I'm curious, where can we buy a Mac that is "almost cheaper" than a BPM? I'm not asking about the BPM CST, which is about $250 plus shipping for a bare motor, but the standard free wheel type(like the Mac) BPM, which is about $140, plus shipping.
by motomech
Jan 11, 2018 5:17 pm
Forum: Battery Technology
Topic: MeanWell HLG vs ELG as charger
Replies: 16
Views: 254

Re: MeanWell HLG vs ELG as charger

I crossed the leads on one of my HLG's when I first got it, no damage. There is no reason for the PS to be off when still connected. At top charge it just sits there w/ a soft switching sound, drawing very little Current. I unplug it after the battery is disconnected. I have been using these for a c...
by motomech
Jan 03, 2018 1:11 am
Forum: Battery Technology
Topic: NEED Lipo HELP
Replies: 16
Views: 619

Re: NEED Lipo HELP

matt54 asked; I have all the components for my ebike I just have to assemble. First off what gauge wire do you use? I plan on wiring a watt meter, lights and other accessories. It seems that 10awg will be more than enough. 10 awg wire is heavy, a little too thick to use w/ 4 mm bullet connectors and...
by motomech
Dec 30, 2017 7:26 pm
Forum: Battery Technology
Topic: Multistar charger
Replies: 18
Views: 619

Re: Multistar charger

Dman brings up a good point that went right over my head(I was focused on a charging solution). MultiStar trades C-rate for smaller size, lower weight and lower volatility. It just doesn't have the "punch" behind it like a higher C-rate LiPoly. Icecube57 has done some extensive testing w/ the MultiS...
by motomech
Dec 30, 2017 7:15 pm
Forum: E-Bike Technical
Topic: opening a Bafang CST... and putting it back!
Replies: 5
Views: 183

Re: opening a Bafang CST... and putting it back!

Did you count the number of teeth on the replacement gears? I believe the gear ratios are particular to the CST and the gears from the other BPM's will not work.
by motomech
Dec 29, 2017 3:24 pm
Forum: Battery Technology
Topic: Multistar charger
Replies: 18
Views: 619

Re: Multistar charger

hello I've been looking at the hobbyking battery medic. Are they good for me? Unfortunately, the Original Battery Medic has been cloned and the clones are junk. The Black ones are especially bad as they over-heat and the screen goes black. HK should not be selling those as they are a rip off. There...
by motomech
Dec 27, 2017 8:18 pm
Forum: E-Bike General Discussion
Topic: Loose triangle battery bag solved
Replies: 5
Views: 393

Re: Loose triangle battery bag solved

Thanks for this post im currently running into the same problem however my bike frame has the rear cable for break/derailer running along the bottom tube. my battery is two 6s 16ah lipo bricks i do not want the battery resting on the bottom of the bag. Im sure i will think of something but im quite...
by motomech
Dec 27, 2017 8:04 pm
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 611

Re: Higher top speed question for motor gurus

Start with the highest pack Voltage that fits into your "comfort zone", then select the motor speed that will give your desired top speed. Example: My Mean Well power supplies that I use for charging have a top charge Voltage of approx. 58 Volts. Since I am not a novice nor an expert, I select 54 Vo...
by motomech
Dec 26, 2017 1:42 am
Forum: E-Bike General Discussion
Topic: Rear Q128H planetary gears?
Replies: 43
Views: 2743

Re: Rear Q128H planetary gears?

Update: never mind, I found a better picture and I see the straight cut planets engage directly to the ring gear. (It didn't look possible in the pics above.) image3.JPG image2-1.JPG image1-2.JPG An old thread, but these are the best pics of the q128 internals I've found anywhere. I wonder if you c...
by motomech
Dec 22, 2017 7:30 pm
Forum: E-Vehicles General Discussion
Topic: Front Suspension Issues
Replies: 1
Views: 115

Re: Front Suspension Issues

Well, they are $50 forks.
But on the other hand, they are well reviewed @ MTBR.
Lot's of set-up and maintenance tips here;
http://www.mtbr.com/cat/older-categorie ... 20crx.aspx
by motomech
Dec 22, 2017 4:53 pm
Forum: E-Bike General Discussion
Topic: New Luna geared Mac motor
Replies: 15
Views: 711

Re: New Luna geared Mac motor

Nice and simple, but............
I.M.O., too powerful for a frt. mount.
Too limited whl. size and motor speed options.
And where are the left-hand throttles?
by motomech
Dec 22, 2017 2:11 pm
Forum: Battery Technology
Topic: Multistar charger
Replies: 18
Views: 619

Re: Multistar charger

That is what the Battery Medics are for, to check and balance. They are low-tech, passive dis-chargers that bring all cells down to a set value. They are slow and only handle 6S each, but..... With a big pack that does not have the serial connection "broken" and is not discharged too low. 95% of the...
by motomech
Dec 21, 2017 6:25 pm
Forum: E-Bike General Discussion
Topic: Convert 29er wheel to 26"
Replies: 10
Views: 413

Re: Convert 29er wheel to 26"

I went from 26" wheels to 24' and pedal strikes were a problem.
I had to change to a crank to one with the shortest crank arms I could find.
Also had to install "thin" pedals.
by motomech
Dec 21, 2017 6:20 pm
Forum: Battery Technology
Topic: Multistar charger
Replies: 18
Views: 619

Re: Multistar charger

I would like not to have to dismantle the batteries to charge
That is what "Bulk Charge" means and why we recommend Mean Wells with a top charge in the 50's V range.
Good luck.
by motomech
Dec 21, 2017 2:02 pm
Forum: Battery Technology
Topic: Multistar charger
Replies: 18
Views: 619

Re: Multistar charger

Hello everyone . Excuse me for my English. I'm building a motorcycle and I need help with batteries. I'm using an m0909 engine and a 36-48v 300a driver I want to ride a battery multistar 6s 20a a pack of 12s 60a I would like to know what is the best way to do it for the download I thought to use an...
by motomech
Dec 21, 2017 4:53 am
Forum: E-Bike General Discussion
Topic: Panniers, trailers, and other cargo solutions
Replies: 188
Views: 9774

Re: Panniers, trailers, and other cargo solutions

I don't how you guys mount those axle mount trailers. W/ dual torque arms and a L-bracket from Ebike CA that protects the wire/exit area , my axle space is full up.
That's why I went w/ a seat post mount.
by motomech
Dec 19, 2017 5:42 pm
Forum: E-Bike General Discussion
Topic: My DIY HD Travoy. (bike trailer)
Replies: 19
Views: 1251

Re: My DIY HD Travoy. (bike trailer)

Since this general subject came up, I thought I would update this post. The trailer still works great and the only problem I have had was w/ the original tires. They were hard as a rock, super smelly and one went flat right away, so I replaced them These were on sale when I bought them and rather th...
by motomech
Dec 17, 2017 9:21 pm
Forum: E-Bike General Discussion
Topic: Snapped fork dropouts
Replies: 29
Views: 740

Re: Snapped fork dropouts

adamsavage79 wrote:
Dec 17, 2017 5:34 pm
Ok ? That's for the rear.. I have a front wheel motor....
It's for wherever it works.
by motomech
Dec 17, 2017 5:19 pm
Forum: E-Bike General Discussion
Topic: Snapped fork dropouts
Replies: 29
Views: 740

Re: Snapped fork dropouts

http://www.ebikes.ca/shop/electric-bicy ... rm-v4.html
613_2_.jpg
613_2_.jpg (72.09 KiB) Viewed 327 times
by motomech
Dec 17, 2017 5:07 pm
Forum: E-Bike General Discussion
Topic: mxus 250w
Replies: 4
Views: 216

Re: mxus 250w

The primary determinate of a system's top speed is battery Volts. The analogy of an electric vehicle to a gas one quickly breaks down when examined but, on the surface can be illistrative. Volts-Horsepower Amps-Torque Motor-The motor/Volts relationship is interdependent, and to some extent, it has a...