Search found 34517 matches

by dogman dan
Aug 18 2019 8:35am
Forum: E-Bike General Discussion
Topic: Front suspension forks question
Replies: 35
Views: 594

Re: Front suspension forks question

You might want to hunt down an ancient thread of mine where I build a 50 mph bike for a race, using a front hub. look for the keyword death race in the thread title. Summing it up, I started with a very good quality cromoly fork from a high price MTB. It was old, back to when MTB's did not have shoc...
by dogman dan
Aug 18 2019 8:28am
Forum: E-Bike General Discussion
Topic: Is this used cargo ebike worth the price?
Replies: 7
Views: 151

Re: Is this used cargo ebike worth the price?

Agree subtract battery price from original, then half price it if in very good condition. If well worn, then one third price. So $750 to a thou. Me. Id be trying to get it for 250, because Im just a cheap bastard. I'd be hoping the seller had no idea what it is worth. Really good bike, even if you s...
by dogman dan
Aug 14 2019 5:59am
Forum: E-Bike General Discussion
Topic: Largest capacity for battery packs??
Replies: 9
Views: 343

Re: Largest capacity for battery packs??

This problem is part of the design I chose when I built this frame. I wanted at least 20 ah of 18650's in the front triangle, and another behind the seat. And if needed, another 40 ah could be carried in the panniers. This frame was based on the classic mixte frame design, but with a wider spacing o...
by dogman dan
Aug 14 2019 5:41am
Forum: E-Bike General Discussion
Topic: Best front DD hub under 6KG for cargo load ?
Replies: 10
Views: 316

Re: Best front DD hub under 6KG for cargo load ?

Yeah, I get it that lighter would be better. But you said 150kg if that's you, the bike, the battery, the motor and the cargo, then the typical 9c type dd motor will do you just fine, particularly in 20" rim. I used the same motor as the trike kit in this bike, but a rear motor. 9c type motor from E...
by dogman dan
Aug 13 2019 6:45am
Forum: E-Bike General Discussion
Topic: can regen damage your hub motor?
Replies: 12
Views: 287

Re: can regen damage your hub motor?

The heating problem is that if you run the motor as a motor it heats it up. Then if you run it as a generator, that also makes heat. Makes cooling the thing down hard, if you just almost melted the motor on the way up. So like lots of questions, the answer is it depends. Regen won't fry your motor i...
by dogman dan
Aug 13 2019 6:29am
Forum: E-Bike General Discussion
Topic: Best front DD hub under 6KG for cargo load ?
Replies: 10
Views: 316

Re: Best front DD hub under 6KG for cargo load ?

You might try the trike kit front hub motor at Ebikekit. Its a slow motor, so it will tolerate the slow rpms common when hauling heavier loads, particularly up hills. It still won't haul unlimited loads up long steep hills, but does haul 400 pound loads up hills that are miles long with ease. The li...
by dogman dan
Aug 08 2019 7:17am
Forum: E-Bike Technical
Topic: Upgrading Prebuilt ebike to 48v or 52v?
Replies: 7
Views: 254

Re: Upgrading Prebuilt ebike to 48v or 52v?

Ten years ago, most 36v controllers could do 48v as well. But in your case, it may zorch something in the controller or the display, or simply kick in a protective circuit at about 45v, so it just won't turn on when you put 54v full charged 48v battery on it. The motor can take 48v, the wires need n...
by dogman dan
Aug 08 2019 7:13am
Forum: E-Bike Technical
Topic: Carbon fiber cranks: made sense in ebikes?
Replies: 6
Views: 236

Re: Carbon fiber cranks: made sense in ebikes?

They will improve how cool you are. But if you don't care about cool, save your money, or put em on a pedaler where weight does matter.
by dogman dan
Aug 08 2019 7:08am
Forum: E-Bike Technical
Topic: Strong hub motor vibration, although hall sensors seem to work
Replies: 4
Views: 160

Re: Strong hub motor vibration, although hall sensors seem to work

Hall sensors that don't toggle between 5v ( or whatever the input is) and 0v as they rotate are not working. But if the problem persists when running sensorless, then the problem is in the three power wires. Often when it runs smooth no load, and stutters with a load, its because one wire is connect...
by dogman dan
Aug 08 2019 6:44am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 200
Views: 4236

Re: Hub motor industry dying?

Always choose the tool that suits the job. For damn sure, the job is different for each rider, or even for each type of ride for one rider. In some cases, pick the wrong tool and you are screwed, like 29 inch wheel, 350w geared hub motor, and a trailer full of cargo up 8% grades. But since most ride...
by dogman dan
Aug 05 2019 7:06am
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 47
Views: 1946

Re: A portable gasoline generator for long range

So where are you? You did not fill in that info so it appears in each post. Just what continent will suffice. Maybe you said where someplace, but I don't see it in the first post. Again, its the number of miles I was riding that made it cost so much per mile to e bike commute. I went through a lot m...
by dogman dan
Aug 05 2019 6:44am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 200
Views: 4236

Re: Hub motor industry dying?

The aden looks interesting, but unlike mid drives cannot be shifted. The mid drive industry is clearly aimed at converting people who pedal. This is why the big bike industry guys went that way. They are after the big dollar bike rider segment of the market. They are accustomed to big prices on the ...
by dogman dan
Aug 05 2019 6:29am
Forum: Battery Technology
Topic: no name batteries
Replies: 3
Views: 186

Re: no name batteries

best you can, match resistance. Meaning toss any with a lot of resistance. Then group by capacity, and when making up cell groups, make each group the same capacity and same average resistance. This may mean putting two high capacity, and two medium cells in each 4s group. Toss low capacity cells to...
by dogman dan
Aug 05 2019 6:19am
Forum: Battery Technology
Topic: Charging 14s pack with 13s charger
Replies: 3
Views: 131

Re: Charging 14s pack with 13s charger

Balance at full charge, the 14s charger if your pack has a bms. Then to increase cell life, discharge again at least some right away. Its time full that damages more than a brief time full for balancing. At 3.9v, it won't balance near as accurately, even if you use a balancer you can set to that vol...
by dogman dan
Aug 05 2019 6:13am
Forum: Battery Technology
Topic: 10s charger measures 42.3v. Bad thing?
Replies: 7
Views: 200

Re: 10s charger measures 42.3v. Bad thing?

You are looking at a .03v overcharge per cell, assuming a perfect balance. I would not worry about it, possible that you are measuring with a tool not really accurate to .01v anyway. Another thing to consider, as chargers age, they typically start to put out lower voltage anyway. In any case, balanc...
by dogman dan
Aug 01 2019 6:04pm
Forum: E-Bike General Discussion
Topic: How much can a motor draw?
Replies: 14
Views: 411

Re: How much can a motor draw?

How much you might choose to let your motor draw is another question. Many typical e bike hub motors are rated 500w, but double that is not much of a risk of overheating, hence the 22 -30 amps controllers used. If allowed to cool enough between bursts, the typical 1000w kit motor can handle 3000w. T...
by dogman dan
Aug 01 2019 5:59pm
Forum: E-Bike General Discussion
Topic: 18% regeneration?
Replies: 25
Views: 521

Re: 18% regeneration?

Not retarded at all. I would have liked a less strong regen choice on the primitive controller I was using when I had regen. One reason I got so little out of regen was that it was so strong I used it only to stop. Going down hills it would slow me to 5 mph, and so was not worth using. That made my ...
by dogman dan
Aug 01 2019 9:50am
Forum: E-Bike General Discussion
Topic: 18% regeneration?
Replies: 25
Views: 521

Re: 18% regeneration?

Suspiciously high for sure. Not impossible if you start out on top of a mountain, but not realistic for up and down rolling hills at all.

Best I ever saw myself, was way below 5%
by dogman dan
Aug 01 2019 9:47am
Forum: E-Bike General Discussion
Topic: How much can a motor draw?
Replies: 14
Views: 411

Re: How much can a motor draw?

Exactly, in other words, if the motor don't turn, the load is infinite. Which means it makes heat instead of motion. The more you over load and slow down the motor, the motor it makes heat instead of motion. What keeps that in control, is the controller. Otherwise the motor would pull infinite watts...
by dogman dan
Aug 01 2019 9:39am
Forum: E-Bike General Discussion
Topic: Mac 8T Kit Motor Change
Replies: 8
Views: 228

Re: Mac 8T Kit Motor Change

FWIW, lots of folks call it a grinding noise, when a motor stutters. Stutter could be as simple as getting a better connection on motor wires, the fat ones or the slim. I'd open that motor and look at that clutch, before I call it a clutch issue and buy a new motor. It could also be something as sim...
by dogman dan
Aug 01 2019 9:30am
Forum: E-Bike General Discussion
Topic: No torque wrench...axle nut question
Replies: 30
Views: 734

Re: No torque wrench...axle nut question

Well, a torque wrench won't solve a really shitty axle, machined so poor and loose it has no chance. But a reasonable fit, I have not stripped one out by using a short handled adjustable wrench. One that is not as long as that size would be in a regular box wrench. About a six inch handle prevents m...
by dogman dan
Aug 01 2019 9:20am
Forum: E-Bike General Discussion
Topic: How to know the range of my bike?
Replies: 26
Views: 657

Re: How to know the range of my bike?

Back off hassling Amberwolf, you have no idea how many people he's helped, for more than a decade. To calculate your range, you need a lot of basic info. Otherwise you are just guessing. So that's why we won't tell you much, we hate guessing. You need the size of your battery in watt hours. That for...
by dogman dan
Aug 01 2019 9:06am
Forum: E-Bike Technical
Topic: Some help please
Replies: 7
Views: 199

Re: Some help please

Yes, you need to find the right combo of the three wires first. The old controller may have been match the colors, the new one you may need to swap green and yellow, or some other swap to make it run.
by dogman dan
Aug 01 2019 9:02am
Forum: E-Bike Technical
Topic: self learning wire
Replies: 1
Views: 111

Re: self learning wire

That's not normal, but I have no idea why. Once you beep the throttle with the self learn wire connected and the wheel goes forward, it should set itself and run fine. If it was something else, like your motor wire plugs are loose, it should not have run with the learn wire connected. But, since its...