Search found 104 matches

by Comrade
Nov 27 2021 11:26pm
Forum: EBike Technical
Topic: Wildly different battery readings
Replies: 1
Views: 25

Re: Wildly different battery readings

has a little power meter and it shows it still has 2/4 (50%) lights on That little power meter measures no load voltage. Under load your voltage drops below the preset. The higher the load the higher the drop. Cheap or bad batteries can't tolerate high loads so they sag. Ease off the throttle and i...
by Comrade
Nov 27 2021 7:33pm
Forum: EBike Technical
Topic: Battery pack from a prius cell
Replies: 5
Views: 81

Re: Battery pack from a prius cell

Like I mentioned earlier, these cells are designed to operate between 40% and 80% charge, ONLY . The hybrid system will not let them get outside that range. Ever. More realistically they live most of their life between 45%-65%. This is a narrow range, which might be the reason why balancing at cell ...
by Comrade
Nov 27 2021 5:32pm
Forum: EBike Technical
Topic: Battery pack from a prius cell
Replies: 5
Views: 81

Re: Battery pack from a prius cell

Each battery "cell" (which i think is what prius defines them as) contains 6 1.2v cells so in reality it will be 30s1p however you cant access the individual cells. If they are used, you might be getting 30-40% less than their original 6.5aH rating. At this point you might be better off b...
by Comrade
Nov 27 2021 4:58pm
Forum: EBike Technical
Topic: Battery pack from a prius cell
Replies: 5
Views: 81

Re: Battery pack from a prius cell

I plan on a 36v 5s1p configuration if its of any help. How exactly do five 1.2v nimh cells = 36v? Or you meant 5 whole modules? They are 7.2V @ 6.5aH @ 1kg. So a 13aH @ 36v battery would weigh 22 pounds at the minimum. So like 3 times heavier than a typical li-on bike battery? I own a hybrid that u...
by Comrade
Nov 27 2021 9:07am
Forum: EBike Technical
Topic: Contactor question
Replies: 12
Views: 172

Re: Contactor question

The FET based units at such high power use cases are just not as reliable robust, long-lived cheap Chinese versions even more unrealistically rated. I would love to be proven wrong. Are there any links to FET based units? I've never seen one. But, there is already a FET based "contactor" ...
by Comrade
Nov 26 2021 7:59pm
Forum: EBike Technical
Topic: Contactor question
Replies: 12
Views: 172

Re: Contactor question

So what is the benefit of mechanical (at the cost of several watt/h) vs. solid state?
by Comrade
Nov 26 2021 4:59pm
Forum: EBike Technical
Topic: Contactor question
Replies: 12
Views: 172

Re: Contactor question

john61ct wrote:
Nov 26 2021 4:23pm
Mechanical better than SS
Why :?:
by Comrade
Nov 25 2021 7:44pm
Forum: EBike Build Threads
Topic: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?
Replies: 39
Views: 794

Re: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?

I believe that my friend, is wishful thinking. If you show me a KT display successfully displaying a motor temp. THEN I'll believe you. I have a bench signal generator and I should be able to easily simulate this "multiplexed" signal to test it out. I'll return to my workbench in early De...
by Comrade
Nov 25 2021 4:58pm
Forum: EBike Build Threads
Topic: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?
Replies: 39
Views: 794

Re: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?

You're referring to the signal from the controller to the display. I'm referring to the signal from the motor to the controller. Put another way- Lets say you take the time and trouble to install a temp sensor in your motor. Kindly show me where you hook that temp sensor output to a KT controller s...
by Comrade
Nov 25 2021 4:36pm
Forum: EBike Troubleshooting
Topic: SW900 Won't Go Into Program Mode
Replies: 8
Views: 112

Re: SW900 Won't Go Into Program Mode

I read the manual where it says to hold both the up and down arrow buttons at the same time for a few seconds until it changes, but nothing happens I just read the manual for a KT-LCD8, and it explicitly says to press up+down within 5 seconds of powering on to get into settings. SW900 looks similar...
by Comrade
Nov 25 2021 1:32pm
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

E-HP wrote:
Nov 25 2021 12:02pm
I don't see any more vibration than if you had a slightly out of balance tire mounted on the wheel.
It's not the vibration I'm concerned about (at this point at least), it's the bending action that the motor would exert on my dropouts.
by Comrade
Nov 25 2021 10:22am
Forum: EBike Build Threads
Topic: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?
Replies: 39
Views: 794

Re: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?

Regarding the KT display potential to read motor temp, agree the displays are able to display it, but I've never seen anything anywhere on where or how that temp is input. There are no specific/dedicated wires for that purpose anywhere on the controller. The white wire coming from the motor is from...
by Comrade
Nov 25 2021 9:31am
Forum: EBike Build Threads
Topic: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?
Replies: 39
Views: 794

Re: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?

The CA is NOT a display. (just to make that absolutely clear to any readers now or in the future) It is not designed in any way to communicate with any controller in any way other than sending it a throttle signal. It can only display the information that is monitored or created within the CAv3 its...
by Comrade
Nov 25 2021 9:15am
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

E-HP wrote:
Nov 25 2021 3:01am
How's it look on the dropout on the other side of the wheel?
Other side looks much better. There is wobble, but based on the amplitude I think it is just transferred from the other side. That is if the cassette site didn't wobble, it would be running smooth on both sides.
by Comrade
Nov 23 2021 4:28pm
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

If the wheel rim is true it will not be bending the dropouts back and forth. That's the part I don't understand. If the bending comes from the axle mount point, which is somewhere around the base of the cassette mount, nothing except making the axle perfectly parallel to the axle on the other side ...
by Comrade
Nov 23 2021 2:21pm
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

Keep in mind that that is the wobble at the hub, not the rim. If, after the wheel is built up you still see that sort of wobble it's unacceptable. However that's not a given, especially if the wheel is hand built. I'm not sure I understand what you mean. It seems like you are saying what the AKM &q...
by Comrade
Nov 23 2021 12:32pm
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

I'll definitely do an autopsy if Top Bike Kit doesn't want this bum motor back. I doubt it though. These things must cost $30 coming from the factory. I would not expect Japanese bearing in these. :lol: But I have not had trouble with Chinese bearings in the past as long as they don't get abused wit...
by Comrade
Nov 23 2021 11:28am
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

yRbe4_CVrto I mounted the motor in a junk steel frame, to see what happens, and the motor has no problem bending the dropout back and forth. :( That's no good for sure. And here is the response from the seller. Hi Dear, Just check it with our engineer and AKM, they all said it is normal. Because yo...
by Comrade
Nov 23 2021 9:47am
Forum: EBike Build Threads
Topic: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?
Replies: 39
Views: 794

Re: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?

But as has also been stated, the CAv3 is not just designed for Grin controllers, nor v/v. CA works with any controller, including KTs It might work with other controllers, but it does not appear that it will program controllers, since say KT uses a proprietary protocol. So if someone buys a KT cont...
by Comrade
Nov 20 2021 10:44pm
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

Trying to think what would cause it to wobble side to side like that. Without 3D video, zooming in would not help showing how it wobbles. It's actually as if the axle is moving in a circular motion. The axle is fixed in space at the nut position, but is moving in a circle in space where it enters t...
by Comrade
Nov 20 2021 3:30pm
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

Is there a good mechanical drawing of the internals of a typical geared hub motor available somewhere?

Still trying to wrap my mind where the defect in the motor might be.
by Comrade
Nov 20 2021 1:33pm
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

What recourse you have with the seller is an open question I have the power of $300B+ Mastercard Inc. on my side. :lol: If I get a new motor, what tolerances would be acceptable? Visibly no wobble at the minimum? I bought cheap Chinese things plenty time before, but have no baseline of what to expe...
by Comrade
Nov 20 2021 12:12pm
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Re: Does my brand new hub motor have a bent axle? (4K video)

Chalo wrote:
Nov 20 2021 12:01pm
Working back and forth like that is likely to break your axle and/or your dropout welds eventually.
So +1 vote from you that this is completely unacceptable and should not have passed QC? :mrgreen:
by Comrade
Nov 20 2021 11:32am
Forum: EBike General Discussion
Topic: Does my brand new hub motor have a bent axle? (4K video)
Replies: 29
Views: 499

Does my brand new hub motor have a bent axle? (4K video)

So I made a really sturdy bench motor mount out of a 2x4 clamped to the workbench, and plywood sides that are glued down and screwed down. And I noticed that there is a very visible wobble that it seems the axle is introducing. I have never owned bike motors before, but this does not seem like an ac...
by Comrade
Nov 20 2021 7:49am
Forum: EBike General Discussion
Topic: current selection of rear geared cassette hubs
Replies: 34
Views: 827

Re: current selection of rear geared cassette hubs

20" vs 26" vs 29"(700C) will change the speed for the same voltage. 20" being slower then 29" Yes, it will change the speed of travel relative to ground, but it won't change the RPM. :lol: I'm confused why they specify "20inch" next to the RPM rating of the motor....