Search found 291 matches

by Comrade
Sep 22 2022 6:52am
Forum: EBike Troubleshooting
Topic: LCD8S and KT48SVPRK sine wave controller.
Replies: 18
Views: 372

Re: LCD8S and KT48SVPRK sine wave controller.

amberwolf wrote:
Sep 21 2022 9:58pm
Or if it uses switching (SMPS) technology, and there is insufficient filtering (capacitors) on input
Or maybe it's very sufficient and there is large inrush current at initial startup. :mrgreen:
by Comrade
Sep 21 2022 11:50am
Forum: EBike Technical
Topic: More connections bad?
Replies: 7
Views: 130

Re: More connections bad?

You won't be able to measure a difference between a solid wire and a properly soldered extension. You certainly won't be able to notice it with any human senses. Connectors oxidize and deteriorate after repeated use or constant shaking. The less connectors the better.
by Comrade
Sep 21 2022 10:34am
Forum: EBike General Discussion
Topic: what multimetre should i choose for present cell mesurement and future home task
Replies: 28
Views: 502

Re: what multimetre should i choose for present cell mesurement and future home task

the fluke are very expensive They are relatively more expensive, but total cost of ownership is a thing. Initial price is far from the total cost. How long before you need to replace thin cheap leads? How long do the batteries last? What is the probability of it breaking in a non repairable way div...
by Comrade
Sep 19 2022 9:38am
Forum: EBike General Discussion
Topic: what multimetre should i choose for present cell mesurement and future home task
Replies: 28
Views: 502

Re: what multimetre should i choose for present cell mesurement and future home task

You likely aren't going to be measuring amps, and if you do, amp draw on a bike is going to be much larger than most any meter, so you'd probably use a shunt and actually measure voltage across it. Most good meters go up to 10A, which is plenty to do some calibration on an e-bike. At 48v that's 480...
by Comrade
Sep 19 2022 7:04am
Forum: EBike General Discussion
Topic: what multimetre should i choose for present cell mesurement and future home task
Replies: 28
Views: 502

Re: what multimetre should i choose for present cell mesurement and future home task

sharinginfos wrote:
Sep 19 2022 12:24am
I like to make a good buy when i do a buying
None of those are a good meter by any definition.
by Comrade
Sep 17 2022 9:26am
Forum: EBike Troubleshooting
Topic: Further ideas about no power to motor?
Replies: 9
Views: 205

Re: Further ideas about no power to motor?

That's a Kunteng controller. First thing I did to mine before installing it is pouring some epoxy under the capacitors. They were not even tight on the board, just flapping side to side on their leads. That's not acceptable in any way for something that would be shaken and tossed, like an electric b...
by Comrade
Sep 16 2022 9:49pm
Forum: EBike Troubleshooting
Topic: LCD8S and KT48SVPRK sine wave controller.
Replies: 18
Views: 372

Re: LCD8S and KT48SVPRK sine wave controller.

I don't see why that would prevent it from working off the bat as 48v controllers are typically ran with 63v capacitors which is precisely what I have. Did you read my link? The resistor + LM317T is a linear regulator network. The higher the battery voltage, the more power that regulator network ha...
by Comrade
Sep 16 2022 7:50am
Forum: EBike Troubleshooting
Topic: LCD8S and KT48SVPRK sine wave controller.
Replies: 18
Views: 372

Re: LCD8S and KT48SVPRK sine wave controller.

https://endless-sphere.com/forums/viewtopic.php?f=2&t=114482&p=1692939&hilit=temperature#p1692939 Your controller is 36-48v? Well, then it was designed for 13S max. And by designed, I mean that's the absolute max under ideal conditions without being pushed. It's a typical no name Chinese...
by Comrade
Sep 14 2022 9:17am
Forum: EBike Troubleshooting
Topic: Battery early discharge cuttoff.
Replies: 23
Views: 710

Re: Battery early discharge cuttoff.

john61ct wrote:
Sep 13 2022 8:27pm
do not use voltage to guesstimate SoC
How else do you tell SoC if not for settled voltage?
by Comrade
Sep 13 2022 2:42pm
Forum: EBike Troubleshooting
Topic: Battery early discharge cuttoff.
Replies: 23
Views: 710

Re: Battery early discharge cuttoff.

john61ct wrote:
Sep 13 2022 10:33am
Given all that above, C
Why C if you've said midpoint is best, but C is shifted -0.1v from midpoint?
by Comrade
Sep 13 2022 8:51am
Forum: EBike Troubleshooting
Topic: Battery early discharge cuttoff.
Replies: 23
Views: 710

Re: Battery early discharge cuttoff.

ebuilder wrote:
Sep 12 2022 11:29am
As far away as from upper charge limit and lower discharge limit as possible.
So if nominal voltage is considered to be the middle of the charging range, where the charge level is by definition 50%, then (A) from the multiple choice? Is there a community consensus? :mrgreen:
by Comrade
Sep 12 2022 10:52am
Forum: EBike Troubleshooting
Topic: Battery early discharge cuttoff.
Replies: 23
Views: 710

Re: Battery early discharge cuttoff.

Also, if you are drawing down anywhere near 3Vpc isolated at rest you will not get good lifespan even out of the best li-ion cells. Should a battery be used around it's nominal voltage? Say it's 3.6V nominal, and the rider uses 0.8v per cell. Of these 3 options, which is the most optimal regiment f...
by Comrade
Sep 11 2022 9:40am
Forum: EBike General Discussion
Topic: Kunteng KT LCD-8 display C5 setting
Replies: 1
Views: 188

Kunteng KT LCD-8 display C5 setting

I can't figure out what 00, 01 and 02 settings actually do. I tried them on the bike, but don't really notice a difference between any of them. Does 00 mean that power will be ramped up to maximum in 3 step? Doesn't make any sense why it would be designed with steps since the controller could have d...
by Comrade
Sep 09 2022 9:09am
Forum: EBike Technical
Topic: Bike Range - DD VS. Geared Hub
Replies: 25
Views: 482

Re: Bike Range - DD VS. Geared Hub

LewTwo wrote:
Sep 08 2022 12:01am
As regards noise: plastic beveled gears are quieter than metal straight cut gears.
I think the marketing term is "helical gears". If one is to search for specifically that type of quiet motor.
by Comrade
Sep 09 2022 8:59am
Forum: EBike Troubleshooting
Topic: Help fault-tracing burnt resistor
Replies: 6
Views: 267

Re: Help fault-tracing burnt resistor

The more current that LVPS has to supply to stuff on the bike, the more current it will draw thru that resistor, and the more heat the resistor will create. So if you're running anything other than motor halls, PAS sensor, and throttle off the 5v from the controller, it might overheat the resistor....
by Comrade
Sep 09 2022 8:46am
Forum: EBike General Discussion
Topic: How to stop creaky spokes
Replies: 15
Views: 477

Re: How to stop creaky spokes

Yup, good point. Hadn't thought of that. The one I use (a cheapie) needs maybe 3-3.5" to fasten. When I calibrated mine it was wildly inaccurate out of the box. The Park Tool one is identical visually but 3 times more expensive. I suspect some of that premium went toward an actual calibration.
by Comrade
Sep 01 2022 7:52am
Forum: EBike General Discussion
Topic: CAN THIS BE USED AS LOAD RESISTOR
Replies: 8
Views: 360

Re: CAN THIS BE USED AS LOAD RESISTOR

99t4 wrote:
Aug 31 2022 3:27pm
Is it as simple as connecting the plug prongs to the batt + and - ?
If you have to ask, I would not recommend trying this. A tea kettle would work also. Any high power purely resistive home appliance could be a dummy load.
by Comrade
Aug 31 2022 3:24pm
Forum: EBike General Discussion
Topic: CAN THIS BE USED AS LOAD RESISTOR
Replies: 8
Views: 360

Re: CAN THIS BE USED AS LOAD RESISTOR

I'd put that up on Ebay as they fetch about $60-70, and use a regular resistive AC space heater, which you probably already own.
by Comrade
Aug 27 2022 9:58am
Forum: EBike Troubleshooting
Topic: Stripped axle nut
Replies: 11
Views: 323

Re: Stripped axle nut

e.mote wrote:
Aug 27 2022 7:16am
the spacers pushed on the axle nut in the picture
That's a locking nut in the picture.

There should have been a thick washer somewhere to prevent what happened.
by Comrade
Aug 23 2022 1:33pm
Forum: EBike Technical
Topic: Odd Battery behavior
Replies: 11
Views: 257

Re: Odd Battery behavior

Who said it was ever 10ah? The no name made in China label? :lol:
by Comrade
Aug 20 2022 8:26pm
Forum: Bike Mechanical & Structural
Topic: Should derailleur protector be installed on an e-bike?
Replies: 9
Views: 457

Re: Should derailleur protector be installed on an e-bike?

ColinB wrote:
Aug 19 2022 3:28pm
You want to protect your derailleur hanger. It'll either damage the frame, or cost $$$
Am I missing something or does this cage not hang on the derailleur hanger but on the axle? Which should be very beefy in an electric hub motor.
by Comrade
Aug 13 2022 4:12pm
Forum: EBike Troubleshooting
Topic: kunteng controller help with cfw needed!
Replies: 9
Views: 291

Re: kunteng controller help with cfw needed!

Bad idea to install software/firmware that is not in active development, had a tiny developer base and a tiny user base. Unless you saved a dump of your original firmware, you can either spend a lot of time on this and then buy a new controller. Or you can buy a new controller. :lol:
by Comrade
Aug 13 2022 12:35pm
Forum: EBike Technical
Topic: More KT LCD8H display problems
Replies: 10
Views: 316

Re: More KT LCD8H display problems

The next day with the battery about half discharged, I changed some of the settings on the display. When I turned the system back on on, the battery symbol on the display showed 4 green LEDs, even though the voltage still showed about 42v. There is a micro controller inside the LCD8 which has a bun...
by Comrade
Aug 13 2022 10:25am
Forum: EBike Technical
Topic: More KT LCD8H display problems
Replies: 10
Views: 316

Re: More KT LCD8H display problems

I have an LCD8 and tested what it shows at different voltages against a calibrated Fluke. So for the display to show 35V, 35.24V was needed. It's reading low throughout the range. Voltage Accuracy Test Target Volts Input Difference 20 20.28 0.280000000000001 25 25.24 0.239999999999998 30 30.32 0.32 ...
by Comrade
Aug 10 2022 4:13pm
Forum: Bike Mechanical & Structural
Topic: absolutely ridiculous ebike
Replies: 10
Views: 856

Re: absolutely ridiculous ebike

None wrote:
Aug 10 2022 4:03pm
As if you know anything about it?

How many miles have you ridden with a car tire to be able to tell about about the experience?
My comment was more about the engineering and the craftsmanship that was displayed in the video. :lol: