Search found 48 matches

by jonathan75
May 05 2019 1:42pm
Forum: E-Bike Technical
Topic: Bafang 180mm (7 inch) CST grinding noise+total loss of power
Replies: 6
Views: 787

Re: Bafang 180mm (7 inch) CST grinding noise+total loss of power

Can't seem to get some of the screws out - even a sharp new philips-head bit seems to just damage the grooves on the screws. Would anyone have any tips on this please? Image: https://photos.app.goo.gl/UFccE8zeHDXQb3P49
by jonathan75
Mar 10 2019 8:40am
Forum: E-Bike Technical
Topic: Bafang 180mm (7 inch) CST grinding noise+total loss of power
Replies: 6
Views: 787

Re: Bafang 180mm (7 inch) CST grinding noise+total loss of p

Thanks Dan. After a year or two’s law exams I’ve found time to start work on this again (!) I used a purpose-built motor/controller tester and it was identifying *multiple* problems with the motor (I can't remember what they were but it wasn't good). With professional help on the battery front I rul...
by jonathan75
Sep 02 2017 7:46am
Forum: E-Bike Technical
Topic: Bafang 180mm (7 inch) CST grinding noise+total loss of power
Replies: 6
Views: 787

Re: Bafang 180mm (7 inch) CST grinding noise+total loss of p

Which thing seemed to fix it most often? Wiggling things? Or power cycling? Etc? ... But batteries are another cause of stops like you get, ... The latter type of failure would also tend to get worse over time in the way that you describe. All of your message was really helpful - thanks. Power cycl...
by jonathan75
Sep 01 2017 6:44pm
Forum: E-Bike Technical
Topic: Bafang 180mm (7 inch) CST grinding noise+total loss of power
Replies: 6
Views: 787

Bafang 180mm (7 inch) CST grinding noise+total loss of power

Hi all, My Bafang CST (180mm variety) with 15a no-brand controller setup, unfortunately after 600 miles of intermittent losses of power and (M) (motor error) messages on the LCD-861 display, recently made a lot of sad grinding/vibrating/ noises, followed by a total loss of power after a few seconds,...
by jonathan75
Sep 03 2015 9:33pm
Forum: E-Bike Technical
Topic: Linear Inner Tube
Replies: 7
Views: 1936

Re: Linear Inner Tube

Has anyone used this type of linear inner tube for repairing flats on the road yet? I know the ones that hooked over the valve stem have been around for several years and I have used them, but they seem to make a heavy spot on the wheel. Some riders call them "Thumpers". This design seems much bett...
by jonathan75
Aug 23 2015 7:55am
Forum: E-Bike Technical
Topic: Occasional "motor stoppage" fault on 'LCD 861' -Bafang CST
Replies: 2
Views: 537

Occasional "motor stoppage" fault on 'LCD 861' -Bafang CST

Ever since I first completed this build, I've received an occasional "motor stoppage" fault code on my 'LCD 861' display, which is mated with a 250-350w 6 fet minicontroller, and a Bafang CST 350w 270rpm (images below), run until recently at 36v. 400 miles on it from new. When it happens there is so...
by jonathan75
Aug 20 2015 8:06am
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

It's not really practical unless you have controllers and displays that are automatic dual voltage. Even then, they can get a bit mixed up if you change fom 36v to 48v. It seems that they have some sort of memory so that they can deal with the difference between a disharged 48v battery (38v) and a ...
by jonathan75
Aug 20 2015 8:02am
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

...The other way is to use an accurate wattmeter so you can keep tabs on the battery and turn for home before it gets too low. I would even suggest purposely riding until the pack is fully drained one time so you can get the capacity data for it. That will give you confidence on subsequent rides. -...
by jonathan75
Aug 17 2015 8:38am
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

I can't access the picture. That difference between Vrest and Vmin is of course not correct. My logs indicate an internal resistance of 0.184 ohms for a voltage sag of 0.184V per Amp or just over 4.0V at 22A peak load. This relationship holds until almost 90% capacity has been used. There are quite...
by jonathan75
Aug 15 2015 9:43pm
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

I'm using one of these https://drive.google.com/open?id=0B7ym9WvyF_P7ZTVpRG9uNE5SMWs It's wierd but the Vmin was only 0.5v below Vrest at the end of the ride. Maybe I viewed it wrong, will try again tomorrow. Really appreciate your other advice just now. The 48v is a bit of a revelation on hills. Al...
by jonathan75
Aug 15 2015 7:56pm
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

-R Thanks Russell - after reading your post I opened up the 36v 18a minicontroller and it turned out it does have 63v main capacitors. Just been on a 20-mile run, first run with the new 48v battery, charged fully. Worked very well. Ate up the hills. Is your 11.6ah battery still going OK? I think th...
by jonathan75
Aug 15 2015 9:11am
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

It's not really practical unless you have controllers and displays that are automatic dual voltage. Even then, they can get a bit mixed up if you change fom 36v to 48v. It seems that they have some sort of memory so that they can deal with the difference between a disharged 48v battery (38v) and a ...
by jonathan75
Aug 14 2015 7:11pm
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

d8veh wrote:I don't understand what you want to achieve.
Apologies, that wasn't very clear of me. I'd like to carry and use on my bike alternately on a given tour, both batteries I now own, a 36v and 48v. So I'd like to be able to switch over from one to the other when one runs low.
by jonathan75
Aug 13 2015 7:13am
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

You could use a 48v motor with the 36v controller. It'll be very slow though, at about 15 mph max. In high gear and 8 mph in low gear. Thank you. 15 is perfect actually - could the 36v controller run off the same lcd unit as the 48, so that I could unplug and replug when swapping 36v and 48v batter...
by jonathan75
Aug 12 2015 11:15am
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

I would call the Xiongda a small motor. The 48v version is like a winch when it comes to hill-climbing. Slightly off-topic of me but will the 48v Xiongda work with a 36v battery? I realise there will be a low voltage cutoff issue but can that be overcome through altering the 48v/36v setting in the ...
by jonathan75
Aug 11 2015 5:57pm
Forum: E-Bike Reviews & Testing
Topic: BMSBATTERY PROBLEMS???
Replies: 205
Views: 10510

BMSBattery extra shipping cost invalidates PayPal protection

I just wanted to point out to fellow ebikers that paying for any purchase on PayPal in more than one transaction, in theory invalidates your PayPal buyer protection. It's been pointed out to me by a fellow biker that PayPal wouldn't know about the extra transactions being connected with the first pu...
by jonathan75
Aug 10 2015 11:16am
Forum: E-Bike Technical
Topic: soldering shunt
Replies: 32
Views: 4141

Re: soldering shunt

Thank you for that D8veh, that makes sense - the controller seems to be just about coping with things. Would it be OK to run that 36v controller I've modded with the added resistor, at 48v, provided I reduce the amperage through the LCD display amp reduction option, say to 12 or 13a? I'm hoping to b...
by jonathan75
Aug 02 2015 4:32pm
Forum: E-Bike Technical
Topic: soldering shunt
Replies: 32
Views: 4141

Re: soldering shunt

Soldering on a resistor worked well, the bike has much more kick. It's measuring 18.3a max instead of 15, and goes up hills considerably better on throttle alone, and using power levels in the middle of the display's range. The controller was moderately-quite hot when I got home.
by jonathan75
Aug 01 2015 3:58am
Forum: E-Bike General Discussion
Topic: Cyclist vs motorist
Replies: 21
Views: 2305

Re: Cyclist vs motorist

Yes so it may be the cyclist suffers from grievance sensitivity /querulousness,and behaves inappropriately, but I don't think that means he didn't have a proper grievance, and as for winding up the motorist, (without having seen that bit) what I suspect wound the motorist up most was the latter's (i...
by jonathan75
Jul 30 2015 2:11pm
Forum: E-Vehicles General Discussion
Topic: EM drive; "new class of electrical machine"
Replies: 15
Views: 2632

Re: EM drive; "new class of electrical machine"

As a physics ignoramus, my common sense nevertheless tells me the quantities of energy produced, if produced, would massively exceed - by a tremendous factor - the capability of the components to withstand contact with them. So the energy wouldn't be produced.
by jonathan75
Jul 30 2015 2:03pm
Forum: E-Bike General Discussion
Topic: EBike Insurance
Replies: 4
Views: 559

Re: EBike Insurance

Here in the UK it costs about 6-8% of the value of the bike per annum, through a specialist insurer, however, sometimes ebikers on the UK pedelecs webforum have indeed got an extension to their home insurance to cover the ebike out and about, for very little like $20US. However. Those policies will ...
by jonathan75
Jul 28 2015 7:31am
Forum: E-Bike General Discussion
Topic: KU93 with Bafang CST 250w (350w) inadequate for hills
Replies: 30
Views: 3775

Re: KU93 with Bafang CST 250w (350w) inadequate for hills

So in short; make sure your KU93 is running at normal speed instead of the default middle setting and try soldering up the shunt for a few more amps. The best thing you could do however is switch to 48V, it makes a huge difference. -R Thanks Russell. Does the follow scenario sound like likely overh...
by jonathan75
Jul 26 2015 2:20pm
Forum: E-Bike Technical
Topic: Bmsbattery 09 bottle batteries featuring 32A Samsung cells w
Replies: 1
Views: 319

Bmsbattery 09 bottle batteries featuring 32A Samsung cells w

"...withdrawn ",it was meant to say. Does anyone know why? I've an order waiting to be processed and all of the new 36v16ah and 48v12.8ah batteries have been withdrawn from sale suddenly. Also- 2)Are they unreliable? 3) are (the only alternative they're selling) Panasonic 2.9ah NCR18650PF cells any ...
by jonathan75
Jul 22 2015 8:00pm
Forum: E-Bike General Discussion
Topic: Are BMSB's cheapo 36v 12.5ah no-brand batteries any good?
Replies: 2
Views: 495

Re: Are BMSB's cheapo 36v 12.5ah no-brand batteries any good

motomech wrote:I have one of the generic "dolphin" style batteries and it's had some problems.
The Samsung cells are deffinately worth the extra money.
Thanks. I worried as much. Gone for the Samsung now.