Old Giant struggles with hill.

[jarnold]

It doesn't seem like a long/steep/high enough hill to trigger low voltage cutoff or thermal cutoff, no brake switches to go wrong, cadence sensor working fine, I can't see an answer from afar!

I know, weird? It's probably just user error. I'll get out there again, stay in low gear and make sure I pedal constantly to the top. The problem is that cars keep driving up and down and I don't have the confidence I had 5 or 10 years ago. And the potholes...

 

[jarnold]

How fast is the bike moving at cut out.

Once again, I don't really know, there's too much going on at once.

 

[jarnold]

Alternatively, I could jury rig a throttle, just for experimental purposes, but that's not my aim.

 

[Peter.Bridge]

I would also be interested in the "no load" speed (with the motor wheel lifted off the ground). I suspect this might be too high for strong hill climbing although the controller shunt mod will definitely help

 

[jarnold]

I would also be interested in the "no load" speed (with the motor wheel lifted off the ground). I suspect this might be too high for strong hill climbing although the controller shunt mod will definitely help

Hard to say, without moving the spoke magnet sensor to the front(driven) wheel.

 

[Peter.Bridge]

Did you try the bike using a lower assist level on that hill ?

 

[jarnold]

Only just got back to this - had to clad our new oak framed garage, supervise the slate roof and all manner of other things. Played around in our paddock today, and I now totally understand what you've all been saying about speed based rather than power based. It doesn't really feel like pedal assist, it feels like pedal a revolution or something, motor tries to achieve a fixed speed, stop pedalling and after a (too long for my liking) delay, motor cuts out. All the ebikes I've ridden before feel more like I have bionic legs, which is what I'm after. So I guess I'm going to throw some more cash at the problem and buy a KT controller and compatible display.
Found this on eBay, any thoughts?

Pardon our interruption...

 

[Peter.Bridge]

I think 30a would be too much, 20a here

KT kunteng Electric Bicycle Motor ebike Controller 24V 36V 48V 250W 500W 1000W Brushless DC Sine Wave sensor Controller

KT kunteng Electric Bicycle Motor ebike Controller 24V 36V 48V 250W 500W 1000W Brushless DC Sine Wave sensor Controller

www.pswpower.com

 

[saneagle]

Only just got back to this - had to clad our new oak framed garage, supervise the slate roof and all manner of other things. Played around in our paddock today, and I now totally understand what you've all been saying about speed based rather than power based. It doesn't really feel like pedal assist, it feels like pedal a revolution or something, motor tries to achieve a fixed speed, stop pedalling and after a (too long for my liking) delay, motor cuts out. All the ebikes I've ridden before feel more like I have bionic legs, which is what I'm after. So I guess I'm going to throw some more cash at the problem and buy a KT controller and compatible display.
Found this on eBay, any thoughts?

Pardon our interruption...

Can you remind us which battery and motor you have? Are you currently running with 36v or still on 24v?

 

[jarnold]

Giant sync drive front hub motor, 36v 10.5ah battery from Yosepower..

 

[saneagle]

Giant sync drive front hub motor, 36v 10.5ah battery from Yosepower..

OK, 15A is about as high as you can safely go, so get the PSWPower one. It would be best to get the type with block connectors, not the moulded waterproof ones because you might need to re-arrange the motor connections, which is impossible with the moulded type.

 

[jarnold]

OK, 15A is about as high as you can safely go, so get the PSWPower one. It would be best to get the type with block connectors, not the moulded waterproof ones because you might need to re-arrange the motor connections, which is impossible with the moulded type.

Thanks. I'm having a lot of trouble with that website, it's hard to tell what I'm actually selecting. Reminds me of AliExpress, where you think you've ordered a pair of shoes, but it turns out you've only bought the laces...

 

[guerney]

Yes it's weird, they really should fix that website. If you are having difficulty adding stuff to your shopping cart: deselect everything, select UK delivery, then select your kit options, and "China" for "Ships from".

 

[jarnold]

Thanks. I'm having a lot of trouble with that website, it's hard to tell what I'm actually selecting. Reminds me of AliExpress, where you think you've ordered a pair of shoes, but it turns out you've only bought the laces...

They show 3 pictures of controllers, but no description of which one they are... Do you suppose the LCD comes with a cable? And what is the optional cable I can order? Very confusing, but good cheap price! Any help gratefully received!

 

[saneagle]

They show 3 pictures of controllers, but no description of which one they are... Do you suppose the LCD comes with a cable? And what is the optional cable I can order? Very confusing, but good cheap price! Any help gratefully received!

24V/36V 250W 36V/48V 500W 36V/48V 1000W~1500W Brushless DC Torque Simulation Square ebike Electric Bicycle Hub Motor Controller

24V/36V 250W 36V/48V 500W 36V/48V 1000W~1500W Brushless DC Torque Simulation Square ebike Electric Bicycle Hub Motor Controller

www.pswpower.com

Select the first option, which says 24v/36v 15A, then select all the other stuff to go with it.

 

[saneagle]

If the above doesn't work, you can always get one from Topbikekit. Add the LCD, throttle 8PAS and a speed sensor if you don't already have one.

T06S 24V/36V-36V/48V250W 15A KT Sine Wave Brushless Controller for Ebike FT-06 36V250W Torque Simulation Square Wave Controller Brushless Controller for Ebike [T06S controller] - $24.00 : Zen Cart!, The Art of E-commerce

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topbikekit.com

 

[guerney]

They show 3 pictures of controllers, but no description of which one they are...

This is how it looks on PC, I don't know how t looks on Android, iDevice etc... they've got controller descriptions in the "Alt" tag of the images, which only appear when you hover over them with your mouse pointer, and what you've selected for "SKU" only appears above after you've selected an image.

 

[jarnold]

This is what I ended up ordering, after moving to a desktop and much agro.
KT kunteng Electric Bicycle Motor ebike Controller 24V 36V 48V 250W 500W 1000W Brushless DC Sine Wave sensor Controller
My hub motor has totally different connectors for phases and hall sensors, so I guess I'll need to do more cutting and soldering, unless there's some sort of nifty breakout cable available...
Thanks for all the help/advice, and hope I haven't bought the wrong kit!

 

[Cadence]

I tried to buy a battery using PSW's website, and managed to navigate to the checkout where there was a message to the effect that "we cannot ship to the UK". I fired off a disgruntled email asking if that is the case, why do you list it in UK pounds?. I got a very quick and polite reply with a PayPal invoice which included a small extra shipping cost. It was about £20 less than their eBay listing and I didn't have to pay any extra on receipt. The only slight annoyance is that this was 2 weeks ago and since then they've dropped the website price by another £20.00!
I have had good responses previously when asking some details about their KT controllers, so I have no complaints other than their website being hard to navigate.

 

[jarnold]

You've all been very helpful so far, thanks.
Re. Cabling: I'm competent with a soldering iron etc., so while I don't mind too much about cutting and splicing cables for PAS etc., I'd prefer to leave the 9 way Julet motor connector as is, so looking for a mating cable. I seem to be able to find plenty, but they're only 600mm long, which won't reach from the controller, which is between the seat down tube and the rear mudguard, to the front hub. Any idea where I might find a longer cable, without breaking the bank?
Also, I'm hoping that the LCD5 display I ordered comes complete with cable, but it's hard to tell from that Pswpower web site.