Throttle LED always at min

[allotmenteer]

I know that the LEDs that (supposedly) show the charge level of the battery are not exactly accurate but my LED is always on min even when I have just fully charged my li-ion battery to 29V. Does anyone else have this problem? Perhaps I have wired the throttle up wrong (unlikely though as everything works just fine).

Can anyone help?

Paul

 

[flecc]

Which bike is this Paul? Also, is it still only on red when standing still with the throttle shut off?

 

[Flying Kiwi]

my LED is always on min even when I have just fully charged my li-ion battery to 29V.

It sounds like something where you're supposed to make an adjustment, perhaps with a trim pot or 2 - I know that was the case when I installed a fuel guage on my CNG powered car many years ago in NZ. I needed to adjust an upper and lower trim pot and only then the guage worked fine.
What bike is this with? Is it a self installed motor kit if not, why have you needed to wire up a throttle? Has this only been a problem since you made changes? Sorry about the barrage of questions but I had a look at a couple of your past posts and couldn't find this.

 

[flecc]

Got it. I take it that it's this one Paul, extracted from a previous post of yours:

"I have recently purchased the 350W rear hub motor Kit from electricbikessales.co.uk. The kit has a 6.8 A/h li-ion battery (weighs 1.5 kg) The battery is 24V (reads 29V+ when fully charged)"

If so, it's difficult to be certain as I don't know the kit. Could Electricbikesales help perhaps? They may have crossed this before.

Otherwise I can offer this thought. 6.8 Ah is a very small Li-ion size for a nominal 350 watt motor, so it wouldn't surprise me if the meter dropped straight to red the moment the throttle was opened. For example, the eZee bikes with nominal 200/250 watt motors use 10 Ah Li-ions, and even they are very willing to drop into the red on the meter in adverse high drain conditions.

 

[Flying Kiwi]

Got it.

You're far more patient than me at looking through past posts As well as the voltage drop under load theory being a likely explanation if it happens after any throttle movement, the LED display may be designed to fit several different kits and need adjusting to suit the specific one it's paired with. I agree that the seller should be the authority on it assuming the kit instructions have already been reviewed...

Paul, you have thoroughly reviewed the manual/instructions haven't you (unlike my search through your past posts) Was there anything you were unsure of?

 

[flecc]

You're far more patient than me at looking through past posts

I had an unfair advantage as I'd previously looked up Paul's outfit. Although I couldn't remember exactly what it was, I did remember which thread I'd found it in before.

 

[allotmenteer]

Thanks for the quick replies. Sorry, I should have put more info on the post.

It is the 350W kit from electricbikesales. The LED always reads min right from when I connect the battery before I have even touched the throttle. When I totally exhaust the battery the LED is still on min but goes really dim.

As for an instruction manual, I did get a two page fitting instruction sheet with some photos. I wouldn't go so far as to call that a manual though. Still it was straightforward to fit.

I haven't actually contacted the electricbikesales about it yet as I'm not too worried as it doesn't affect the operation of the kit but it is just a minor annoyance.

When I get home I'll take a look at the wiring diagram I was given and then take a couple of pictures for everyone to look at.

I think maybe the throttle could be a generic one. Perhaps it is for a 36V system and thus at 29V is always on min.

Paul

 

[Flying Kiwi]

The LED always reads min right from when I connect the battery before I have even touched the throttle. When I totally exhaust the battery the LED is still on min but goes really dim.
.....
I think maybe the throttle could be a generic one. Perhaps it is for a 36V system and thus at 29V is always on min.

I suspect a mismatched LED Meter as even at minimum voltage (with the battery flat) it should still have the LED well illuminated. Have you checked the battery voltage in this state. It shouldn't be dropping below a safe minimum cell voltage or the cells may be damaged. I'm interested to know what the dealer says.

 

[allotmenteer]

Further details

As promised here are a few photos.

The throttle brand name is Wuxing. There are five stars above the word as well. The other markings on the throttle read LT25XK.

There are four wires from the throttle. The instructions said to run the yellow one to the red +ve from the battery, red to red from controller, green to green, and blue to yellow from controller.

As for the controller, does anyone read Chinese?

 

[allotmenteer]

Just an update on this thread.

I wired up a 12V SLA in series with my 24V Nimh to give 36V (40V+ when charged fully) and what do you know the throttle lights all lit up!
When accelerating up slopes or holding the throttle wide open the max and mid lights go out and only the min is showing.

Based on this I believe the throttle comes from a 36V system or as previously mentioned there may be some kind of adjustment to set it to work with different voltages.

Paul

 

[gcebiker]

Throttle incorectly supplied

Hi, you have hit the nail on the head, wuxing make a range of throttles to go with many types of kits. One of my bike kits will run on 24-36 volts ...as yours does by the sound of it. so your Throttle will show out when you are using a 24v pack....alternatively if you are running on a 36volt SLA pack then the cutoff your contrller has preset will be far to low for a 36v pack...as it is designed for a 24v pack with a cutoff somewhere around 22volts. I am today changing one of my ebikes to a twist grip with no leds and found that i will have to change the hall effect sensors over as well...wuxing use different ones to the standard no led scooter throttles i have laying around. Cheers