bike went full throttle riding in the wet

[texaspyro]

Ebike throttles are a major safety hazard. There is no safety or redundancy built in... a single point of catastrophic failure.

A good throttle should have (at least) two position sensing devices (best implemented with two different sensing technologies that generate signals of opposite polarity). The sensor readings should agree with each other to get a valid throttle reading, otherwise shut down the motor. And it's not a good idea to have the decision made in the throttle that feeds a single signal to the controller. The independent sensor readings should be fed to the controller and the controller should make the judgement.

 

[hydro-one]

That is a great idea. whos gonna make that!!!! or who does make it . keywin r u listening?

 

[nechaus]

With brushed setups it is more common though, its more to do with when the controllers fail as the fets often fail to a dead short and bridge the battery volts to the motor and being brushed thats all it needs to get your ass moving to the scene of the accident :lol: , this is not likely to happen on a brushless setup however as you have seen throttle failures will, ebrakes are a very good idea although they are always make to break which is no good if the cable is broken or the switch stops working, they should be normally closed in a loop to prevent any problems.

I have a cheap bar mounted pit bike kill switch on all my rides, I can switch it in a second, never had to use it though as I run quality Resistive Magura throttles on all my bikes, would never use a hall throttle on anything high powered, seen far too many fail.

It cracks me up people spend $1000 + more on ebike stuff and spend no money on any safety and then connect a 1 dollar throttle to it? fine if you are running 250W but not 2500W

iv had brushed controller fail on me like that b4.. a few times when i was a in my teens using ebikes with brushed motors back in the day.
Yeah well this is my first throttle failure, im more inclined to buy a magura throttle.

Maybe ill just go back to a single full power switch, hop around the streets.

 

[nechaus]

Sorry my mistake the throttle was actually $2
http://www.bmsbattery.com/ebike-parts/50-twist-grip-throttle.html
the $2 throttle id advise everyone to not use.

 

[icecube57]

VASALINE!

 

[nechaus]

seriously ?

 

[icecube57]

Put it all entraces on the outside of the throttle so that water doesnt seep in. Doesnt hurt to pack it a little bit like bearing grease into bearings.

 

[naujasacc1]

It's quite old topic, but I had same experience.

Now in North EU we have snow, so on road there is lot of wet snow looking like mass of snow...

I stopped next to traffic light (red) and lucky I am, cus i was first in a line. And my bike catch somewhere drop of water and goes full speed. I have E brake button just for safety, but I was only able to hold handle bars due of acceleration.

Under investigation I found, that inside throttle hall sensor is have naked wires and they are very close each other. But, also there is small gap between those wires ant part of the throttle which is twisting.
So if handle are wet, that water (if you twist throttle) goes straight to wires. This is how I get 5V instead of 1.1V.

Before I was loosing regen brake (this issue are related).

What i did? I bought varnish in can and spray on those wires several times.

Tested with pouring some water on wires. Nothing happen. All done.

 

[Philaphlous]

It's quite old topic, but I had same experience.

Now in North EU we have snow, so on road there is lot of wet snow looking like mass of snow...

I stopped next to traffic light (red) and lucky I am, cus i was first in a line. And my bike catch somewhere drop of water and goes full speed. I have E brake button just for safety, but I was only able to hold handle bars due of acceleration.

Under investigation I found, that inside throttle hall sensor is have naked wires and they are very close each other. But, also there is small gap between those wires ant part of the throttle which is twisting.
So if handle are wet, that water (if you twist throttle) goes straight to wires. This is how I get 5V instead of 1.1V.

Before I was loosing regen brake (this issue are related).

What i did? I bought varnish in can and spray on those wires several times.

Tested with pouring some water on wires. Nothing happen. All done.

I need to do this on my bike. I found this coming from 2 sources... First is the wire connections to the controller..if the throttle wires are soaked in water it's easy for them to either short out or go full throttle. 2nd is the throttle as you describe. I'm planning on using liquid electrical tape as I've got that now... Do you have the half twist throttle? How did you take it apart to get to the wires????

 

[fechter]

Most cheap throttles have exposed legs on the sensor that need to be coated with some kind of insulator. Epoxy, silicone, or even nail polish will work. You need to completely cover the wires from the sensor to where they attach to the cable. Done properly, the throttle should work fine underwater.

There are a lot of different construction types, so how to disassemble varies with each model. On many of them, the moving part of the throttle parts snap together with tabs that are against the handlebars when installed (inside the hole). Trick is to pry it apart without breaking the tabs. Some are glued together, so not so easy.

The one below had a little trim piece held in by a screw that gave access to the area.

 

[izeman]

I have heat shrink full length covered, and filled the remaining space with vaseline. Never had an issue after that.

 

[Philaphlous]

Most cheap throttles have exposed legs on the sensor that need to be coated with some kind of insulator. Epoxy, silicone, or even nail polish will work. You need to completely cover the wires from the sensor to where they attach to the cable. Done properly, the throttle should work fine underwater.

There are a lot of different construction types, so how to disassemble varies with each model. On many of them, the moving part of the throttle parts snap together with tabs that are against the handlebars when installed (inside the hole). Trick is to pry it apart without breaking the tabs. Some are glued together, so not so easy.

The one below had a little trim piece held in by a screw that gave access to the area.

Throttle wires.jpg

You sir are the best! Thank you! I've got the same little cover on the side of the throttle...I also have led indicator lights I've cut the wires to since I don't like them...lol. Did you have to have the throttle off the handlebars to open it or can I keep it on the bars?

This is literally the last component to waterproof on my bike...

 

[fechter]

You sir are the best! Thank you! I've got the same little cover on the side of the throttle...I also have led indicator lights I've cut the wires to since I don't like them...lol. Did you have to have the throttle off the handlebars to open it or can I keep it on the bars?

This is literally the last component to waterproof on my bike...

You can open it on the bars without removing the throttle. If you use runny glue, you might have to tip the bike over so it doesn't run out. Also be careful not to glue the throttle grip to the body. You can slip a piece of plastic bag plastic under the sensor and the glue won't stick to the bag. Nail polish or paint is the easiest.

 

[naujasacc1]

In my throttle hall legs is about 1mm naked, and gap between rotating handle and naked hall wires almost 1mm (maybe less). So in my opinion best way to cower was with liquid consistency near to water to fill all wires 100%.

 

[amberwolf]

Most cheap throttles have exposed legs on the sensor that need to be coated with some kind of insulator. Epoxy, silicone, or even nail polish will work. You need to completely cover the wires from the sensor to where they attach to the cable. Done properly, the throttle should work fine underwater.

And as noted previously, vaseline (or battery terminal grease) filling the active electronics area / wiring terminals / connector housings will also prevent water from getting onto the parts you don't want it to.

(unless you have temperatures high enough to liquefy it and let it "flow" out).

 

[Chalo]

And as noted previously, vaseline (or battery terminal grease) filling the active electronics area / wiring terminals / connector housings will also prevent water from getting onto the parts you don't want it to.

(unless you have temperatures high enough to liquefy it and let it "flow" out).

Vaseline in a technical application is almost always inferior to an appropriate grease. In this case, it would be a waterproof dielectric grease.

 

[amberwolf]

Which is why I also suggested teh battery terminal grease. I'm sure there's even better ones out there.

 

[Philaphlous]

I made a quick guide! Let me know what you guys think! Wow that wire had 0 heatshrink on it...
[youtube]WaLIzq3SZVk[/youtube]

 

[Toorbough ULL-Zeveigh]

pshaw, taint nuthin.
you just stumbled onto a chinese easter egg tis all.
the one they call 'reedikkeruss mode'.
you cheep round-eyed bastard.