Make own Controller?

[shoartie]

So I purchased a Ridstar Q20 Ebike and the controller went out within a week... the seller wont accept returns, and apparently wont send me the controller on ebay either... so long story short... I need to make my own controller or see if there are universal ones available?

Or do I HAVE to somehow get the Ridstar people to work with me.

 

[m@Robertson]

There are plenty of controllers for sale on their own. The question is whether or not they have the connections to mate up with what you have on the bike. Thats where all the work will be. Be prepared to do things like replace the throttle, display, PAS sensor etc. It may be you can match up the motor plug but your throttle connection is not a match, so you need to sub one in that is.

 

[PCeBiker]

You've got a rear hub drive motor so a KT controller and display should be perfect for you.

Send us a picture of your motor cable connector so we can see it.

A KT conversion kit will replace all the electrics/electronics on your ebike except the battery and motor.

If your motor cable connector is a standard motor cable connector, then the controller will plug right in.

Your battery should easily connect as well.

Everything else can either be reused or easily and cheaply replaced.
(cadence sensor, throttle, brake switches, headlights, etc.)

 

[shoartie]

here is a picture of the connector and thank you first poster as well this information is helpful

 

[PCeBiker]

here is a picture of the connector and thank you first poster as well this information is helpful

That looks like the perfect candidate for a KT conversion,..

The 3 fat wires are your phase wires, or power wires as I call them.
They deliver the power to the motor.

The fat yellow, green, and blue wires are matched with the yellow, green, and blue skinny wires.
Always yellow to yellow, green to green, blue to blue.
The skinny wires monitor the fat wires.

Your red wire is +5 Volts to power the sensors.
Black is negative.
White is the speed sensor wire.

 

[PCeBiker]

So I purchased a Ridstar Q20 Ebike and the controller went out within a week...

Keep in mind that if you just hopped on your ebike and hammered the throttle for a week, that could have cooked your controller.
It takes 27 times more power to go 30 mph than 10 mph.

Your battery needs to deliver huge amounts of current to meet the demand (like 20 or even 30 amps) and that can kill your battery in no time, or even set the damn thing on fire !!

Cheap Chinese batteries can be unsafe.
I hope your battery at least has some kind of BMS?

 

[m@Robertson]

Unfortunately the wiring shown above means you aren't going to be able to do this the easy way with a controller that uses HIGO plugs. Instead it looks like you have JST's, plus those separate bullet connectors for the hall sensors, which is the cheap and not-waterproof stuff. It takes you - most likely - away from using a KT controller and makes your job matching things up tougher. For example the 15-25a Imeiqi controller isn't going to work as the display wires aren't matching - different wire count and different positions in the plug. If the goal is to use something that doesn't require snipping wires and redoing your own connections, at least.

Don't know if you are familiar with wire soldering but these controllers have almost hair-fine wire under that insulation which is no fun to work with.

All of this is do-able but you are probably going to have to learn a whole lot more about ebike controllers and wiring than you want to before this is over.

If you have an ebike shop in your local area - or an electronics repair store, which is a lot more likely to have a smart tech behind the counter who can work thru this - that may be the less painful way to go.