Ku65 controller

[KirstinS]

Hi all

I bought a ku65 controller and handlebar panel which, turns out i now don't need.

I may wire it one day when I upgrade battery as it's 17a vs my current 14a

My question is - it seems to be labeled as "high speed" controller? Still says 250w and 36v which is ht I have

Would I go faster if I connect this ? Or just Chinese sales speak ?

Thanks

 

[Marctwo]

I believe the KU65s usually have a speed limiting jumper cable making it easy to derestrict. So if your current controller is restricted then you may be able to pull an extra couple of mph from the KU65.

But the speed of the motor is determined by the volts not the amps. More amps is better for power intensive things like climbing or accelerating. So with more amps you may be able to climb hills slightly faster.

 

[KirstinS]

I believe the KU65s usually have a speed limiting jumper cable making it easy to derestrict. So if your current controller is restricted then you may be able to pull an extra couple of mph from the KU65.

But the speed of the motor is determined by the volts not the amps. More amps is better for power intensive things like climbing or accelerating. So with more amps you may be able to climb hills slightly faster.

Thanks - undertand about amps vs volts - my battery is prob too weak to really cope with pulling 17a with large sag

I have ordered a 7.4v 9ah booster battery made of same panasonic cells as my main 9a 36v bottle battery which soon be here a a week or two. I would be very interested to know how to derestric the KU65 then. It came with no instructions whatsoever !

 

[Marctwo]

There's a pdf download from BMSBattery detailing the cable functions. Of course, this may not be accurate to your unit if you got it elsewhere. But according to the pdf, leave the single white wires disconnected for unlimited speed.

 

[Deleted member 4366]

High-speed refers to the speed of commutation, not the speed of the motor. The rotor in the Q100 spins very fast so it needs a high commutation speed to keep the pulse timing correct.

The KU65 isn't restricted in any way unless you connect the white wires. How fast the motor spins depends on the design of the motor and how many volts you give it. If you try and make spin faster than the power it can develop, it'll get hot and burn out.

The power that the motor can handle depends approximately on its size. The power that you give it is equal to volts x amps. The amps is controlled by the controller, so you choose a controller that will give the motor the power that you want and then choose a battery to suit.

So in the correct order:
Decide how fast you want to go and how much hill-climbing torque you need; choose the motor; choose the controller; choose the battery.

 

[KirstinS]

Thanks both - thats both questions answered !

BTW D8veh it was your assistance over on ES that led to the puchase of the booster battery. Been sent back by China post twice but hope to get it in two weeks now. Already got the balance leads, charger, voltemeter on the shopping list you very helpfully provided

Sounds like the KU65 will be a bttery controller for that application once I have it all wired up........you may see me coming for more help !

 

[KirstinS]

Oh

And a word of warning - the KU65 no longer has independant throttle. The one they sent me only allows throttle up to 6kph (at least thats what the throttle switch button has written on it)

 

[Deleted member 4366]

Oh

And a word of warning - the KU65 no longer has independant throttle. The one they sent me only allows throttle up to 6kph (at least thats what the throttle switch button has written on it)

I've got one with 6kph written on a button, but the throttle still works independently. I've never used the button, but I guess it works like a 6kph cruise control.

Lots of people asked about booster batteries, but I've never heard of anybody actually doing it. I can't wait for the results.

 

[Marctwo]

6Km/h button:

When you press 6Km/h button and hold it, the ebike will run at 6Km/h speed as your walking speed, and you don't have to push the bike advance since it can run with your normal walking speed.

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