[RoughRider]

my Kelly KBL 120V 250A controller needs a power supply...

it should be: 10-30V...

so my question is: do i need a dc-dc-converter or can i just build a 18V battery and put it directly to the controller?

 

[RIPPERTON]

supply voltage is 18 - 136 so you would use your main battery pack to power the controller.
I have the same setup on my 72v Giant MTB.
I run 80v through a handle bar switch to the precharge resistor.
When precharge volts are up I just engage main contact which is manual not electro.

http://www.newkellycontroller.com/kbl12251h24-120v250abldc-controllerwith-regen-p-198.html

 

[RoughRider]

supply voltage is 18 - 136 so you would use your main battery pack to power the controller.
I have the same setup on my 72v Giant MTB.
I run 80v through a handle bar switch to the precharge resistor.
When precharge volts are up I just engage main contact which is manual not electro.

http://www.newkellycontroller.com/kbl12251h24-120v250abldc-controllerwith-regen-p-198.html

in the manual for the KBL-series they write: supply voltage is 8-30V for controllers over 72V

do you have a supply power to the pin1 at J2??

 

[RoughRider]

supply voltage is 18 - 136 so you would use your main battery pack to power the controller.
I have the same setup on my 72v Giant MTB.
I run 80v through a handle bar switch to the precharge resistor.
When precharge volts are up I just engage main contact which is manual not electro.

http://www.newkellycontroller.com/kbl12251h24-120v250abldc-controllerwith-regen-p-198.html

what kind of precharge resistor do you use?

 

[RIPPERTON]

1k ohm
if you got the controller new from Kelly they should have shipped one with it.

 

[RoughRider]

my controller came a year ago without the resister.

how many watts is your resistor good for?

 

[RIPPERTON]

10w...................

 

[RoughRider]

10w...................

thanks for the informations...

and you just use a switch...no relais for the resistor?

how long do you precharge before you turn the main switch/relais on?

 

[RIPPERTON]

A heavily resisted circuit has very little amperage flow so you dont get any arcing at the contacts inside the switch so you dont need a relay.
wait about 15 seconds or just watch your volt meter if you have it connected to the controller side.