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Discussion Starter #1 (Edited)
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?
 

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Discussion Starter #3 (Edited)
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??
 

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