Q100 with Ku93 48V - help needed

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Jul 28, 2012
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I am about to build a new bike for my girlfriend with the spare parts i got lying around.
A Q100 36V (201 rpm), a KU93 controller, a 48V battery.

I have understood from reading here that KU93 gives too many amps for the motor, so i need to file the shunt. My question is, how much should i file it down? and do you have any tips on the filing technique to get it just right, and not getting metal from the shunt inside the controller?

Or do you think it would be a better option to get a Ku65 for this setup?

Thanks!
 
Research indicates the KU93 has two shunts. Cutting one of them completely should halve the amperage of the controller, to around 12 amps. I am about to test this very combination myself...a Cute100, KU93 and 48V Ping (16S) typically around 53 volts. The KU93 has 63V capacitors and is listed as "for" 48V" nominal operation. I've been blowing the KU63s I've been using, on the 48V battery, after "some" time..typically a month or two.
 
15 amps is a safe limit for that motor with a 48v battery. In theory cutting one shunt should give you 11 amps, then a bit of solder on the other would bring it up to 15 amps. You need a wattmeter to confirm what you've got. It's not an exact science.
 
when they calibrate the shunts at the factory the person testing has some dikes and they use the dikes to cut part way through the shunt wire in several places just enuff to get the voltage of the test in the range but they don't cut all the way through. just partially in several places.
 
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