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  1. #1
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    Crystalyte 36-72 volt digital controller

    Hey guys, I'm hoping you guys could help. In the interest of safety, I've downgraded from 74 volts to 37 volts (lithium polymer voltage). I've got a new controller which is the digital variable 36-72 volts controller and in addition have gotten the digital readout that measures amps, volts, etc.

    The problem I'm having is that the digital controller has a tendency to power-down quite noticeably when 50 amps is surpassed which is quite easy to do. Even at max speed of 30ish mph, when I'm sitting upright with a jacket on, it's pulling about 50 amps due to wind resistance/slight uphills.

    So, I need to raise the amperage capabilities. Now, the question is, can I simply solder more FETs to double the capacity or is there some other electronic circuitry that I need to play around with in order raise the amperage limits?

    Would it be more cost effective just to buy a 200 amp bike controller? How do I go about finding an adapter for the hall sensors and throttle? Any help would be greatly appreciated.

    -Young

  2. #2
    Senior Member
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    Quote Originally Posted by Optimaman View Post
    Hey guys, I'm hoping you guys could help. In the interest of safety, I've downgraded from 74 volts to 37 volts (lithium polymer voltage). I've got a new controller which is the digital variable 36-72 volts controller and in addition have gotten the digital readout that measures amps, volts, etc.

    The problem I'm having is that the digital controller has a tendency to power-down quite noticeably when 50 amps is surpassed which is quite easy to do. Even at max speed of 30ish mph, when I'm sitting upright with a jacket on, it's pulling about 50 amps due to wind resistance/slight uphills.

    So, I need to raise the amperage capabilities. Now, the question is, can I simply solder more FETs to double the capacity or is there some other electronic circuitry that I need to play around with in order raise the amperage limits?

    Would it be more cost effective just to buy a 200 amp bike controller? How do I go about finding an adapter for the hall sensors and throttle? Any help would be greatly appreciated.

    -Young

    You might find you'll get more answers at this site
    http://www.endless-sphere.com/forums...9b3ee7b047efc8

    They've discussed this issue ad nauseum and there are how to posts on the subject by real knowlegeable people. This site is full of smart guys too, it just seems that quite often it's lacking on replies to some types of posting.... anyways what I'm trying to say, go there, you'll see...


  3. #3
    Electricity Lover
    Join Date
    Dec 2008
    My Bikes
    Specialized Hardrock, one folding e-bike, and one Phoenix Racer E-bike Kit by www.wattcycle.com using a cheap Schwinn Cruiser frame
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    For anyone looking for replacement controllers for e-bike kits, try here: http://www.wattcycle.com/shop/home.php?cat=261

    Most of these are the controllers that come with our Crystalyte e-bike kits.
    Wattcycle.com for everything electric bike related. Including the new X-Treme™ XM-5000Li - using a multiple lithium battery bank with a top speed of 60 MPH and a maximum distance of 85 miles.
    Complete Crystalyte bike kits available as well.
    Wattcycle Blog here.
    Wattcycle E-commerce shop here.
    [SIGPIC][/SIGPIC]

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