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  1. E

    picoBMS - LTC6804 - open source, open hardware build

    So it does finally happen. I couldn't find a useful BMS for the electric kickboard I'm working on - so I'm having a friend of mine build one. Specs are roughly: 38x65mm 0.5a balancing current <= 12S, daisy-chainable, RS485 3 temperature sensors (bleeding, battery pack) MCU EFM32ZG108...
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    8mm Gold plug "oxidation"

    So these were on a claimed 10kw RC motor. They look like there was a lot of sparking on the inside but not the contact face. The connectors might have become wet - does that explain it? Since I can't really explain this, maybe someone can elaborate.
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    OpenHardware Active BMS

    So me and a friend hacked together this active BMS within a couple of nightly hacksessions and now we're thinking about doing another few iterations and putting up a kickstarter campaign or the like yielding in a reasonable priced open hardware active BMS. First though I wanted to check with...
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    constant power output possible?

    Is it possible to get constant power at defined throttle with e.g. a kelly KBS72121L (or other controller) using batteries? (dropping voltage during discharge) If not - do you know of a small enough 1000W DC-DC converter that can achieve the desired constant power to the motor even on half full...
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    Dual chainwheel, with freewheel

    Not yet complete, not manufactured, but what do you think of what I came up this weekend? freewheel+bearing: CSK20PP (green, left) needle bearings: HK2516, HK1516 red chainwheel is a cart 219 60 teeth blue chainweel is a triathlon 56 teeth 1/2" x 3/32" I still have to find a way to stop the...
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    E-Freeride project - Backfire LRS

    So finally I'm building my first e"bike". I've been reading a lot on es during the last year and was initially aiming for a 125 conversion but now I'm on the way with an e-freerider and with the 125 project pushed to somewhen later I'm getting parts that I will probably be using in the bigger...
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    CenterTrack belt system

    I stumbled across and was wondering if it has already been used in an ebike conversion?
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    achieve defined voltage from full to empty? LiPo cap BMS?

    black line: typical discharge curve. How can I make use of the red box. I'm finally working on my first electrify project and I want it to have the same driving characteristics from full to empty. Or is the only way to achieve behaviour by having some clever software in the ESC? I acquired 20...
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    125cc bike conversion - share your thoughts

    Hello everyone, I got infected reading up on all kinds of pedelec, e-trikes, aircrafts and the like projects. Now I want to build my own one during the next 3 months. I don't know if this has been done before. I think of converting a 125cc 2-stroke bike to an all electric one. If you know of a...
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