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  1. dmwahl

    How to hook up pallet jack motor???

    I've had this motor in my garage for a couple of years, bought on craigslist from a guy who thought it was from an electric pallet jack. The real important question though is how to hook it up, specs, etc. I've searched the internet and can't find any hookup diagrams. Any ideas other than trial...
  2. dmwahl

    IS Disc Mount Torque Arm, Clamping Optional

    I'm working on a KMX eTrike, and have the majority of the parts purchased. The one remaining item before I can ride confidently is a rear torque arm. Since the motor I'm using should be capable of 100Nm, I wanted something fairly heavy duty. I considered the doctorbass torque arm (epoxied on)...
  3. dmwahl

    Working for Tesla... What's it like?

    I recently was contacted by a Tesla recruiter about working as a desing/optimization engineer at the new "Gigafactory" in the Reno area and was hoping to get some input on what it's really like to work for Tesla. I know a few people on here have worked for them and probably more know someone who...
  4. dmwahl

    What is typical controller input capacitance?

    I'm designing a fast pre-charge circuit and need to know what the worst case input capacitance to plan for. Most of the bike controllers I've seen (admittedly not many) have on the order of 1-3 470uF caps in parallel on the input (~1500uF) so I figured I would double that and assume 3000uF as my...
  5. dmwahl

    HVC Cutoff circuit for use with cheap CC charger

    I've been using a cheap ebay 3A/60V charger (58.4V actual output) to charge my 16S LiFePO4 pack and using my DIY BMS. The problem is that unlike a nice charger that would start to taper the current as it gets close to the end of charge, this one continues putting out the full current until right...
  6. dmwahl

    5V/250mA supply from up to 140V

    There are often posts on here about powering various low voltage devices from high voltage battery packs, and most of the solutions are to either use a linear regulator (LM317, 78xx, TL783, etc) or use an AC adapter. The problem with linear regulators is heat, getting useful current out of a...
  7. dmwahl

    Electric Snow Blower Conversion

    I've been thinking about converting my snow blower to electric for some time, and after it started and died one too many times after the last snowfall I've finally hit the point where I'm going to do it. The carburetor is in bad need of cleaning, it leaks oil and gas, the head gasket is shot...
  8. dmwahl

    Arduino/Microcontroller BMS - What features do you want?

    I've been working on a microcontroller BMS, based on the ATtiny84 and programmable using the Arduino environment, and wanted to get the community's input on some of the higher level details. I already have a thread with a more in depth discussion of the technical details, things like why I chose...
  9. dmwahl

    3-192S Arduino BMS (using BQ76PL536A)

    This thread is to document my R&D efforts surrounding the Texas Instruments (TI) BQ76PL536A battery management IC. After following the thread matterrr started about the BQ76PL536A Arduino shield he put together, I started looking into it myself. Since the chips themselves aren't super cheap and...
  10. dmwahl

    Powering Arduino from a 60-100V battery pack

    Is anybody powering an Arduino from their main battery pack? I'm trying to think of ways to do this with minimal power dissipation, while ideally still keeping the drain on each cell equal. It would be easy to do with a linear regulator across the whole pack, but as the Arduino (Uno R3...
  11. dmwahl

    DIY Programmable BMS (now using ATtiny/Arduino)

    I've been designing my own BMS recently and I'm wondering if there would be enough interest on the ES forum to make the bare PCBs (or pre-assembled boards) available. Current features: 8-24 cells in series, although I could easily expand this to support a higher cell count with just a few...
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