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  1. SamRich

    Nanjing far driver controllers

    I had an issue where regen wouldn't kickin unless I was below 80V. Turns out you need to change the Full battCoeff under the PROTECT section. I had adjusted the Full battCoeff value initially to get a better gauge estimate for battery capacity but apparently it was too low and messed up the...
  2. SamRich

    controlling the speed of bldc hub motor from the arduino

    Something like this? https://endless-sphere.com/forums/viewtopic.php?f=2&t=57927&p=864122#p864122
  3. SamRich

    LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery

    I wouldn't say zero advantages. Fast charging is a significant advantage but I agree... probably not for ebikes. Being able to charge in freezing weather was one important advantage for me. A very high number of charge cycles is another advantage - lifetime Wh/$ is very high. W/$ was better...
  4. SamRich

    LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery

    OP here. After 1 year or so of riding LTO last year, I decided to look into 18650 li-ion cells instead. The LTO worked fine for commuting, but I couldn't use it as much as I wanted for other uses due to limited range and at >100lbs it's not an easy bike to pedal. I made the following chart to...
  5. SamRich

    Radwagon 72v GMAC Phaserunner Build

    That's a very clean build! You can barely tell that's it's electric. I think I might steal that string LED idea. Thanks for sharing all those pics! If it's ok I thought I'd share a few pics of my similar build. Had my Radwagon for nearly 2 years now.We bought it used on CL (2016 model I...
  6. SamRich

    Li-ion cells cycle ageing

    For what it's worth (and sorry if a little off topic and anecdotal) , but I have also noticed "single cell" self discharge issue on several 30Q packs including not only with the 3 packs that I have built myself (80-140 cells per pack), but also on two 352 cells packs (88S4P) that I...
  7. SamRich

    how to protect hub for winter and salt and water

    From my experience, motor itself is less of an issue if it's well sealed. Be sure to protect the wiring going to it. I have had this winter commuting hub (35mm) since 2015 and rode it through 4 winter ~4000 miles (6000 km) of harsh riding I recently had to replace the hall/phase wire since...
  8. SamRich

    Fast Electric Cargo Bike for my Bay Area Commute

    I have pretty much built that bike (after many trials-and-error) and can share my experience. Motor: Mid-drives are generally better for hills if you don't have much power. I find them not very reliable for commuting at the speed you are looking at. Hub-motors are much more reliable and...
  9. SamRich

    Ebike anti-theft, GPS and motion alarms, suggestions?

    Yeah I thought of just putting a "This bike is equipped with a GPS tracking device" sticker on it...kinda like my fake ADT sign on my front lawn :P
  10. SamRich

    Ebike anti-theft, GPS and motion alarms, suggestions?

    Most US cell providers no longer support 2G so most "no contract" GPS trackers won't work. I found this DIY solution using arduino, but requires pricey sheild: https://create.arduino.cc/projecthub/botletics/real-time-2g-3g-lte-arduino-gps-tracker-iot-dashboard-01d471
  11. SamRich

    Where do I get special spokes for my hub motor?

    Point well taken. My experience is mainly on streets (and I assume OP's as well). I was going to recommend a any "decent" rim but decided to name a specific model that I like. The MTX 39 is better option but also more expensive - I mean where do one draw the line when one bought the whole DD...
  12. SamRich

    Where do I get special spokes for my hub motor?

    As Markz said (and many other on this forum) and my own experience 12GA is too big for most bicycle rims. 13G with reduction nipples (to fit a standard rim made for 14G nipples) has been my best option for DD hubs. Combined with a Sun Ringle Rhyno lite double walled rim, it will last forever (if...
  13. SamRich

    Throttle solution for drop bars / road bikes with Arduino

  14. SamRich

    Throttle solution for drop bars / road bikes with Arduino

    I don't know if it will help, but I think my diagram is wrong for the low-pass filter the resistor should be on the other side of the cap.
  15. SamRich

    Mongoose Dolomite Fat Bike 72V 3kW Options

    I fit a QS205 and a 45H 150mm on my dolomite, but I have DR bass dropouts welded on the inside that are 10 mm thick. So I think 170 mm hub will be fine. I had to fabricate a spacer for the Disc brakes. I also chopped the downtube, but would not recommend unless you know what you are getting...
  16. SamRich

    Sabvoton SVMC72060 Regen/Slide Problems

    I saw on another thread that the regen won't work if battery voltage is higher than the "overvolt" value minus 10V, mine is set at 88V so regen only works when battery is below 78V (tested to confirm). This is a bit of an issue since I have an 82-84V battery when fully charged.... I think the...
  17. SamRich

    Sabvoton SVMC72060 Regen/Slide Problems

    Having the same issue. When I connect the brake wire to ground it cut-offs the motor but I get no regen. Do I need to go to 5V (or B+) instead?
  18. SamRich

    Mounting a battery in a gas tank

    Love the moped projects! I am concerned about the battery pack heating up and vibration. What current are you planning to draw? I'd recommend drilling large venting holes that would provide airflow, make sure it isn't just trapped since air is also a good insulator. How tight is the battery...
  19. SamRich

    DIY Build - Touring eBike - Journal - Beginner

    I understand your point and you've shared it many times :)....There are tradeoffs for sure, but the truth is that bicycle tires were not designed for the torque of ebike and tend to wear prematurely on bikes with more than 1000W of power. Lightweight moped rims and tires are not that much...
  20. SamRich

    DIY Build - Touring eBike - Journal - Beginner

    Sounds like a great project. Here are my recommendations (stuff I wish someone would have told me 5 years ago when I started) MOTOR I have quit a bit of experience in touring and building a wide range of bikes ranging from low power geared hub motors, direct hub motors and mid-drives. If you...
  21. SamRich

    3rd ebike battery. This time, doing it right

    Here's what I did on my last triangle pack: Used 1/8" Polycarbonate (would recommend 3/32" instead) Used heat gun to shape into shell: And 1.5" velcro to hold the battery to frame: BTW this was the Layout for that pack... you can see how each P group has a maximum of series connection...
  22. SamRich

    3rd ebike battery. This time, doing it right

    It may be better than it seems - so glad to hear that. But it still looks like the distribution of current is not equally balanced across some of the cells. I know form experience that it is a challenge when building a triangle packs, so not trivial to find a better design. Do you know how much...
  23. SamRich

    3rd ebike battery. This time, doing it right

    Sorry to say, but your pack will not last long the way it is built. You have too many bottlenecks that will stress individual cells, create heat, premature wear and an unbalanced pack with lower capacity and increased voltage sag. I would consider re-designing the wiring to maximize the number...
  24. SamRich

    DIY HI POWERED PACK: First time, General questions

    If you use a cycle analyst it can automatically reduce current based on battery temp, motor temp and SOC
  25. SamRich

    DIY HI POWERED PACK: First time, General questions

    :bigthumb: Agreed. I like your way of thinking about the problem.
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