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  1. mrbill

    USB fast-charger powered by e-bike battery

    Hi Folks: Does anyone know of a USB charger that will push at least 1 Amp when its input is hooked to a typical e-bike battery, say 20-100 VDC (or if that's asking too much, then 44-60 VDC)? For the last few years I've been using some cheap 120/240 VAC USB chargers that function as a charger...
  2. mrbill

    DD Hub motors: Why only 23 pole pairs?

    Over the last couple of years I have been experimenting with direct-drive (DD) hub motors on my bikes, building them into ISO 559 wheels (26" MTB wheels). Since I live in an area where there are many hills, I have found the advent of Statorade, Hubsinks, and motor braking to be beneficial. My...
  3. mrbill

    BMS cell-balancing function creates cell imbalance

    In early 2014 I purchased a number of Lithium batteries from EM3EV, built from the Samsung INR-18650-29E cells. Four batteries are configured as 7s9p, and two are configured as 7s12p. EM3EV supplied at my request a "2-wire" (same charge and discharge circuit) BMS for each battery. The BMS is...
  4. mrbill

    Hub motor axle bolt tightening torque - How much is enough?

    Folks: I've got an ongoing problem with loosening axle nuts. I'm using a medium-power Nine Continents M3006RC as sold (but now discontinued) by Grin: http://www.ebikes.ca/shop/discontinued/m3006rc.html and on both left and right dropouts, Doctorbass's hardened steel torque arms...
  5. mrbill

    Annual Battery Capacity Test

    I've written up a page that summarizes my annual battery capacity test on my e-bike batteries (Samsung INR18650-29E cells) that see no more than 50 cycles each per year. The main take-away from is that capacity declines most significantly during the first year of use, then declines more...
  6. mrbill

    Mega-Monster Enduro, February 6, 2016, Paicines, California

    Hi Folks: Ebikes and other forms of human-powered transportation are welcome at this open road event in Central California (about 1 hour drive south of San Jose, 6 hours north of Los Angeles). Ride 100 miles or 100 kilometers. Please see details at the following link...
  7. mrbill

    California: AB-1096 to classify an "electric bicycle"

    Folks: About a year ago I posted that the California State Legislature was considering a bill to classify an electric bicycle (e-bike). http://endless-sphere.com/forums/viewtopic.php?f=3&t=59103 That bill was truncated in committee and most of the changes it proposed did not become law. This...
  8. mrbill

    Nine Continents M3006RC/Lyen MKII testing, regen questions

    I've started to play around with a hub motor and regen braking. Got a few questions for folks with more experience than I. I have the controller programmed to the highest level of regen braking. I'm using the new Nine Continents M3006RC DD hub motor with a Lyen MKII 12-Fet controller run at...
  9. mrbill

    Low-Key Megamonster, February 7, 2015

    Hi Folks: Ebikes and other forms of human-powered transportation are welcome at this open road event in Central California (about 1 hour's drive south of San Jose, 6 hours north of Los Angeles). Ride 100 miles or 100 kilometers. Please see details at the following link...
  10. mrbill

    Torque arm question

    Hi Folks: After happily using a mid-drive for about eight years, I've decided to expand my e-bike knowledge and experience by experimenting with a DD hub motor. I've settled on the newer Nine Continents 3006 (rear) sold by Grin, running on a Lyen 12FET Mk2 controller at 48 volts nominal. I...
  11. mrbill

    Looking for Replacement BMS's for Varta and BMZ batteries

    Hi Folks: I recently acquired two non-functioning e-bike batteries to see if I could revive them. After some testing and partial disassembly I discovered that the cells in both batteries were in good shape and all balanced, but the BMSs in both batteries were not working. Since these are...
  12. mrbill

    House destroyed while charging e-bike battery in Bend, OR

    Hey Guys: Anyone know more about this incident? http://www.ktvz.com/news/bend-house-fire-raises-lithium-battery-issues/27888920
  13. mrbill

    NTS Works Demo, Fat Free E-bike, Aptos CA, July 13, 2014, 2p

    NTS Works will be showing off their new Fat Free e-bike in front of Cafe Rio in Aptos, CA on Sunday July 13, 2014 from 2:00 P.M. to 5:30 P.M. Demo rides will be available. Readers living in and near Santa Cruz, CA are welcome to stop by and have a look-see-ride. The bike is designed to be a...
  14. mrbill

    Long-distance e-bikes

    My bikes are set up for riding long distances, usually greater than 50 miles (80km) and as much as 200 miles (322km) in one go. This requires large-capacity batteries and careful mounting to carry the weight of them without degrading bike handling and also careful attention to aerodynamics to...
  15. mrbill

    Best e-bike tire? (specs: 35-40/559, 75-85psi, 100kg load)

    Hi Folks: I'm looking for a good tire for the rear wheel of my e-bikes. Weight on the rear wheel is up to (100kg) and motor power is 750 watts at the wheel. Speed varies but typical cruising speed varies from 30-50 km/h with occasional pops up to 90km/h on a downhill run. I ride long...
  16. mrbill

    California: AB2173 to classify a low-speed electric bicycle

    Folks: I know this forum is read internationally, but readers in the state of California (USA) should be aware that a bill is working its way through the legislative process that changes the legal treatment of electric bicycles in the California Vehicle Code...
  17. mrbill

    Adding third-party battery to GoSwiss Drive

    Folks: I'm helping a friend set up a wiring harness to attach a third-party battery to a GoSwiss Drive kit. http://www.go-swissdrive.com/das-go-swissdrive-system/ The problem is that I need a connector that looks like this on this Varta battery: that mates to the connector on a bracket...
  18. mrbill

    Samsung INR-18650-29E optimal charge/discharge protocol

    I recently purchased some battery packs using these cells from cell_man. As some of you may know cell_man offers chargers for his Lithium-Ion battery packs that give the user the option to charge to 3.8v, 4.1v or 4.2v per cell, selectable by a switch on the charger. Charging to 3.8v per cell...
  19. mrbill

    Cellog 8S display goes blank

    Hi Folks: I just bought a couple of Cellog 8S battery monitors (firmware version 2.0.8) from HobbyKing, and I'm having trouble with both of them. After being hooked up to the battery I get the start-up chime, then the intro screens, then a voltage screen. As I cycle through the voltage...
  20. mrbill

    Re-purposing old batteries

    I plan to upgrade soon the batteries I'm using on my ebikes. My old batteries (Valence U1-12RT) still work fine (Rint around 20mOhm), but they're heavy by today's standards given their current capacity, about 60-65wh/kg. So, I don't think they're quite ready for the recyclers. I was thinking...
  21. mrbill

    Charging batteries in parallel

    I often find myself running two or more batteries on my ebike that share the same chemistry but have different pack capacity. When I wire these to my controller I run each of them through a Schottky diode, anode side toward battery positive and cathode toward controller positive, so that one...
  22. mrbill

    Low-Key Megamonster 2/8/2014, Central California

    Ebikes and other forms of human-powered transportation are welcome at this open road event in Central California (about 1 hour's drive south of San Jose, 6 hours north of Los Angeles). Ride 100 miles or 100 kilometers. Please see details at the following link...
  23. mrbill

    Low-Key Hillclimbs 2013 - SF Bay Area

    Folks: I help organize a weekly bicycle hill climb event that has been run annually on Saturday mornings in October and November, in the San Francisco Bay Area. We're about five weeks out from our first event. http://lowkeyhillclimbs.com/2013/ E-bikes are welcome, but please note that we're...
  24. mrbill

    Boeing Dreamliner Battery Fire

    Does anyone know what kind of lithium batteries are installed in the Boeing 787 Dreamliner? CNBC reported recently on a fire that broke out on one parked at BOS that was connected to the lithium battery power supply. Anyone have additional information...
  25. mrbill

    MegaMonster 2013

    Ebikes are welcome at this open road event in Central California (about 1 hour's drive south of San Jose, 6 hours north of Los Angeles). Please see details at the following link: http://megamonster.lowkeyhillclimbs.com/2013/ Now is the time to work on your bike's aerodynamics and pedaling...
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