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  1. S

    Good Things to say about BMSBattery

    So far my odds with them have been 50/50. One order was good and the other had a charger that only smoked and burned.
  2. S

    Which battery to choose, Li-Ion or LifePo4?

    One of two chargers I've purchased from BMS were garbage out of the box. :( That could be a cost factor worth considering.
  3. S

    which battery chemistry is best for solar charging?

    I have 24 V Li batteries and made a "test" setup like this: (custom module with 25X PV cells in series, 156 mm x 156 mm polycrystaline, output is ~13 V @ ~8 A) => (Boost converter to output ~30 V) => (arduino micro-controller switching a mosfet that limits voltage to 29.4 V) This would work at...
  4. S

    GNG, 1000W 48V BB-drive, $400

    I think the Nuvinci has a lot of other advantages. I use one on my mid-drive. Mine is 400 W (45 N*m max motor output from the bottom bracket (not including my input)). Advantage: Shift fast Come off the shelf with a twist grip throttle (indexed shifters are too slow) Come off the shelf...
  5. S

    E.S. bottom bracket drive.

    Thanks for the reference, it clears all doubt.
  6. S

    E.S. bottom bracket drive.

    I decided against doing a destructive test because I doubt the failure mode is the same for a static load test. I did however check ES for references to Matex and found a lot of evidence that the planetary units should be adequate. There were a few references of using them for years with...
  7. S

    E.S. bottom bracket drive.

    If they are not input values then I've been lucky. My current build runs two stages. The second stage has the male spline input with a rating of 22.5 N*m. I've got spares at home, maybe I'll do a destructive test with one. I've ridden 100's of hard miles with no troubles. The gears and...
  8. S

    E.S. bottom bracket drive.

    The current gear housing and planetary sets I'm working with require a 8 mm OD D-shaft from the motor input. Torque is limited to ~8 N*m. Does anybody know of a source for motors with the same 8 mm D-shaft output but with higher power capability? Does anybody know of a motor that comes with an...
  9. S

    E.S. bottom bracket drive.

    I have a bike that's close to this design. I've been thinking about doing a Kickstarter project to see if there was interest in the mid-drive approach. I have a freewheel on the bottom bracket and a MAC like motor with a planetary reduction. Here are some rough specs: 300 W 24 V, 12 Ah...
  10. S

    Let's talk electrically heated clothing for EV users…

    Search "heated seats" and a bunch of inexpensive 12V products come up ($15 to $60). These items may be good for converting. There are some "instructables" on this topic as well: http://www.instructables.com/id/DIY-heated-clothing/ I've wanted to make my own heated clothing for a while, good...
  11. S

    Best 250W electric middle motor?

    Why do you want a shaft drive? Would you consider a belt drive? Seems like you could get some of the same features but it would be easier to implement. I have a mid-drive that uses a 24 V Kollmorgen motor. My battery is 25.6 V, 12.5 Ah, lithium chemistry that I've probably got 4000 miles on...
  12. S

    Oregon Manifest: Designing the ultimate modern utility bike

    I'm definitely jealous! I wish I'd been able to launch a kickstarter project for a version of my latest bike with the kind of success they've managed. ...maybe next spring.
  13. S

    Oregon Manifest: Designing the ultimate modern utility bike

    said: "It's about time someone got the batteries inside the tubing." I disagree. I bet 80% of the people on this forum thought about it and didn't because there's just not enough room. A 10 mile range is pathetic and yet people are buying them... Also, the chromoly tube wrapped around the...
  14. S

    Your Creation's Before & After Pics

    I picked up the planetary sets from Matex (http://www.matexgears.com/). I made the housing myself. In the next couple of months I may make a few more if you're interested. This is a 2-stage with 14.4:1 reduction. The ratios and torque limits can be adapted slightly based on Matex's...
  15. S

    Your Creation's Before & After Pics

    24 V, 300 W, planetary reduction of 14.4. It weights about 21 kg with the 12.5 Ah battery.
  16. S

    I've tried machining clamps, gluing machined clamps and weld

    I've tried machining clamps, gluing machined clamps and welding in studs. Welding is what I've settled on. I have 12 mm diameter round rod studs that run through my down tube. These are threaded for easy attachment/adjustment. Welding these cost $50 since I brought it in all jigged up and...
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