Recent content by Suspect

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.

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

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...

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...

Thanks for the reference, it clears all doubt.

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...

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...

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...

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...

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...

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...

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.

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...

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...

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