Search found 11624 matches

by fechter
Jan 23, 2018 9:12 am
Forum: E-Bike Technical
Topic: MAC motor controller?
Replies: 3
Views: 71

Re: MAC motor controller?

I seem to recall that the older MAC motors had an issue with the hall sensor placement that gives it an inherent timing advance. The controllers made for these motors dealt with the advance somehow. Newer versions of the MAC had more standard hall placement that works with most controllers.
by fechter
Jan 23, 2018 9:03 am
Forum: E-Bike General Discussion
Topic: Marin County, San Francisco Bay Area?
Replies: 20
Views: 255

Re: Marin County, San Francisco Bay Area?

If you live in Marin County, at least one rider is planning to attend the next meeting on this subject. https://electricbikereview.com/forum/threads/voice-your-support-for-ebikes-on-trails-in-marin-county.15866/ https://www.meetup.com/ebiketreks/events/246886216/?_cookie-check=lj6j73uK6dh-Qypv Let ...
by fechter
Jan 23, 2018 8:57 am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 624
Views: 21099

Re: la Nina rears her ugly head

Got about 0.5" yesterday. This brings my season total to 10.4" This time last year was over 40".
by fechter
Jan 23, 2018 8:55 am
Forum: Battery Technology
Topic: BMS not balancing...
Replies: 7
Views: 70

Re: BMS not balancing...

Good deal.

Many chargers will just turn off when it reaches end of charge and not come back on until the pack gets discharged some. I guess yours supports balancing. A 'dumb' Meanwell will work the same way.
by fechter
Jan 23, 2018 8:52 am
Forum: Battery Technology
Topic: How to measure amps
Replies: 14
Views: 290

Re: How to measure amps

Hi The shunt I had was a one off taken out of a turnigy 130a watts up type meter that had stopped working. I’ve found some sad resistors that I think will do the job they are 0.5mohm 3w about 5mm x10mm. Maximum load would be 80a at 10v typical would be 40a at 72v approx 2.5kw. Kendrick At 50A, the ...
by fechter
Jan 22, 2018 4:58 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 4wd 3.2kw mobility scooter
Replies: 9
Views: 57

Re: 4wd 3.2kw mobility scooter

These guys have the slippy tire thing figured out: https://endless-sphere.com/forums/viewtopic.php?f=35&t=84936&p=1279998&hilit=drift+trike#p1279998 Find just the right size of plastic pipe and slice off pieces. Deflate tire and press on. Reinflate tire to keep them on. When they wear out, replace t...
by fechter
Jan 22, 2018 3:16 pm
Forum: Battery Technology
Topic: BMS not balancing...
Replies: 7
Views: 70

Re: BMS not balancing...

Since the balancing shunts are pretty low current, it might take a LOT of cycles to bring up the low cells. If you don't want to individually charge the low cells, then charging the pack repeatedly is another way to do it. With enough cycles, it should eventually balance. If you have a power supply ...
by fechter
Jan 22, 2018 9:33 am
Forum: E-Bike Technical
Topic: A2B problem
Replies: 2
Views: 38

Re: A2B problem

Sounds like a blown controller. It's buried inside the wheel.

There are a few topics around on A2B bikes.

Mine is only one of them, but shows replacing the controller with an external one.
https://endless-sphere.com/forums/viewt ... =6&t=50590
by fechter
Jan 22, 2018 9:25 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Torque / Speed Help - DIY 800W 36V Scooter build - 11F / 74R Sprockets - GoPed conversion
Replies: 11
Views: 58

Re: Torque / Speed Help - DIY 800W 36V Scooter build - 11F / 74R Sprockets - GoPed conversion

Do you have any way to measure the battery current? That would tell you a lot. If geared too low, top speed will be slow, but it should be able to climb a tree and do wheelies. Another test is to measure the full throttle speed with the wheel off the ground and compare that to actual riding. It does...
by fechter
Jan 22, 2018 9:10 am
Forum: E-Bike General Discussion
Topic: Challenge with brakes
Replies: 20
Views: 320

Re: Challenge with brakes

mighty82 wrote:
Jan 22, 2018 4:56 am
Yes, that is a lock built into the frame.
OK, guess that won't work.
by fechter
Jan 22, 2018 9:07 am
Forum: Battery Technology
Topic: Solder longevity on nickel
Replies: 10
Views: 144

Re: Solder longevity on nickel

If the nickel gets above the melting point of the solder, it should flow nicely. You need to have good thermal contact between the tip of the iron and the nickel. I press the tip against the work and feed in a tiny bit of solder to act as a heat bridge until it heats enough to flow, then feed in mor...
by fechter
Jan 21, 2018 8:09 pm
Forum: E-Bike General Discussion
Topic: Challenge with brakes
Replies: 20
Views: 320

Re: Challenge with brakes

If you wait long enough the images might appear.

This is what I was looking at.
Bike Frame 1.JPG
Bike Frame 1.JPG (161.84 KiB) Viewed 132 times
by fechter
Jan 21, 2018 8:02 pm
Forum: Battery Technology
Topic: Solder longevity on nickel
Replies: 10
Views: 144

Re: Solder longevity on nickel

Are you sure you have nickel and not stainless steel? Nickel flows nicely with just a little flux. You can use rosin (non-acid) flux.
by fechter
Jan 21, 2018 1:37 pm
Forum: E-Bike General Discussion
Topic: Challenge with brakes
Replies: 20
Views: 320

Re: Challenge with brakes

The seat stays look like they have mounts for rim brakes.
by fechter
Jan 21, 2018 1:33 am
Forum: Vendor Relations Corner
Topic: Voltaplex
Replies: 1
Views: 44

Re: Voltaplex

Never heard of them. Their website says:
Our manufacturing centers are in Dongguan, Shenzhen, and Xiamen, PRC. Our mailing and marketing office is located in Hong Kong.
by fechter
Jan 21, 2018 1:21 am
Forum: E-Bike Technical
Topic: Anyone know the name of this connector and how to disconnect it?
Replies: 4
Views: 102

Re: Anyone know the name of this connector and how to disconnect it?

I bet they glued it with hot melt glue. If you press the release tab, it should come apart easily. You could try heating with a hair dryer to soften the glue. Rubbing alcohol also helps release hot melt glue (use cold). If all else fails, just cut the wires and get a new connector.
by fechter
Jan 20, 2018 5:39 pm
Forum: Motor Technology
Topic: E-Bike Problems
Replies: 2
Views: 47

Re: E-Bike Problems

Could possibly be the brake switches. You could try just unplugging them and test.

Also make sure the battery is charged. If the battery voltage is too low, it cuts off the power.
by fechter
Jan 20, 2018 5:36 pm
Forum: E-Bike General Discussion
Topic: Active pre-charge/inrush control
Replies: 664
Views: 51516

Re: Active pre-charge/inrush control

For turn off, you could borrow part of the circuit below (done by one of our members long ago). Just substitute your Schmitt trigger for the input. This circuit provides a fast turn off even with a slow input. The gate driver chip I found can reduce the parts count quite a bit, but maybe not the cos...
by fechter
Jan 20, 2018 4:20 pm
Forum: E-Bike General Discussion
Topic: Active pre-charge/inrush control
Replies: 664
Views: 51516

Re: Active pre-charge/inrush control

I think it will work, but it needs to be tested. My spot welder uses the FETs to switch against essentially a dead short, with current over 2000A and they work fine.
by fechter
Jan 20, 2018 4:18 pm
Forum: E-Bike General Discussion
Topic: Marin County, San Francisco Bay Area?
Replies: 20
Views: 255

Re: Marin County, San Francisco Bay Area?

If you live in Marin County, at least one rider is planning to attend the next meeting on this subject. https://electricbikereview.com/forum/threads/voice-your-support-for-ebikes-on-trails-in-marin-county.15866/ https://www.meetup.com/ebiketreks/events/246886216/?_cookie-check=lj6j73uK6dh-Qypv That...
by fechter
Jan 20, 2018 1:54 pm
Forum: Battery Technology
Topic: Solder longevity on nickel
Replies: 10
Views: 144

Re: Solder longevity on nickel

Generally, solder works great on nickel. Good long term.

You may need to use some flux and cleaning the nickel first helps. The mechanical strength of solder is less than nickel, so it will peel if you pull hard enough.
by fechter
Jan 20, 2018 1:24 pm
Forum: General Discussion
Topic: Reid Welch Returns (was Re: E.S. Quotable Quotes !)
Replies: 13
Views: 177

Reid Welch Returns (was Re: E.S. Quotable Quotes !)

Reid_Welch wrote:
Jan 20, 2018 12:21 pm
what goes around comes around
Is that really our Reid Welch? Back from another dimension?
by fechter
Jan 20, 2018 1:00 pm
Forum: E-Bike Photos & Video
Topic: A2b metro gti
Replies: 76
Views: 4830

Re: A2b metro gti

Here is the build thread for my A2B Metro:
https://endless-sphere.com/forums/viewt ... =6&t=50590

I used the stock motor and modified it for an external controller. So much better now.
by fechter
Jan 19, 2018 8:38 pm
Forum: E-Bike Photos & Video
Topic: A2b metro gti
Replies: 76
Views: 4830

Re: A2b metro gti

I have a 14s, 9p pack I put on the back of my A2B. It weighs about 13.5lb. The weight on the rear doesn't really seem to bother the handling much. If I'm just running to the store or a short trip, I use the frame pack, but for longer rides I put the big battery on the rear and have two batteries. 50...