Search found 67 matches

by Alex W
Sep 16 2021 11:00am
Forum: EBike Technical
Topic: Sempu Torque Sensor Help
Replies: 25
Views: 2478

Re: Sempu Torque Sensor Help

The E-Rider sensor doesn't work with decent cranks. Yep, I'm looking at the same thing. I have the E-Rider and it does work well, but the available cranks aren't as good as my original and the Sempu T2 let's me use my original crankset. If I have to replace the bottom bracket every 2 years, I can l...
by Alex W
Jun 24 2021 4:43pm
Forum: EBike General Discussion
Topic: Geared Hub vs Mid-Drive?
Replies: 20
Views: 1069

Re: Geared Hub vs Mid-Drive?

A big mid-drive con for me is that it gives you less flexibility in designing the system (controller, motor, bottom bracket, cranks are all a fixed system). Many mid-drive systems (like the popular Bafang BBS series) don't have torque sensing bottom brackets. I find torque sensing pretty essential f...
by Alex W
Apr 14 2021 2:29pm
Forum: EBike Technical
Topic: Sempu Torque Sensor Help
Replies: 25
Views: 2478

Re: Sempu Torque Sensor Help

Why do you want a Sempu?! There where many quality issues with them, I think this is the reason, why grin doesn't offer them any more. My recommendation is the E-Rider sensor, you can get it from aliexpress or from Grin... The E-Rider sensor doesn't work with decent cranks. I don't want wide and lo...
by Alex W
Apr 13 2021 4:18pm
Forum: EBike Technical
Topic: Sempu Torque Sensor Help
Replies: 25
Views: 2478

Re: Sempu Torque Sensor Help

Where can these be purchased now that Grin isn't carrying them? Do other suppliers includes a CAv3 compatible cable? I understand why Grin stopped carrying them, but prefer the Sempu to the other options that I've seen and used. I have a 6 year old Thun with lots of miles that will need replacement ...
by Alex W
Mar 17 2021 10:06am
Forum: EBike General Discussion
Topic: Small hub motor
Replies: 29
Views: 6175

Re: Small hub motor

I'm replying for the sake of the archives. I have a G370 on my commuter bike, it was an upgrade from a G31x to get a lighter and more compact motor. Something to be aware of: the G370 won't fit with some dropouts, it is best with fork dropouts that are on the inside of the fork blade (instead of cen...
by Alex W
Jan 14 2021 12:18pm
Forum: Electric Watercraft
Topic: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor
Replies: 80
Views: 14490

Re: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

Justin: This is really cool, thanks for sharing. I'm another sailor/ev/bike nerd and have been interested in electric inboard options for my sailboat one day. There isn't a lot of real data out there so it is great that you have figured out ways to gather so much data, especially the strain gauge fo...
by Alex W
Aug 06 2019 6:20pm
Forum: EBike Technical
Topic: 2019 Motor Simulator, Mid-drives and other updates
Replies: 52
Views: 14657

Re: 2019 Motor Simulator, Mid-drives and other updates

G370 is in the simulator. The hub looks awesome! When can I buy one from ebikes.ca? Normalized for Kv it looks a lot like the G311: https://www.ebikes.ca/tools/simulator.html?bopen=true&motor=MG310_STD&grade=0&hp=0&motor_b=MG370_10T&hp_b=0&grade_b=0&axis=mph&mass=90&a...
by Alex W
Aug 06 2019 10:24am
Forum: EBike Technical
Topic: How to plan how much battery I need for a TSDZ2?
Replies: 5
Views: 1188

Re: How to plan how much battery I need for a TSDZ2?

Because the TSDZ2 is a torque sensitive assist, how much battery you need directly depends on how hard you pedal (or not) if I understand correctly. There are a ton of variables, the most important one for my battery life is the max speed at which I get assistance. If I set this at about 30kmh I wi...
by Alex W
Jul 02 2019 11:13am
Forum: EBike General Discussion
Topic: How to convert anderson plugs to Higo plugs?
Replies: 10
Views: 1245

Re: How to convert anderson plugs to Higo plugs?

The BaseRunner comes with a very short Higo cable, so most bikes need an extension anyway. Making a custom Higo to Anderson adapter is cheap and easy and will let you combine your parts. I've always used Bafang Higo cables and cut them in half, they come with standard color coded wires.
by Alex W
Jun 17 2019 10:49am
Forum: EBike Technical
Topic: Sempu Torque Sensor Help
Replies: 25
Views: 2478

Re: Sempu Torque Sensor Help

It's okay for the CAv3 to flip to "custom". The Sempu settings just get you close, but every device will have slightly different components and require zeroing out.

I hope that your new BB solves the problems and that Sempu reliability goes up!
by Alex W
Jun 14 2019 4:31pm
Forum: EBike Technical
Topic: Sempu Torque Sensor Help
Replies: 25
Views: 2478

Re: Sempu Torque Sensor Help

You should test by seeing if the CAv3 can show pedal RPMs and pedal torque (in newton meters). There is a calibration step to zero out the pedal torque. This will let you see if it is a programming issue with the torque assist in the CAv3, or just a basic sensor issue. The installation of these is a...
by Alex W
Jun 14 2019 11:33am
Forum: EBike General Discussion
Topic: Love the Baserunner, suggested improvements
Replies: 26
Views: 6100

Re: Love the Baserunner, suggested improvements

Yes, you can pull the Baserunner out of it's carrier and mount it differently. It mounts with 4 M3 screws and so you can make a different aluminum heatsink for a custom mounting. I plan on doing this soon with my regular bike. A downside is that the Baserunner has very short power cables (they need ...
by Alex W
Jun 13 2019 6:09pm
Forum: EBike General Discussion
Topic: Love the Baserunner, suggested improvements
Replies: 26
Views: 6100

Re: Love the Baserunner, suggested improvements

I have two bikes with the Base Runner now, and one uses a Hailong battery case. It works great and cleaned up the installation.

A standalone version would be nice too.
by Alex W
Jun 13 2019 3:53pm
Forum: EBike Technical
Topic: Bafang G3xx series high reduction ratio geared hub motors
Replies: 92
Views: 23407

Re: Bafang G3xx series high reduction ratio geared hub motors

The G370 is really interesting, has anyone tried it yet? You mean this little guy? I reallly think that this is either a typo or an inconsistent evaluation metric, though testing will reveal soon enough. The G370 rotor is so much smaller in diameter (40mm, vs 60mm for the 311) that it's hard to see...
by Alex W
May 23 2019 10:05am
Forum: EBike Technical
Topic: Bafang G3xx series high reduction ratio geared hub motors
Replies: 92
Views: 23407

Re: Bafang G3xx series high reduction ratio geared hub motors

The G370 is really interesting, has anyone tried it yet? This looks like a nice hub for lightweight conversions. My everyday bike today uses a G311 and 2 LiGo batteries, but I have the Baserunner set to a max of 10 amps (around 360 watts), so a 2lb lighter and lower power hub would fit my uses very ...
by Alex W
Apr 09 2019 2:47pm
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

eZee will do it too. Like the BBS it is sold as 250W, though it is a much stronger motor. It'll be burning 36wh/km climbing a 10% grade at 20kph, so you'll want to carry a huge battery. WTH? Ezee 250rpm might make it to 15kph if you push it to 200W leg power, and you can get there before it overhea...
by Alex W
Apr 09 2019 1:59pm
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

eZee will do it too. Like the BBS it is sold as 250W, though it is a much stronger motor. It'll be burning 36wh/km climbing a 10% grade at 20kph, so you'll want to carry a huge battery. BBS01 has some pretty big downsides, especially giving up the ability to get torque sensing and making for a very ...
by Alex W
Apr 09 2019 9:32am
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

I'm looking for a system that gets me to 15-20kph on hills and won't hold me back 80% of my time. No 250W-spec motor is going to get you 15-20kph on 10% grade hills with this load, unless you supply 350-400W yourself (this is approaching racing cyclist in a time trial territory, not sustainable for...
by Alex W
Apr 09 2019 9:29am
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

I'm having a little trouble getting exactly the same results, but I got close for 20" with the leg power stepped up to 200W. But it overheats in 8 minutes. It's a power limitation? OK, let's step to a 48V 35A controller ... hm, overheats in 5 minutes. Granted, that's at a much higher speed, so...
by Alex W
Apr 08 2019 9:41pm
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

That is a power limitation more than a gearing one. You can simulate this by changing the drive wheel size down, using the "G310 standard" and going from 26" to 20" gets the motor into a more efficient zone and gets the speed up from 13.6kmh to 14.6kmh. That is a minor bump. Of c...
by Alex W
Apr 08 2019 4:04pm
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

and this is why factoring in human power is important. Without it at this grade the hub is almost stalled and is in a very inefficient power range where it can't really operate. In that case you won't see any difference between the hubs, both are in the very inefficient speed range: https://i.imgur....
by Alex W
Apr 08 2019 3:59pm
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

Oops, you are right, sorry about that mistake. Here is the same thing with the G310 VFast vs standard: https://i.imgur.com/kVfFgCv.png The "standard" hub gets more speed and efficiency in this use. You can feel it while riding too (just having gone from a G01 "fast" at 12.5 RPM/V...
by Alex W
Apr 08 2019 3:21pm
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

If you look at the G310 hubs with multiple windings you can see a real difference. Here is a screenshot with 100W of human input: https://i.imgur.com/9FYdywk.png It is silly to look at zero human input for motors in this range, they are only designed for assist applications. 200W is a more realistic...
by Alex W
Apr 08 2019 11:11am
Forum: EBike General Discussion
Topic: Looking for 250W option
Replies: 49
Views: 3121

Re: Looking for 250W option

My cargo bike weighs about 30kg with all of the kid stuff and I ride with a 15kg kid on it. This is lighter than the OPs setup, but closer than a road bike conversion. I live in Seattle and ride up a fairly steep 3km long hill to get to my in-laws house, so this is a regular ride for us. We also hav...