Search found 139 matches

by SamRich
Aug 19 2020 10:22am
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery
Replies: 177
Views: 30715

Re: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery

li ion is best choice - LTO has zero advantages - with my ebike frame for example I can fit max 20s20p pack built with HG2 cells - 4,3kWh and 60Ah I wouldn't say zero advantages. Fast charging is a significant advantage but I agree... probably not for ebikes. Being able to charge in freezing weathe...
by SamRich
Apr 16 2020 8:45am
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery
Replies: 177
Views: 30715

Re: LTO Lithium Titanium Oxide (Titanate) Battery 30S (now 32S)- Seeking the Ultimate Commuter Battery

OP here. After 1 year or so of riding LTO last year, I decided to look into 18650 li-ion cells instead. The LTO worked fine for commuting, but I couldn't use it as much as I wanted for other uses due to limited range and at >100lbs it's not an easy bike to pedal. I made the following chart to compar...
by SamRich
Jan 29 2020 4:01pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Radwagon 72v GMAC Phaserunner Build
Replies: 79
Views: 7817

Re: Radwagon 72v GMAC Phaserunner Build

That's a very clean build! You can barely tell that's it's electric. I think I might steal that string LED idea. Thanks for sharing all those pics! If it's ok I thought I'd share a few pics of my similar build. Had my Radwagon for nearly 2 years now.We bought it used on CL (2016 model I think). The ...
by SamRich
Nov 19 2019 4:53pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 472
Views: 51690

Re: Li-ion cells cycle ageing

It seems that 9 out of 10 packs fail after just some months of use, because single cells of 30Qs do develop heavy self discharging For what it's worth (and sorry if a little off topic and anecdotal) , but I have also noticed "single cell" self discharge issue on several 30Q packs including not only...
by SamRich
Oct 28 2019 10:22am
Forum: E-Bike Technical
Topic: how to protect hub for winter and salt and water
Replies: 18
Views: 2004

Re: how to protect hub for winter and salt and water

From my experience, motor itself is less of an issue if it's well sealed. Be sure to protect the wiring going to it. I have had this winter commuting hub (35mm) since 2015 and rode it through 4 winter ~4000 miles (6000 km) of harsh riding https://lh3.googleusercontent.com/MINMSPuuD19yo4i7Xo47yVS0NXO...
by SamRich
Oct 16 2019 2:55pm
Forum: E-Bike General Discussion
Topic: Fast Electric Cargo Bike for my Bay Area Commute
Replies: 16
Views: 1232

Re: Fast Electric Cargo Bike for my Bay Area Commute

I have pretty much built that bike (after many trials-and-error) and can share my experience. Motor: Mid-drives are generally better for hills if you don't have much power. I find them not very reliable for commuting at the speed you are looking at. Hub-motors are much more reliable and cheaper. If ...
by SamRich
Sep 05 2019 6:41pm
Forum: E-Bike General Discussion
Topic: Ebike anti-theft, GPS and motion alarms, suggestions?
Replies: 22
Views: 1922

Re: Ebike anti-theft, GPS and motion alarms, suggestions?

My experience is that you don’t need an alarm, as long as thieves believe you got one. Just a blinking blue led on the bike and a small disc lock are enough to discourage most of them. And, those who are not discouraged would have stolen it anyway, despite any protections. Most of the time I don’t ...
by SamRich
Sep 05 2019 3:46pm
Forum: E-Bike General Discussion
Topic: Ebike anti-theft, GPS and motion alarms, suggestions?
Replies: 22
Views: 1922

Re: Ebike anti-theft, GPS and motion alarms, suggestions?

Most US cell providers no longer support 2G so most "no contract" GPS trackers won't work. I found this DIY solution using arduino, but requires pricey sheild:
https://create.arduino.cc/projecthub/bo ... ard-01d471
by SamRich
Sep 05 2019 2:45pm
Forum: E-Bike General Discussion
Topic: Where do I get special spokes for my hub motor?
Replies: 24
Views: 1177

Re: Where do I get special spokes for my hub motor?

...Combined with a Sun Ringle Rhyno lite double walled rim, it will last forever (if built properly). Sorry Sam Forever for you, does sound one week to me. I have destroyed enough Rhino Lites. Not saying Sun rims are sh*t, we are many riding mountain trails on MTX 39 or Double Track. On the street ...
by SamRich
Sep 05 2019 2:08pm
Forum: E-Bike General Discussion
Topic: Where do I get special spokes for my hub motor?
Replies: 24
Views: 1177

Re: Where do I get special spokes for my hub motor?

As Markz said (and many other on this forum) and my own experience 12GA is too big for most bicycle rims. 13G with reduction nipples (to fit a standard rim made for 14G nipples) has been my best option for DD hubs. Combined with a Sun Ringle Rhyno lite double walled rim, it will last forever (if bui...
by SamRich
Aug 12 2019 3:30pm
Forum: E-Bike Technical
Topic: Throttle solution for drop bars / road bikes with Arduino
Replies: 17
Views: 2771

Re: Throttle solution for drop bars / road bikes with Arduino

I couldn't find a good solution for speed modulation with dropbars. I tried installing a throttle but it won't fit on the bars and even if it did the ergonomics wouldn't be great. There was a good discussion here: http://endless-sphere.com/forums/viewtopic.php?f=3&t=25334 I have some experience usi...
by SamRich
Aug 12 2019 3:28pm
Forum: E-Bike Technical
Topic: Throttle solution for drop bars / road bikes with Arduino
Replies: 17
Views: 2771

Re: Throttle solution for drop bars / road bikes with Arduino

Hi I'm new to arduino and almost made Sam's version run in a modified version. I've replaced the "power" button with a speed Sensor/reed switch on the wheel and want it to be turned ON as long as the wheel is turning. "Reset" is connected to the brakes as a safety instead of a switch. My problem wi...
by SamRich
Jul 31 2019 3:41pm
Forum: E-Bike General Discussion
Topic: Mongoose Dolomite Fat Bike 72V 3kW Options
Replies: 2
Views: 1284

Re: Mongoose Dolomite Fat Bike 72V 3kW Options

I fit a QS205 and a 45H 150mm on my dolomite, but I have DR bass dropouts welded on the inside that are 10 mm thick. So I think 170 mm hub will be fine. I had to fabricate a spacer for the Disc brakes. https://lh3.googleusercontent.com/wRkCbpRo4f5OsXngXjCjgOBeU2EOZTJ5IIoz0ET5mtARhOSaQ9GGeyvLk8DX8gKt...
by SamRich
Jul 21 2019 7:58pm
Forum: E-Bike Technical
Topic: Sabvoton SVMC72060 Regen/Slide Problems
Replies: 7
Views: 1701

Re: Sabvoton SVMC72060 Regen/Slide Problems

Having the same issue. When I connect the brake wire to ground it cut-offs the motor but I get no regen. Do I need to go to 5V (or B+) instead? I saw on another thread that the regen won't work if battery voltage is higher than the "overvolt" value minus 10V, mine is set at 88V so regen only works ...
by SamRich
Jul 21 2019 5:57pm
Forum: E-Bike Technical
Topic: Sabvoton SVMC72060 Regen/Slide Problems
Replies: 7
Views: 1701

Re: Sabvoton SVMC72060 Regen/Slide Problems

Having the same issue. When I connect the brake wire to ground it cut-offs the motor but I get no regen.
Do I need to go to 5V (or B+) instead?
by SamRich
Jun 06 2019 3:25pm
Forum: Battery Technology
Topic: Mounting a battery in a gas tank
Replies: 3
Views: 467

Re: Mounting a battery in a gas tank

Love the moped projects! I am concerned about the battery pack heating up and vibration. What current are you planning to draw? I'd recommend drilling large venting holes that would provide airflow, make sure it isn't just trapped since air is also a good insulator. How tight is the battery in there...
by SamRich
Apr 20 2019 7:52am
Forum: E-Bike General Discussion
Topic: DIY Build - Touring eBike - Journal - Beginner
Replies: 72
Views: 5209

Re: DIY Build - Touring eBike - Journal - Beginner

Moped tires are about the same cost as normal tires but will last 5-10X longer. And all that time, they'll waste as much juice and range as if you used bicycle tires and dragged a pig heavy moto tire behind you on a rope. Not worth it. I understand your point and you've shared it many times :)....T...
by SamRich
Apr 18 2019 12:12pm
Forum: E-Bike General Discussion
Topic: DIY Build - Touring eBike - Journal - Beginner
Replies: 72
Views: 5209

Re: DIY Build - Touring eBike - Journal - Beginner

Sounds like a great project. Here are my recommendations (stuff I wish someone would have told me 5 years ago when I started) MOTOR I have quit a bit of experience in touring and building a wide range of bikes ranging from low power geared hub motors, direct hub motors and mid-drives. If you are out...
by SamRich
Apr 10 2019 7:56am
Forum: Battery Technology
Topic: 3rd ebike battery. This time, doing it right
Replies: 101
Views: 8652

Re: 3rd ebike battery. This time, doing it right

Oh and by the way. I've decided to ditch my battery bag idea. I'm going for straight battery box connected to the bike. The shape of the battery matches the frame of my bike so I have the idea of using metal and durable velcro straps to tie the battery down to the bike. I'll cut slots in the long s...
by SamRich
Apr 10 2019 7:49am
Forum: Battery Technology
Topic: 3rd ebike battery. This time, doing it right
Replies: 101
Views: 8652

Re: 3rd ebike battery. This time, doing it right

The series connections are at least 2 pieces of copper braid (wick wire). The wire is about 0.5mm x 3.5mm. With the connections that look like just 1, I've double layered them to be 2 thick rather than 1. It may be better than it seems - so glad to hear that. But it still looks like the distributio...
by SamRich
Apr 09 2019 11:05am
Forum: Battery Technology
Topic: 3rd ebike battery. This time, doing it right
Replies: 101
Views: 8652

Re: 3rd ebike battery. This time, doing it right

Sorry to say, but your pack will not last long the way it is built. You have too many bottlenecks that will stress individual cells, create heat, premature wear and an unbalanced pack with lower capacity and increased voltage sag. https://lh3.googleusercontent.com/wp9Xr3ebYuDa6CGEuRZh2gH0OUCJnbOunGk...
by SamRich
Mar 22 2019 6:34am
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 3947

Re: DIY HI POWERED PACK: First time, General questions

Jonathan1981 wrote:
Mar 21 2019 10:14pm

yeah, my pack is big so there there will definitely be wiggle room. I'll probably just put a temp sensor in there and turn down the draw if anything spikes....
If you use a cycle analyst it can automatically reduce current based on battery temp, motor temp and SOC
by SamRich
Mar 21 2019 7:32pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 3947

Re: DIY HI POWERED PACK: First time, General questions

it would be awesome to find a cheap mold-able material the could do that. I was thinking something like mixing aluminum powder into a soft two part epoxy and molding a thin layer around each cell?..... thoughts, links etc???? just trying to think of a cost effective DIY cooling solution for such a ...
by SamRich
Mar 21 2019 4:51pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 3947

Re: DIY HI POWERED PACK: First time, General questions

Yeah totally realizing that now.... it's just a different "can" size lol :(. Just crossing fingers that goodenoughs' glass substrate research comes through. Has anyone here experimented with materials to help passively cool the batteries, like some sort of gel or putty that can be molded around the...
by SamRich
Mar 21 2019 2:39pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 3947

Re: DIY HI POWERED PACK: First time, General questions

Yeah, that math is better.... like I said, was just a rough calc...but Tesla makes it seems like it's a more energy dense battery, it's misleading. Yeah it's just basic physics, unless you dramatically change the chemistry you can't get more energy out of a unit of li-ion battery. Now that cells pe...