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by Offroader
Apr 01, 2018 1:38 pm
Forum: E-Bike General Discussion
Topic: Qulbix New high end mid-drive ebike
Replies: 20
Views: 1103

Re: Qulbix New high end mid-drive ebike

I would love to test ride this bike to compare it to a my direct drive hub motored bike., This may be the real deal if you want performance, this uses an actual hub motor as the mid drive motor and not some of those other wimpy mid drive hub motors that other mid drive bikes use. Some things I would...
by Offroader
Mar 15, 2018 4:23 pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2040
Views: 274740

Re: Definitive Tests on the Heating and Cooling of Hub Motors

I have been away from my ebike for quite a while. Last summer I was in the process of lacing a cromotor for FF to test against my custom air cooled cromotor. I never finished through with the project. The wheel just needs to be trued and FF + hubsinks added. I still believe my air cooled motor will ...
by Offroader
Feb 25, 2018 12:09 am
Forum: E-Bike General Discussion
Topic: Qulbix New high end mid-drive ebike
Replies: 20
Views: 1103

Re: Qulbix New high end mid-drive ebike

I believe optimally you want a wider motor. However, there is probably not all that much space when you have to attach two chains (one for pedals and one to the rear wheel), and sides of swingarm to be less than 140mm or less than the width of the frame. They probably could fit a wider motor than a ...
by Offroader
Feb 20, 2018 7:06 pm
Forum: E-Bike General Discussion
Topic: Qulbix New high end mid-drive ebike
Replies: 20
Views: 1103

Re: Qulbix New high end mid-drive ebike

If the hub motor is direct chain drive wouldn't you want to run higher voltage to get higher RPM for a higher Top Speed?

Or would you have to run a very low turned motor to get the RPM up to deal with the gearing? Or possibly both?
by Offroader
Feb 20, 2018 7:00 pm
Forum: E-Bike General Discussion
Topic: Qulbix New high end mid-drive ebike
Replies: 20
Views: 1103

Re: Qulbix New high end mid-drive ebike

Ditch the pedals,, give me pegs for my legs. Just so you know, Qulbix has a great footpeg option that bolts into the bottom bracket. I use it on my Qulbix Q76R. Footpegs are worlds better than pedals, everything from strain off your knees, much better control of the bike, much easier to land jumps,...
by Offroader
Feb 20, 2018 10:51 am
Forum: E-Bike General Discussion
Topic: Qulbix New high end mid-drive ebike
Replies: 20
Views: 1103

Re: Qulbix High end mid-drive bike

Yes Qulbix never fails to impress me and that is why I bought a few of their frames. It is really the only frames I have bought. I guess we would need to know how the drive chain actually works out. I heard this was a big issue with most mid-drive bikes is the drive chain issues. I also wonder about...
by Offroader
Feb 20, 2018 10:26 am
Forum: E-Bike General Discussion
Topic: Qulbix New high end mid-drive ebike
Replies: 20
Views: 1103

Qulbix New high end mid-drive ebike

Just got the Email from Qulbix about their new mid-drive. I have never considered a mid-drive due to the lower power and related drive train issues. I knew there will be a time when mid-drives were the only way to go for a performance bike and hub motors in the rear wheel became basically obsolete. ...
by Offroader
Dec 21, 2017 10:15 am
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery
Replies: 103
Views: 4447

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

For those who are interested watch these videos made by Toshiba when they punctured, overcharged cells, and crushed them. http://www.scib.jp/en/about/index.htm#con1 That's insane! Where/how did you buy these? Expensive? These packs are filled with 24 20 amp hour cells. They are from a Honda Fit ele...
by Offroader
Dec 19, 2017 11:41 am
Forum: Battery Technology
Topic: Safe to charge lipo over 4.2 volts if resting voltage under 4.2?
Replies: 3
Views: 218

Safe to charge lipo over 4.2 volts if resting voltage under 4.2?

I have asked this question before and was told that I can charge lipo over 4.2 volts as long as the resting voltage is under 4.2 volts. For example, while charging a Lipo at a high rate the voltage will spike to maybe 4.25 volts under charge but when you stop charge the lipo will have a restring vol...
by Offroader
Dec 19, 2017 11:35 am
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery
Replies: 103
Views: 4447

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

For those who are interested watch these videos made by Toshiba when they punctured, overcharged cells, and crushed them.

http://www.scib.jp/en/about/index.htm#con1
by Offroader
Dec 19, 2017 11:28 am
Forum: Battery Technology
Topic: LTO Lithium Titanium Oxide (Titanate) Battery 30S - Seeking the Ultimate Commuter Battery
Replies: 103
Views: 4447

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

I use LTO 20 amp hour Toshiba SCIB cells in my Honda hybrid car to replace the NiMH batteries. These things are really good. From my testing they really don't need to be balanced. They stay perfectly balanced to .001 volts and I didn't bother with a BMS. You are not using the Toshiba cells so they m...
by Offroader
Nov 24, 2017 8:54 am
Forum: General Discussion
Topic: Ebike hobby has increased my knowledge of electronics so much.
Replies: 3
Views: 306

Re: Ebike hobby has increased my knowledge of electronics so much.

markz wrote:
Nov 23, 2017 10:15 pm
Cool, duct tape looks better ;)
I like the clear tape to be able to see the wires and solder connections just to make sure everything is OK. Not that I ever check anything anyway. The clear tape works really well and can easily be removed.
by Offroader
Nov 23, 2017 9:52 pm
Forum: General Discussion
Topic: Ebike hobby has increased my knowledge of electronics so much.
Replies: 3
Views: 306

Ebike hobby has increased my knowledge of electronics so much.

I really knew nothing about electronics or circuit boards a few years ago before I had this hobby. Because I had to deal with so many issues, fixing controllers, electrical issues, building my own battery pack, etc., I've became a lot more knowledgeable about electronics. I practically knew nothing ...
by Offroader
Oct 29, 2017 9:26 am
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1108
Views: 121393

Re: JP spot welder

Riba, with those Electrodes, are they hollow through the whole electrode so I can fit a wire in it?

Would it be possible to cut the crimped top part so I can fit a new wire in and recrimp it?
by Offroader
Oct 10, 2017 7:45 am
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1108
Views: 121393

Re: JP spot welder

That's interesting, I have welded much more than 280 cell with mine, and haven't come anywhere near that. Maybe you should just raise the welding battery so the cable exits terminals in straight angle. I have no problems building electrodes with better (maybe even a bit longer) cable for a custom o...
by Offroader
Oct 08, 2017 8:58 pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1108
Views: 121393

Re: JP spot welder

Here are some pics of my welder cables and how they are slowly breaking. This is why I don't recommend this type of cable and make sure you get the ultra flex. Stiff cables suck to weld with. I also recommend having the cables at least 2 feet longer. Oshara said that by adding a couple of diodes in ...
by Offroader
Oct 07, 2017 10:01 am
Forum: Battery Technology
Topic: Your DIY battery weight survey
Replies: 11
Views: 691

Re: Your DIY battery weight survey

I have a 3.5 KWH pack that weighs 31 lbs (14 KG)

But since the cells don't really output 3500 MAH, more like 3350 when new, it is really a 3.3KWH pack.
by Offroader
Oct 05, 2017 7:24 pm
Forum: Battery Technology
Topic: Running slightly different AMP hour cells in series question
Replies: 5
Views: 316

Re: Running slightly different AMP hour cells in series ques

I guess it makes sense to top them all off at full voltage, then lower them together? Then monitor the strong ones to make sure they don't get overcharged? The way I see it is I won't go anywhere near too low as I will stay above 20% capacity, but I like to charge sometimes close to full. So I assum...
by Offroader
Oct 05, 2017 3:11 pm
Forum: Battery Technology
Topic: Running slightly different AMP hour cells in series question
Replies: 5
Views: 316

Running slightly different AMP hour cells in series question

I'm building an electric car battery pack and this will use 84 20 amp hour cells. 24 of the 84 cells will have 1 amp hour higher in capacity. So 24 cells will be 21 amp hour and 60 cells will have 20 amp hour. Assume the 24 cells move perfectly together in balance, and the 60 cells move perfectly to...
by Offroader
Oct 04, 2017 7:03 pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1108
Views: 121393

Re: JP spot welder

Cables should be as short as possible. Otherwise, in my experience you loose energy to the weld. Its good to have the freedom to move around the pack but this comes at a cost I can't see this being the case with 4 AWG wire? I would just add an extra 12 volt lipo pack if I needed a stronger weld. We...
by Offroader
Oct 04, 2017 4:44 pm
Forum: Items for Sale - New
Topic: JP spot welder
Replies: 1108
Views: 121393

Re: JP spot welder

Confused, does the new welder come with better probe cables? The old cables were not flexible enough and will slowly break/fray where they connect to the battery and welder. Half the wire is severed from both cables building 1 pack. The cables should be very flexible and also be a bit longer so easi...
by Offroader
Oct 01, 2017 12:35 pm
Forum: Battery Technology
Topic: 18650 capacity loss test - garage vs basement vs fridge
Replies: 30
Views: 3513

Re: 18650 capacity loss test - garage vs basement vs fridge

Yes you definitely wouldn't want to keep anything connected, even a BMS, if storing at a low voltage. I had my Adaptto Max-e drain my lipo packs below safe limits once and I believe the max-e screen must have come on for some reason. I'll be checking the cells periodically to see if they drop, but i...
by Offroader
Sep 30, 2017 10:01 pm
Forum: Battery Technology
Topic: 18650 capacity loss test - garage vs basement vs fridge
Replies: 30
Views: 3513

Re: 18650 capacity loss test - garage vs basement vs fridge

I am curious if keeping the cells at 3.0 volts instead of 3.3 volts will cause less capacity loss. The best cells that showed the least amount of yearly loss were stored at 3.3 volts or the lowest voltage in my test. There is 400 MAH capacity between 3.0 and 3.3 volts. Cells have about 3250 MAH betw...
by Offroader
Sep 30, 2017 9:09 am
Forum: Items for Sale - New
Topic: Advanced ADAPTTO controllers and compatible products
Replies: 1533
Views: 175439

Re: Advanced ADAPTTO controllers and compatible products

I think if Adaptto is out another company should come in and make a similar product. I don't know if this may be difficult because of the low salaries and high technical skills that are easier to get in Russia may make it cost prohibitive elsewhere. But their product can easily be copied it is all a...
by Offroader
Sep 21, 2017 11:25 pm
Forum: Battery Technology
Topic: Cheapest, Dumbest BMS?
Replies: 26
Views: 1403

Re: Cheapest, Dumbest BMS?

Not because of lto. Over 32s are rare in any case. I've used lto for a couple years. If it was 64s you could use two, but over two is complex. 20s are under $100. If serious you might try 4 18s lto and isolator pcbs. What is your budget? About $1500 will get you high power active balancers. Virtual...