Search found 683 matches

by zzoing
Feb 04 2019 11:57pm
Forum: Battery Technology
Topic: Need help with charger problem. 21V Needed
Replies: 6
Views: 212

Re: Need help with charger problem. 21V Needed

https://fr.aliexpress.com/item/100-240V-DC21V-2A-polymer-lithium-battery-charger-DC-5-5MM-2-1MM-Portable-Charger-EU/32777214791.html?spm=a2g0w.search0604.3.131.72781393ncxU9W&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10068_319_10892_317_10696_10084_453_454_10083_10618_10304_10307_10820_10821_5...
by zzoing
Jan 28 2019 10:12pm
Forum: Battery Technology
Topic: Cap cooling of 18650, thermal output graphs?
Replies: 10
Views: 469

Re: Cap cooling of 18650, thermal output graphs?

Thanks, that's great information. Am studying the graphs. Some varieties of Boron Nitride is a good unobtanium thermally conductive electrical insulator. It's a bit difficult to find but it would be fun to have some at home: https://www.accuratus.com/boron.html here is a video about cap cooling. htt...
by zzoing
Jan 28 2019 2:10pm
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1096

Re: Which battery chemistry for extreme climates?

Couldn't you use the batteries as a passive radiator resistance loop by passing a current through them, i.e 12v 40A through all the caps, as if they were a nickel-chrome radiator wire? They warm up more uniformly through the caps than the sides of the cylinder. Perhaps you can warm the batteries in ...
by zzoing
Jan 22 2019 10:26pm
Forum: Battery Technology
Topic: cylinder vs prismatic battery cell advantages?
Replies: 13
Views: 3095

Re: cylinder vs prismatic battery cell advantages?

Cost, it's mechanically simpler to produce cylindrical wallpaper and baking foil, same for batteries. Strength, companies like nissan actually use strong metal cans to store and cool their prismatics, and a bike with cylinders may resist a fall better. Cooling, cylinders provide some expansion spac...
by zzoing
Dec 30 2018 3:04am
Forum: Battery Technology
Topic: Replacing with Rechargeables
Replies: 9
Views: 253

Re: Replacing with Rechargeables

The most expensive option is keeping your AAA light, because the new batteries cost a lot. If you get a USB rechargable torch using a Cree or another known L.E.D. and an 18650, the light will be stronger and will pay for itself after about 20 battery charges.
by zzoing
Dec 28 2018 12:19pm
Forum: Battery Technology
Topic: Cap cooling of 18650, thermal output graphs?
Replies: 10
Views: 469

Re: Cap cooling of 18650, thermal output graphs?

Oh that's new!!! What's the specification for the sides of the cells? It would be tempting to build batteries where the negative contacts were on the sides of the cells. I want to read some good articles about 18650 cooling, i.e. costs and weights and materials for the task.
by zzoing
Dec 28 2018 11:25am
Forum: Battery Technology
Topic: Cap cooling of 18650, thermal output graphs?
Replies: 10
Views: 469

Cap cooling of 18650, thermal output graphs?

I am researching 18650 cell cooling, one source said that tab cooling prolongs cell life by reaching into all the layers of the battery, is it the same for cylindrical batteries? How many watts of thermal energy does a 3000mah 18650 generate at 1,2,5 and 10C? I found a couple of fun videos of X-ray ...
by zzoing
Nov 14 2018 4:13pm
Forum: E-Vehicles General Discussion
Topic: Self-balancing electric bike
Replies: 23
Views: 1814

Re: Self-balancing electric bike

The three wheel motorbikes like the piaggio seem fun as well. perhaps a fat bike with three wheels would be a new project for a company somewhere.
by zzoing
Nov 14 2018 3:55pm
Forum: E-Vehicles General Discussion
Topic: Find any interesting charging locations?
Replies: 2
Views: 644

Re: Find any interesting charging locations?

Haha, sounds good. I have recharged an ebike on a laundrette building at a supermarket car park, on some bare wires in a carbdoard compressor beside a supermarket, at a plug on the front of a small fire station building, another on the side of the tourist office, at a plug beside a door of a storage...
by zzoing
Nov 09 2018 9:19am
Forum: E-Bike Technical
Topic: Best rear torque arm design/layout?
Replies: 18
Views: 1016

Re: Best rear torque arm design/layout?

Good information about Galvanic Corrosion and carbon fiber epoxy on aluminium. That's not a factor if you use a lock and key system to brace the aluminium. It is only a worry if you carbon fiber onto a flat surface like a bond, only as a glue. If you wrap CF around aluminium, it's set in stone. For ...
by zzoing
Nov 09 2018 8:20am
Forum: E-Vehicles General Discussion
Topic: Is lidar the best sensor for autonomous driving cars?
Replies: 3
Views: 425

Is lidar the best sensor for autonomous driving cars?

If we can have very good autonomous driving, we can reduce insurance costs by 10 times if there are 10 times less collisions. Isn't Lidar is a blunt instrument to use for autonomous cars? The billions of dollars of investment in lidar are not expected to bring hands free commuting in any know timefr...
by zzoing
Oct 10 2018 5:43am
Forum: E-Bike Technical
Topic: Best rear torque arm design/layout?
Replies: 18
Views: 1016

Re: Best rear torque arm design/layout?

If you want to save time on machining metal, and you want a very tight fit to your custom frame, then you can use carbon fiber. Re-cycle one or two of the torque arms, and just mould the axial end into a carbon fiber blob that you wrap to the piece of the frame that you want. Here's an idea for your...
by zzoing
Oct 06 2018 2:18am
Forum: Motor Technology
Topic: Magnax, new axial flux motor
Replies: 16
Views: 1366

Re: Magnax, new axial flux motor

They should send one to Justin so that he can give us some decent efficiency and power and torque ratings for it. I'd say it can have 2x the torque based on the magnet surface area. Whether that means that it captures twice as much as of the magnetic field is another matter. it must be twice as slow...
by zzoing
Jul 19 2018 10:00am
Forum: E-Bike Non-hub Motor Drives
Topic: Crazy Genius bike design crankshaft-speeds
Replies: 9
Views: 542

Crazy Genius bike design crankshaft-speeds

https://www.youtube.com/watch?v=rgo-yEaXDzA

Cool idea for bikes, the V1 is noisy, i'd bet that it can be made as noisy as a regular derailleur.
by zzoing
Jun 30 2018 4:17am
Forum: E-Bike Technical
Topic: Strange Phase Bug
Replies: 1
Views: 168

Strange Phase Bug

When I leave my bike on all night, and try the throttle, the wheel doesn't know what is backwards and forwards, the motor shudders randomly. It's a sensorless 2016 xlyte controller and c9. When I leave the controller off for an hour, and power it up, it works fine, wheel goes around first time, ride...
by zzoing
Jun 17 2018 2:06pm
Forum: Battery Technology
Topic: Making a cheap power pack for my ebike using chinese 18650 clones suggestions?
Replies: 11
Views: 477

Re: Making a cheap power pack for my ebike using chinese 18650 clones suggestions?

https://endless-sphere.com/forums/viewtopic.php?t=61608 ... to find the page I just write... tumich endless sphere... on google. good seller. I tend to go with panasonic because they are rock solid, I kept some of tumich's batteries charged at 4.2 volts for a year and forgot about them... then I bui...
by zzoing
Jun 17 2018 2:16am
Forum: Battery Technology
Topic: Making a cheap power pack for my ebike using chinese 18650 clones suggestions?
Replies: 11
Views: 477

Re: Making a cheap power pack for my ebike using chinese 18650 clones suggestions?

Its cheaper to buy from tumich here... some good chinese cells cost about 1 usd for 2200. Imr clones. They probably have half lifespan and reliability of pasanobic battries.they will lose rage after 100 cycles by my experiene. Get some tumich listed ones here.
by zzoing
Jun 16 2018 2:44pm
Forum: E-Bike Technical
Topic: Are all IRFB4110 MosFET's the same?
Replies: 1
Views: 194

Are all IRFB4110 MosFET's the same?

I have to buy a new IRFB4110 for an infineon controller, are any of the random ones on eBay ok?

what's the differences? I figure Infineon makes their own versions, what about generic ones?
by zzoing
May 24 2018 3:10am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1581
Views: 165723

Re: Thread for new battery breakthrough PR releases

It's actually usable for a 2400 watt ebike.

.5C is 6W (=.5*4v*3Ah). although they are recommended for 1C continuous discharge, which is 12W. So, for 290grams, you get 120Watts, and for 6 kilos of them, you get 2400watts, and 2400 Watt-Hours too!!!
by zzoing
May 23 2018 5:59am
Forum: E-Bike General Discussion
Topic: PodRide
Replies: 30
Views: 2545

Re: PodRide

So, the Podride is now funding on Indiegogo and there's another video for it:

https://www.youtube.com/watch?v=4lKq1fGtXFM
by zzoing
May 23 2018 2:54am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1581
Views: 165723

Re: Thread for new battery breakthrough PR releases

Can you find a price quote? News: Toyota, General Motors, Daimler haven't contracted them... So, there must be an issue with the batteries. Someone can try them in a quadcopter already? Perhaps they are not powerful enough for RC and drones. It's totally usable for a bike the graph states 0.1C charg...
by zzoing
May 14 2018 3:43am
Forum: Battery Technology
Topic: Cordless Tool Conversion
Replies: 29
Views: 5506

Re: Cordless Tool Conversion

Haha, cool thread! I got a hoover for my car. 3.6v nimh, 5$. As new, Black & Decker dust devil. it could barely hoover a grain of rice for 10 minutes. I put in 4x 18650 cells, an Ecig board for a 4.2 lion, and a USB plug. Ok it will take all day to charge the hoover, but it can hoover stones and it ...
by zzoing
May 11 2018 12:55am
Forum: E-Bike Technical
Topic: Turnigy Rotomax 50cc Speed Control Options?
Replies: 2
Views: 348

Re: Turnigy Rotomax 50cc Speed Control Options?

You should post a photo of the motor that is already on the cart, are you the first on the web to mod it?
by zzoing
May 11 2018 12:50am
Forum: E-Bike Technical
Topic: Need help with battery box
Replies: 2
Views: 318

Re: Need help with battery box

Make sure you have a multimeter so you can check polarity of everything if you wire it yourself. Sounds like a good learning project.
by zzoing
May 10 2018 8:35pm
Forum: General Discussion
Topic: All-Axle Grin Hub motor meets Haibike FS RS 27.5
Replies: 67
Views: 7618

Re: All-Axle Grin Hub motor meets Haibike FS RS 27.5

That's a weird axle. Perhaps there is space to fit in some heat pipes through the axle.