Search found 10012 matches

by spinningmagnets
Nov 20 2018 8:30pm
Forum: E-Bike Technical
Topic: Mobipus Controllers
Replies: 109
Views: 10955

Re: Mobipus Controllers

I compiled the information I could find on Mobipus into an article. I welcome any corrections...

http://www.electricbike.com/mobipus-controllers-shenta/
by spinningmagnets
Nov 20 2018 12:20pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 185
Views: 23211

Re: Spot Welding Copper Strips to 18650 Battery Cells

"...people in my office says individual cell can failed and affect the others..." If one cell in a 5-cell parallel string experienced an internal short, it will get very hot very fast, which will make the short larger. It will quickly become as if that cell was removed, and replaced with a thick cop...
by spinningmagnets
Nov 20 2018 7:50am
Forum: Battery Technology
Topic: Friendly reminder. Winter (@northern hemisphere) is kickin' in.
Replies: 5
Views: 194

Re: Friendly reminder. Winter (@northern hemisphere) is kickin' in.

Also, any device with an LCD screen should not be left out where it gets well below freezing. Cell phone, laptop, digital multi meter DMM, some chargers, voltage readout on battery pack, electric bike dashboard, etc...
by spinningmagnets
Nov 20 2018 7:48am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 185
Views: 23211

Re: Spot Welding Copper Strips to 18650 Battery Cells

Part of the reason that Tesla added an individual cell-fuse to their design was because it allowed them to remove some of the standard internal safety features in order to slightly increase the Amp-hour volume of the active material. Another reason is that some of their cars are likely to be in a cr...
by spinningmagnets
Nov 20 2018 12:05am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 185
Views: 23211

Re: Spot Welding Copper Strips to 18650 Battery Cells

This is an example of several ideas I have been growing fond of. Honeycomb layout of cylindrical cells copper bus-plates for high conductivity and heat sinking/radiation of amps heat nickel tabs to connect cell-ends to bus-plate By connecting the nickel tabs to the copper bus-plate before you spot-w...
by spinningmagnets
Nov 19 2018 9:31pm
Forum: Motor Technology
Topic: Brushless motor efficiency
Replies: 11
Views: 256

Re: Brushless motor efficiency

Luke, if there is one thing I have learned from you it's that...if I have a big enough motor using enough amps, I won't be accelerating for long, I'll be up to cruise speed in a very short amount of time.
by spinningmagnets
Nov 19 2018 9:18am
Forum: E-Bike Technical
Topic: What upper limit Voltage is this Controller capable of ?
Replies: 5
Views: 95

Re: What upper limit Voltage is this Controller capable of ?

A lot of programmable microchips run off of 5V-24V, so it is likely the 24V labeled cylinders are capacitors for that circuit. The larger 100V labeled cylinders are likely for the power circuit, and A fully charged 20S battery using 4.2V per cell is 84V (and 20S is generally regarded as a nominal "7...
by spinningmagnets
Nov 18 2018 8:04am
Forum: E-Bike General Discussion
Topic: Buying a bike helmet for my son
Replies: 7
Views: 134

Re: Buying a bike helmet for my son

For my kids (years ago) and my grandkids now, I have allowed them to select their own helmet (rather than gift them one they may not like). Having them pick it out seems to make it more likely they will wear it when I am not around. They all seemed to like skateboarding helmets, and my grand-daughte...
by spinningmagnets
Nov 18 2018 7:50am
Forum: Battery Technology
Topic: Bosch Batteries
Replies: 16
Views: 1216

Re: Bosch Batteries

I understand that Bosch is trying to create a system configuration that meets their needs. They are a huge seller of street-legal ebikes. They do not want anyone to bypass power restrictions or use non-bosch parts. In order to maintain a dealer network, which supplies the hands-on FTF customer suppo...
by spinningmagnets
Nov 17 2018 6:58pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Ideal scooter specs, does this exist? Or will it be diy?
Replies: 16
Views: 481

Re: Ideal scooter specs, does this exist? Or will it be diy?

The 30A BBSHD runs fine on the EGO 56V pack, but of course it only has 7.5-Ah of range.
by spinningmagnets
Nov 17 2018 4:41pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Ideal scooter specs, does this exist? Or will it be diy?
Replies: 16
Views: 481

Re: Ideal scooter specs, does this exist? Or will it be diy?

I am a fan of 48V / 52V systems because they can power an inverter to produce 110V AC during a power outage.

I am surprised nobody sells power skateboards and stand-up scooters using cordless tool batteries. 18V, 24V, 36V, also seriesed 18V for 36V, and my favorites are the EGO 14S / 52V
by spinningmagnets
Nov 17 2018 2:17pm
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 26
Views: 668

Re: New 14S7P pack need advices (to climb high mountain)

When deciding to overlay more nickel to help reduce resistance, keep in mind that the high flow of current is along the series lines. The parallel connections between the cells can be very small. Here is a 5P pack below, and the motor / controller will be drawing 25A peak. The red arrows show where ...
by spinningmagnets
Nov 17 2018 12:46pm
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 26
Views: 668

Re: New 14S7P pack need advices (to climb high mountain)

Since you are using a 10A rated cell, the 30A of the stock BBSHD controller means you will be drawing 4.3A per cell, which is well within their capabilities, so the cells should not get hot. This also means the 0.30mm thick nickel bus plates will be more capable than needed, which is good. The two e...
by spinningmagnets
Nov 17 2018 7:53am
Forum: Battery Technology
Topic: New 14S7P & 14S5P packs need advices (to climb high mountain)
Replies: 26
Views: 668

Re: New 14S7P pack need advices (to climb high mountain)

That set-up is very well done! You mentioned that you will be using the BBSHD. Will you be using the stock 30A setting? or the upgraded 50A controller? For a long climb, the best advice I can give you is to use a smaller chainring. Since I am happy with 25-MPH (40 km/h), then I am using a small 30T ...
by spinningmagnets
Nov 16 2018 2:00pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 28
Views: 495

Re: A portable gasoline generator for long range

I'm not suggesting that a push trailer is the solution for this project, but they do exist:

https://endless-sphere.com/forums/viewt ... f=3&t=9855
by spinningmagnets
Nov 16 2018 8:24am
Forum: Items for Sale - New
Topic: kWeld from Keenlab now available in the US
Replies: 22
Views: 2419

Re: kWeld from Keenlab now available in the US

A 3D printing file of an electrode holder is available and free to use, designed by Shannon Williams. The probes in the picture below are the stock probes from keenlab in Germany.

https://secondlifestorage.com/t-Easy-to ... sing-files

kWeldHolder1.png
A
kWeldHolder1.png (951.76 KiB) Viewed 79 times
by spinningmagnets
Nov 15 2018 9:07am
Forum: E-Bike General Discussion
Topic: Some comedic relief for you all.. folded lunacycle BBS02/HD wrench
Replies: 18
Views: 584

Re: Some comedic relief for you all.. folded lunacycle BBS02/HD wrench

Since ten bikes had been built using this particular wrench, it works as a general purpose BBSXX tool. There are also beefier sockets on the market, and for an obstinate subject, I'd definitely use the socket Start with a good penetrating fluid. If you are in a pinch, I've also seen acetone and ATF ...
by spinningmagnets
Nov 15 2018 8:33am
Forum: E-Bike Technical
Topic: Battery builder concerned over building a Luna Mighty Mini Clone
Replies: 8
Views: 166

Re: Battery builder concerned over building a Luna Mighty Mini Clone

The 30Q cell is rated for 15A each, and I use that number as the peak when choosing a pack. A small 2P pack would not get hot if drawing 20A. Some of the popular max-capacity cells are publicly rated for 10A, but they get pretty warm if they actually draw 10A frequently, so for those cells, you woul...
by spinningmagnets
Nov 14 2018 2:47pm
Forum: General Discussion
Topic: Auto Ranging DMM
Replies: 7
Views: 181

Re: Auto Ranging DMM

It's good to have two DMMs, one that's cheap enough, you don't mind too much if it gets broken or stolen.

There's a thread in the stickies about DMMs. Some good selections for $25 up to hundreds

viewtopic.php?f=14&t=66127#p995111
by spinningmagnets
Nov 14 2018 12:33pm
Forum: Battery Technology
Topic: Compression of Li-ion cells is good - but not too much
Replies: 6
Views: 348

Re: Compression of Li-ion cells is good - but not too much

When I was reading about lithium pouches that were used for racing, I recall that having the flat sides compressed improved the peak amps, and also reduced puffing. They knew they were beating on the cells, but they wanted to find out how light they could make the pack, while still drawing "X" amps....
by spinningmagnets
Nov 14 2018 8:13am
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1761
Views: 540896

Re: Your Creation's Before & After Pics

Hey, Lenk. Your build definitely deserves it's own article. I'll consider this permission, and I'll get right on it! I am surprised that I forgot to add Simons Specialized to that index, since I already wrote about it (he has now been added to that index). https://www.electricbike.com/specialized-su...
by spinningmagnets
Nov 14 2018 7:41am
Forum: Battery Technology
Topic: 13s4p vs 13s3p
Replies: 3
Views: 131

Re: 13s4p vs 13s3p

I believe as long as you keep the TSDZ2 in the proper gear and don't bog it down, then either pack would work fine.
by spinningmagnets
Nov 14 2018 7:38am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1367
Views: 156058

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

If i compare the 5T 1500w leaf to something like the MXUS 3005, the 30mm MXUS put's out about an extra 35 rpm in the simulator The narrower stator has a shorter length of wire in each turn, which affects the kV. Do you know if all the benefits from this Leaf 1500W are applicable to the 1000W versio...
by spinningmagnets
Nov 13 2018 5:48pm
Forum: General Discussion
Topic: gas price thread
Replies: 717
Views: 47500

Re: gas price thread

The federal highway tax per gallon is the same. The state fuel tax is low on Kansas. I think it's around $8/gal in the Netherlands.

Kansas is a low population density state. A high percentage of voters here are in some way involved with farms and beef-cattle.
by spinningmagnets
Nov 13 2018 9:58am
Forum: Electric Aircraft
Topic: Farfles Electric Ultralight.
Replies: 184
Views: 15479

Re: Farfles Electric Ultralight.

Well done, Jackson! Congratulations.