Endless Sphere

The outdoor demo is about half the size of the outdoor demos I went to back in Las Vegas. That being said, I like it better. A lot of big names didn't show up, but I think this will grow fast. In Las Vegas Interbike was "just another convention", but here, everyone is very happy to have the bike peo...

I carry a tiny flashlight for maneuvering a dark room when someone else is there I don't want to wake up. At the moment I turn it on, I cover the LED bulb with my thumb and only expose the bare minimum to accomplish my task. When I was a young man in the Navy, I found out that some people are quite ...

I think it's very useful to have a sensorless controller as a backup, and also as a trouble-shooting tool. By that I mean, if your motor develops a serious problem, then swap-in the sensorless controller. If it then runs fine, then at least you know the motor phases are OK. Another benefit is for th...

Can be shipped with zero volts, so no hazardous shipping regs.

https://www.youtube.com/watch?v=WkgZW2n ... e=youtu.be

[youtube]WkgZW2nvYJs&feature=youtu.be[/youtube]

You can order nickel ribbon to be laser-cut to any shape. The four squiggly thin connectors to the centers on the right half are the "fuses". Plate shown is 2S / 6P if you don't add anything else.

It's almost impossible to spot-weld copper directly onto the 18650 cell ends. The cell tips are nickel-plated steel. However the path through the 18650 shell is thin. Nickel spot-welds easily, it's high resistance creates very hot spots precisely at the points where the welder probes are touching. N...

HA! Posted at 6:00 and 6:02...we were typing at the same time.

I am a fan of overlaying copper on top of nickel, with the nickel only providing the easy spot weld.

The more conductive a pathway is, the less heat is produced from a set amount of amps. It only the heat that makes the spot-weld. In fact, this is the reason you are adding more conductor mass to the series connections. Your desired amps would create too much heat with only one layer. By adding a se...

It was my understanding that when a direct drive hubmotor is shown on its side, the "H" is for the "Height" of the lamination stack. If you visualize the hubmotor in its vertical normal orientation when it is mounted on the bicycle, we might call it the "width" of the lamination stack. It designates...

Luke is incredibly busy, and I don't want to speak for him. However...he has stated many times over the last few years that he prefers lower voltages and higher amps. The lower the voltages, the better the efficiency of the components, which has fewer waste-heat losses. Of course, as Fechter just sa...

I really like these a lot. hexagonal end-caps have been discussed before, and I am very happy someone is now actually producing these. I had previously thought that I would have wanted to build a pack out of all sections that held two cells (with the last row using single-cell pieces), but I think i...

The biggest disadvantage I can think of is that there is not a big selection of 72V battery packs that are ready-made for sale. If you are building a pack from scratch, then you can choose any voltage you like, any cell brand/model, and any shape... 48V / 52V ebike battery packs can power a common i...

I found the safety tests at 4:20 to be very interesting. The future looks good.

https://www.youtube.com/watch?v=kJXRyWQgOY4

OK, it looks like I'll be going. Anyone else going to be there?

What are the physical dimensions of one cell?

I see that it is 26S, does it look like it would be difficult to split the pack into two 13S / 48V packs?

The last few years the Nissans have had serious transmission issues with their version of a CVT. Normally I am a fan of Nissan products. Here are the ones I'd check out, any one should have a much better than average reliability record. Honda Fit 2018 $16,190 Kia 2018 Soul $16,200 Mazda 2018 MAZDA3 ...

How many cells were you planning on using in your pack build?

Thanks for reminding me!

I have to agree about monitoring temps of the cells. If you want to distinguish yourself from the rest of the internet cell testers, I don't know anyone who has been listing the cell temperatures at the various amp-draws. Since 140F / 60C is a hard ceiling for 18650 heat, I am curious about what amp...

Thanks for posting your experience. As battery packs become harder and more expensive to ship, individual cells remain fairly easy to ship, so I can see there becoming a growth in locally-built battery packs.

Thank you Frank, I now realize I did not properly understand that.

Since the replaceable tips are pure soft copper, it's possible they could bend a little with enough downforce. If your experiments indicate that you need to apply significant downforce of the electrodes to achieve the type of spot-weld you like, then they should be mounted as vertically as possible....

If you want to build a portable suitcase power back-up, it might be worth experimenting with a 7S / 24V pack. You could add a small sine-wave inverter so you have 110V AC, and of course a small and cheap step-down DC/DC that outputs 12V so you can charge your laptop and cell phone. Two 12V solar pan...

"Building a DIY triple stator axial flux motor" (Lebowski, 8 pages) https://endless-sphere.com/forums/viewtopic.php?f=30&t=46476 "Lebowski's motor controller IC, schematic and setup manual" (Lebowski, 48 pages) [plus index in first post, to all Lebowski threads] https://endless-sphere.com/forums/vie...

This is not a big bicycle state. If a guy is wearing lycra, they laugh at him, and if he is wearing jeans, they assume he has a DUI. I mean, who would ride a bicycle if you own a car, right?