Endless Sphere

To be clear, you want to measure the resistance of each 14S1P string? Or each 1S20P group? Not sure how your pack is configured. Basically, you can estimate current using I = V/R. I usually use 2C current for measuring DC resistance. If your current is too low, the voltage drop is too low and your a...

Looks like a lot of fun. I agree that increasing the maximum lean angle is a good idea. I think a cornering video that's not from the riders perspective would be cool to see.

jvm37 wrote: ↑

Nov 05 2019 5:04pm

Paul I have sent you a couple of emails
I am interested in buying one of your kits
Please take a look

I just checked my spam, and I'm not seeing your messages. Which email address did you send them to? Maybe the web contact form is broken. I'll test it out.

This is great, stellar work!
How much front suspension travel? Have you searched patents to see if there is any risk in violation if you bring it to market?

For the benefit of the community, I'll summarize our email discussion, firstly, here were the suggestions on battery protection parameters. ASIerrors.png Then you had instantaneous undervoltage errors due to incorrect SOC algorithm parameters, since you are using the ASI battery protection scheme. N...

1. Look into Ligo bricks from Grin. Ligo bricks are 36V. He needs 48V. 2. SFAIK, batteries installed in a sealed, rigid enclosure are somewhat easier to comply with shipping regulations. 3. My battery was in such an enclosure, enclosed in a bag, then placed in a box full of what appears to be Vermi...

Just a few updates: -Luna Cycle was not willing to provide me with a UN safety certificate, so I wouldn't really be able to re-ship one of their packs. -An unnamed vendor was willing to provide the UN safety certificate, but for a much smaller battery than what I was asking for. They said that when...

I have another idea: Why bother welding at all? I already mentioned using some reflow solder paste between the nickel or copper and the cell. As the weld is made, it creates a lot of localized heat. Enough heat to melt solder and short enough duration to NOT heat up the cell. This may be a great wa...

I have contacted Hesse Mechatronics and hoping to get a decent price soon, but there are a few cheaper Alibaba types such as Minder Hi-Tech. I think they started at $60k. Cool, I wonder if Minder is any good. I was hoping they would be significantly cheaper than US and EU machines. Let us know what...

If we knew the specific heat capacity and DC IR of the above 18650 cell we could work out the total cell heating and compare it to that predicted by simple ohmic heating - approximately - on account of heat loss due to imperfect insulation, heating of box interior etc. It's been a while but I recal...

Has anyone been charged any tariff in these product categories yet, at all? The tariffs only apply to shipments over $2K (or is it $2500?). And it seems to apply to country of origin(manufacture), not where it is shipped from. Is CYC manufactured in HK or mainland China? I had to pay tariffs on a l...

I recall them starting around $70-80K USD. That size you are looking for would be more $$. This was at 5 years ago.
In my past job, we looked at Hesse, F&K and K&S.. then decided not to use cylindrical cells
What does your company build?

Wish they'd make an open (non-Bosch) version. Big hills + heavy loads need lots more oomph The Sweet Curry makes for a great conversion. Lot's of room for battery. I can cruise at 22-25 mph with 450W, but less when fully loaded up. A bigger mid-drive should do it. The small rear wheel leads me to u...

It's nickel, stainless steel and copper. I asked if he could send me a sample of it so he sent me 12" of it. He has no supply yet so this with a lot of his very limited stock. As expected the .3mm nickel has the lowest resistance. But check out that .1mm thick alloy! Not much more resistance despit...

john61ct wrote: ↑

Oct 14 2019 8:08am

I also would like to find a freelance professional willing to tune these controllers to a given motor.

I've been considering this for a while. I've spent a lot of time tuning for a few different motors. Feel free to shoot me a PM.

Ecyclist wrote: ↑

Oct 06 2019 10:37am

I built a drive for myself. In two days I will by flying with my set-up to Japan.

How are you going to get that bike on the airplane?

If you share your XML parameter file, some people might be able to have a look at it and help you.

The problem with adjusting the gearing by 1.4X is that the top speed of the motor would be too high. Do you mean with respect to heating and wearing down of internal pieces? Makes sense. 40% is significant. So there is no safe workaround to internal rewiring. Efficiency, heating and wear, and risk ...

Ok, I finally had time to get some pictures of my sprag experiment. I think the outer ring might not be stiff enough, but testing will prove that out. One might think it's an advantage to have a larger diameter, but it requires more material to achieve sufficient stiffness. This is about 200g heavie...

Instead it has a single magnet on the end of the motor pinion gear which is located behind the shinny circular post just behind the 3 phase plug. This means you will need to take care refitting the speed controller cover as I presume there is a sensor on the speed controller circuit board that pick...

I emailed Luna about the weight on the product page. They said when they weighed their bike in the shop it was 49lbs. I asked if they could put it on the scale again to verify. They responded back the medium is 55lbs and there's no way to make it lighter, lol. My gut tells me the shop was too busy ...

There was no status light then or now. In my experience, no status light means either a cell or two below minimum voltage or a bad BMS board. Did you measure a voltage on the terminals? Return shipping will be an issue since a battery that size needs to ship fully regulated dangerous goods. They sh...

I understand 52V would work with your motor, by reprogramming the controller, but with sub-optimal efficiency. Am I correct to assume that the motor would then spin 14/10 times faster unloaded? What kind of efficiency loss are we talking about, at constant speed and load? (assuming it is easy to ad...

CYC has informed me that the black 72v torque sense version will be shipped soon, the version I'm getting. I can't wait to post progress pics of my build for you guys, I have a cycle analyst 3 installed so I'll be tuning optimal settings for that to make up for the weaknesses in the beta app. Here ...

I chose the middle ground for optimum cadence. Early prototypes favored lower pedal speeds, but some beta testers wanted more power at 70-80 RPM, so I decreased the final gear ratio a bit. Savvy users can adjust the gear ratio by changing out the sprockets. The #25 front final drive sprocket is a st...