Endless Sphere

The repaired axle survived today's work commute. I might have time Wed or Thu to work on rewiring it again.

I think I have a workable idea for a complete axle replacement using a tube with a tube clamp, and larger ID bearings with same OD. Gonna put it in my trike thread once I sketch it up.

I'd assume they start in the right gear. ;) Other ways to prevent it: Increase chain tension so it can't lift up over the teeth. This then wears the chain out faster at the pins. Increase derailer spring tension so it keeps the chain wrapped on the sprocket. This may make it harder to shift. (much h...

I don't want to dissuade you from trying, but to be realistic, it is quite a challenge to do this from scratch, with no knowledge at all of how anything works. Even people that already know quite a lot have had tremendous problems getting their controller designs working. It's not just about a schem...

No. Adding a set of charged cells in series with a discharged battery doesn't get you anything; the discharged battery is still discharged and still has to be recharged. EIther: Get a bigger battery (more Ah, same voltage) to replace the one you have, Or add a second battery in parallel with the fir...

This system seems to have a harness that leads to a set of other wires which is why I have attached a second picture below. There is no second picture, and nothing is attached. There is a single link to a site that gives me just a blank page except for thumbnails that couldn't be related to your po...

Hi, I'm building an electric go-kart using the MY 1020 motor or maybe a clone of it. But unfortunately, I can't seem to get the motor to run at all. Not even powering up. Unless yours is a type I have never seen, the MY1020 is a brushed motor (only two wires), so it is incompatible wiht the control...

YOu might want to read around the forums; there are a lot of existing threads for such things. One example search for no-weld solutions (no-weld isn't findable due to the "no-" but weld is, so easy to look at the titles....) https://endless-sphere.com/forums/search.php?keywords=weld&terms=all&author...

And then once you build the motor, you then have to build a controller for it, and that will probably be even harder and more expensive than the motor to design and construct. You would probably be better off to find a wrecked EV of similar capabilities to what you want your car to do, and use it's ...

butters149 wrote: ↑

Mar 18 2019 1:47pm

Hello, does anyone know what plugs these are? They are used to connect to my headlight.

Since you have not attached an image or provided a link to your kit, we have absolutely no way of knowing what plugs you are talking about.

his only concern (not one in my mind) is that the spokes and rim arent up to par. Most of the kit rims I've seen and owned are inadequate for the spoke gauge used; typically they use 12g spokes on the cheapest bicycle rims they can get, so the rims are not strong enough to hold the spoke tension ev...

I don't live in a big city and have to drive through rural area where there is no power outlet. :( https://endless-sphere.com/forums/search.php?keywords=range+extend*&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search https://endless-sphere.com/forums/search.php?k...

tomgda wrote: ↑

Mar 18 2019 4:29am

Bike 100% efficient

Nothing is 100% efficient.

If you want to claim an efficiency, you should test it and post the testing procedure as well as the results in various situations, as it will have different efficiencies under different conditions.

If the old controller is identical to the new one, then AFAIK (Based on implications of several threads around ES) you can download a DVT file from the old one, and upload it to the new one, to set it the same way. I don't know if there is anything special you have to do to accomplish this, or to en...

higher gears have less sprocket teeth engaging the chain in the back, so the harder the chain pulls on it the more likely it is to slip.

One big pack is easier on the cells.

I disconnected the CA's throttle output, so only the hand throttle is runing the SFOC. Easier to control exactly what power it makes then, but it does still get the judder, and the shutdown (and once an overcurrent, when the below happened) error code, if I do push throttle too far up while above ar...

They just engage whatever braking method the controller has enabled / programmed, whether that be simply stopping motor operation, or regen, or eabs, or some other thing.

Hall sensors don't output any voltage, they only short it to ground when on, and the output is floating when off. A pullup resistor (usually to the 5v source) inside the controller on each signal line brings the output up essentially to the supply voltage. If you disconnect the halls from the contro...

Hi all i'm building a high powered e bike. I am unsure if normal bicycle disc brakes will be enough to stop me if i'm going high speeds. Depends. What do *you* call "high-powered"? What do *you* call "high speeds"? What is the total mass being stopped? What kind of tires/wheels? (if there's not eno...

With Lithium packs, the Peukert effect is negligible. But even if it wasn't, you would need to discharge it at the rate you will be using it at in order to determine the actual usable capacity. If you test at a lower rate and it gives a higher capacity, that capacity is irrelevant, because you could...

More testing on my commute today, and then a little more on a side trip to the store on the way home. If I turn the Cycle Analyst's speed limit down to 5mph (so it doesn't output any throttle above that speed), and use only the thumb throttle to control the SFOC/4503, then I can avoid the error 10 /...

So I know I'm showing my ignorance here but that's 20 total 18650 Panasonic 18650 3400 mAh 3.7v batteries in four parallel groups. 20s means twenty cells in series. 4p means four sets of series cells placed in parallel. So you would need 20 * 4 = 80 cells to make a 20s 4p pack. As to whether that w...

So I was right.

I highly recommend crimping them, if you can get a good enough crimper. Otherwise, I would strip the wires to the length that will fill the contact's cup, interleave the strands of any multi-cable sets that use the same contact, and fit the strands into the cups, then use a heat gun on just the cont...

some guy on Amazon is selling a 10 pack of Pansaonic 3400 m ah 18650s for $80. But how many of those would I actually need to get to a usable 72 volts? At what current? You need to determine the max current your controller will ever draw. Then you need to determine the max current the cells themsel...