Endless Sphere

. Nice charts I love them! Thanks alot for it! MJ1 so cool new cell that give you epic and long performance life. I'm stuck with my used PFs but it could be worse if I had used my used and old Sony V3 10A capable in my latest battery build, cells who have degraded down to only 1800-2100mah which wh...

Two ideas I got apart from starting small and then taking on the harder projects. (Free house energy first before doing it at work, or commuting to work for free) A portable tower / winch using electricity or grid by cable. Just move it sideways on one end of the field and drag out the cable and sta...

... Most of the packs measure around 3-4V per cell, with several packs around the 1V range and one pack that is dead flat. Like 0.04V per cell. Maybe the BMS ran it flat? ... Any suggestions welcome. The 3-4 volt ones are OK, good. But do really let go of the bad cells or use them as "learning...

Check all wires and connectors. Try check the fuse in the battery. Most batteries have a bms that monitor power outtake and charging so that may be why it shut off after over-current protection set in in your full throttle up a hill episode. Usually this function will reset itself after a few second...

I really wonder what benefit this does in actual numbers So two of the phases has wires going outside the Amp-sensor. If the phase wire is the same thickness and length as the original "not phase wire being bypassed" then would it be true the power would be +50%. Does this mean peaks are 5...

I re-ran the test, rather than using 15-25 amps for test given current for hall sensor test, I went all out and tried 45 amps. now it passed. I changed it after realizing that at 15-25 amps it wasn't even turning the stator, just a lot of coil whine. With the other controller, even at 15 amps hall ...

Making another pack. This one has 25p because the cells should measure up to 66ah and so one more is needed in each group beacuse of lower cell capacity.
Difference with this module is that I'm trying more copper in the series connections. 8 instead of 4-5

Check out VTC5A if you haven't. I came across a graph showing it had higher voltage all the way until emptied @ 20A

Graph here 2,39 in the video:
https://www.youtube.com/watch?v=fZC_bWXrACo

As for 30C rated cells, don't confuse C with A, many people call 25R a 20C cell when it's a 20A cell with 8C... Hey RG I have some cool info. I tried 10a rated cells, Panasonic 2900pf cells at 24p. Build with copper wire on the series connections. In comparison to some old turnigy multistar 12C 20a...

So the black on the high speed low speed dongle needs to be connected directly to the negative on the 72v battery? If anyone has their high speed low speed connected and working please let me know how you did it No I don't think so. I had to change some settings turning off some in the bluetooth Th...

...So the cell specs call for a .22V voltage drop between .2C and 2C rate. For 5S, that's 1.1V. Interpolating the test results for .2C load, .2*72 = 14A. The observed pack voltage drop at 14A, about .2V, so the perfect world drop is 1.1+.2=1.3V versus the observed 1.9V, a .6V delta. Plus it's reall...

you need way more copper on your bus if you wat better performance. same goes for the inbalance during load. you need way more beefy series connections. What happends when I double or tripple the bus bars? Better performance... Pack module cable are short 10awg 20cm and battery cables are oversize ...

Ok, so if we say that i will have the pack pre-heated to 20c or so before riding off, and ignoring the very few times i'll have to park it outside in the cold, does this change anything as far as what cells are recommended? I see some of you recommend NCR, and some say forget the GA, so i'm a bit c...

Just tested module one 5s24p with panasonic PF cells. They have a delta voltage between cells in the module below 0,11v at 3,95v and 150a load. Maybe I didn't balance them so it could even be lower. (Delta voltage between cells at no load was 0,005v) However. Total pack voltage at testing was 19,75v...

It would be easier if you mesured one cell group at a time, to get the voltages. ... Hi Leffex, With this low voltages of my pack.. Except for the bms, do you think any of the batteries still can be used, or should I consider it as total loss? Greetings Bas I think you should double check voltages ...

I searched for a box that fits the space I want to use and put my battery into. I can put 4 of them into my space so I started with ordering 2 boxes to try. Ordered another two from here: https://www.aliexpress.com/item/33004388619.html?spm=a2g0o.cart.0.0.77773c00w03GYq&mp=1 How do you find the ...

In this picture, the iron connection part on top is a little loose, when I press it, I can see it touch and untouch. Could that.. Be.. The.. Reason? EDIT: More pics of other side of the Pack. You need to repair it if its broken or it may cause danger in the future if you let it be. You use alot of ...

I saw it too.

I guess you still need all the normal extras

Another pack mocked up for photos: https://i.imgur.com/7MzkxJc.jpg https://i.imgur.com/q5RSl0X.jpg Module 2 pack stats: 18,5cm*7,5cm*30cm = 4162cm^3 Volume = 4,162 L 5s*26p 26F nominal 1196wh 1196wh / 4,162 L = 287wh/L Power rating 26p x 5,2a = 135,2A I'm thinking about what these modules can give i...

High average consumptions is 63w energy used per km in distance

But I like that I use alot less (I have a higher efficiency) while accelerating and when using higher power but not so much in slow riding conditions rather than other positive aspects.

A sidenote ... Yeah that is pretty interesting. thanks! What I mean it is pretty good to get 5% more range after fixing new cables? estimate and guesses I have RC cells but replacing with 5s24p 18650pf block. So it will get 2,4x less resistance than you calculated :P https://endless-sphere.com/foru...

Hey I want to know what benefit I get from thicker phase wires vs original thin wire in performance measures. Also positive and negative battery wires are replaced. I know the resistance in the wire is less and the voltage drop is less because of that. What performance gain in power and effeciency d...

Something like cylindrical or 6squared plastic cell holders. The ones I used was 1x4p so I added them together and broke some to make smaller pieces were needed These are very alike but not the ones I have https://vruzend.com/product/hexagonal-18650-battery-holders-3-cell/ I first thought not of usi...

Work table: https://i.imgur.com/o3WyCNJ.jpg 1 of 5 pieces https://i.imgur.com/8rObp1F.jpg 5 pieces fits inside one https://i.imgur.com/OHpeWNe.jpg Finished pack: https://i.imgur.com/ONDnoex.jpg https://i.imgur.com/6ZqiWck.jpg Module pack stats: 18,5cm*7,5cm*30cm = 4162cm^3 Volume = 4,162 L 5s*24p 2,...

just search elcykelkit nor elcykelbatteri and you will find front wheel motor or battery in Sweden with warranty.

Tax for buying outside eu is + 3-8% for ebike parts into Sweden and +25% tax on that aswell as +100 sek fee for handling.