Endless Sphere

Aka check the vaue of your controller (Max amp draw), multiply by 1.25 or 1.5 and chose that amp value for BMS

A guy burnt his 250W moter using 14S battery, but running 35Amps !!! Here's his result : https://etrike.wordpress.com/2013/05/12/my-bafang-lost-its-teeth/ And here's his initial story : https://etrike.wordpress.com/2012/08/09/my-bafang-is-up-for-a-little-overhaul/ https://etrike.wordpress.com/2013/...

You can. The opus will charge each slot with 1A current. This current is low enought to not overheat your small BMS wires... So yes you could technically do it. But this is temporary and wont fix your defective cells.

Also, pulling 110A through 8 of these is pushing it too far... 14Amp throug each 8mm x 0.15mm nickel strips is very likely to generate much more heat than the discharging cells themselves from their intrinsect internal resistance. The nickel strips can take 3.6amps .... maybe 6 to 8 amps for short b...

All welds are in place, physically brand new. Could it be maybe loss of conductivity from the nickels? Is there such thing? each cell is connected with 8mm wide 0.15mm thick pure nickel and 20Ah is 8 cells in parallel No. Nickel conductivity will not change over time. The conductivity (which is the...

Ever day for 10 months = 305 cycles.
How deep of a discharge cycle each day ????
If it's close to 14A per cell and 305 full cycles, than yes I would expect that kind of lifespan, but that's just my opinion...
Matador

I changed my erBike front light to this https://www.amazon.com/Greenergia-High-Brightness-Headlight-Universal-Spotlight/dp/B07C7G5QWR/ref=sr_1_fkmr0_1?ie=UTF8&qid=1538862402&sr=8-1-fkmr0&keywords=High-Brightness%2B1600%2BLumen%2BElectric%2BVehicle%2BHeadlight%2BWater%2BProof%2B36V%2B48V%2B60V%2BUniv...

If you need that strength to jump your bike, you'll just break the key that secures the gear set. You can't do a lot of hucking with the geared motors. But happily, replacing that key is pretty easy. If the key doesn't shear like it should, then you might wreck the clutch. When you do catch some sm...

With all due respect. I think these consideration are not really relevant. I used Sn60Pb40 solder, which has a melting point of 188°C (370°F). There is absolutely no way I will ever bring these cells higher than 50°C during their cycle life, even if I pull very hard on them. If you think about it o...

From looking at the first video that I link in the start of this thread about the motor, I am now convinced that the moter uses three 28 teeth planetary gear. The largest gear in the housing has 74 teeth and the centrat gear has 18 teeth. So in theory, this geared motor has a ratio of 74/18 = 4.1 to...

A relatively large, soft, semi-liquid contact might actually carry a greater current than those tiny poorly bonded welded contacts depicted in the photos of the OP. As I noted previously, the technology available today in regards to soldering, is MUCH improved over my lifetime. While coppers have a...

I would not use that battery if they would pay me. No way to know if the cells are legit brand name. Imbalanced poorly matched recycled cells could result in a fire. Burning a house down is not worth saving 100 or 200 bucks. Buy from em3ev. It's the best IMHO for prebuilt batteries and the prices ar...

https://endless-sphere.com/forums/download/file.php?id=241412 That looks great for conductivity but bad for brutalizing the cell with heat from soldering. Totally agree. But this pack costs less than a spotwelder itself would cost me. 107 USD for 60 cells. 14S4P Battery (439.5 Wh 52V 8.6Ah LG MF1 c...

Arent Lithium thionyl chloride batteries non-rechargables ?

OMG , I just tryied my overvolted bike for about 20 km. I have a XT-60 for both the original 10S4P (36V) battery and my new custom made 14S4P (52V) battery. I tried both battery on the same long strip of riverside bike lane tonight. Both batteries fresh off the charger. With the original 36V (charg...

Finished homemade 14S4P Battery (439.5 Wh 52V 8.6Ah LG MF1 cells):
Matador

180 Buck for an LG-Chem 52V 14S 8.6Ah 440Wh max:40A battery is hard to beat IMHO. Now a bit of padding and I should be able to test my Overvolting project in real life conditions.... Battery is holding charge at 58.9V right now (my DMM meter is always reading 0.1V more ...) Hope my controller doesn'...

I noticed my ancheer eBike has been dropping the chains a lot lately. And the chain anoyingly got stuck between the chainring and bashguard. I had to use a tool to pry the chain out every time. This all happened after I crashed with the bike at around 25 km/h. I guess I bent something in the process...

Copper is 0.005" (0.127 mm) thick. Battery build cost breakdown: - 3 x LG 36V 4.4AH Hooverboard battery packs (for 60 salvaged new old stock LG MF1 cells) : 3 x 35.99 USD = 107.97 USD Source: "NEW LG 36V 4.4AH BATTERY PACK 18650 EBIKE VAPE POWERWALL BATTERIES 20 CELLS BMS" Capture.JPG Seller Alarmho...

As promessed... Pics of my battery

Docw009, If I was to change for a programmable controlle... Just out of curiosity, what do you think would be the max reasonable voltage/amperage I could push trough that small geared hub motor ? I know it's a matter of hills, how long you pull up that hill, the weight and other parameters.... But t...

I doubt you will blow the controller, but if you do, you can replace the LED unit and controller with a KT controller and LCD3 display for around 80-100 dollars. It will work with the brakes, throttle, and PAS sensor although you will have to figure the connectors. Where to put the battery on a fol...

Thanks Linux4kix. I'm a bit of a noob when it comes to controllers. I was hoping I could find a cheap chinese controller substitute. I dont mind having to change the connectors, as long as it can work out in the end with the same twist throttle, same LED display and PAS magnets. The thing is, I feel...

Guess nobody has an answer for the controller question I'm wondering about. Went trough the effort of drawing the whole wiring harness of the bike to make it clear what it needs to be able to hande... Will open a specific thread about my specific controller question soon as it does not seem to be vi...