Endless Sphere

No direct experience, but a friction drive in a mountain bike application seems like asking for trouble.

I have a small amount of relevant experience, and you don't have a lot of replies at this point. I've used the Q100 as a front wheel assist with a tiny battery for a few years. have a little experience with a Nakto, and have just built up a BBSHD100. Is the q100 now available in cassette rather than...

Chinese shift sensor installed. Definitely made shifting worse. It cuts power when the cable moves, and instantly restores full power as soon as the cable stops moving, basically before the shift starts for upshifts, and definitely before it finishes for downshifts. When I pause pedaling, there is a...

Something I didn't see mentioned anywhere, at least with the 860C, holding the minus button is context dependent. When not moving, it activates walking mode, but when moving it activates pause mode, which allows you to shift without power, and then regain power after releasing the button and pausing...

Ended up buying a new bike and going with a BBSHD install.

I settled on the gravity monster for it's narrower frame with a bunch of successful fitments out there. I settled on the 100mm BBSHD based on reviews saying it fit this frame without drive side spacers. Mine is a 2021 20" frame. It doesn't clear without spacers. By eye, it looks like it needs a...

markz wrote: ↑

Oct 20 2020 3:59pm

You'd need to go mid drive because that bike has through axles.
BBSHD is a good mid drive

The bike I want to power is an old bike that has a 135mm rear dropout.

I want something to use in the woods only for fun. I'm usually that guy who knows stuff and wants to know more just for fun and is helping other people in the situation I find myself in now. Now I really just want to be reality checked by people who know way more than me on this one. What if I just ...

Yes, i mean the wires from the controller to the motor. I believe these are brushed motors. The 3 wires are heavy gauge red and black and then a lighter gauge light brown wire.

Quick, hopefully easy question... What is the 3rd wire for? I'm building an electric boat for my daughter and planning to use a trolling motor lower unit for assembly expedience.

I have a special (personal, not professional) project I need help with. I need a DC motor capable of very high torque for short bursts. Ideally, it should be capable of at least 6000w output for 3 seconds at perhaps 70% of no load speed. More watts would be much better. Duty cycle under these condit...

999zip999 wrote:They are on top of thundersky or calb type cells. What type or brand of cells you plan on using.

I was thinking Headway 38120HP.

Rocwander no worries. Welcome to the shark tank. I have seen single cell bms on top of bigger lifepo4 cells. Anything that achieves some degree of balancing without limiting discharge current or being very costly? Did it look anything like what I described above? I only need 4 cells worth, and with...

why come here and ask if you don't wanna listen to others advice. if you need a free yes man then you should get married. you never explained what the reverse parallel diode trick does. The important piece of any advice is to understand the why. That is where the value is. I understand why a BMS is...

He must be a Very Smart Guy to solve this Simple issue with zeners, transistors and resistors. I would be very happy to see this finally happen! :) The disconnect here, if any, has nothing to do with intelligence and everything to do with training and experience. This is far outside of my area of e...

How many cycles by now? I'm estimating 72 over the last 16 months. I stopped keeping track at 60. 59 was the day I broke my leg, April 19, 2013. Battery sat at ~75%SoC and room temperature until sometime in October, at which point the balance charge was similar to what it took when using it every d...

For this application (ice starter battery), charge and discharge must be the same terminals. I was thinking zener diodes in reverse parallel (with appropriate resisters to keep things from burning up). Waste a watt or so anytime an individual cell voltage is above 3.4v to keep things aimed at more i...

Update: 4.5 ah rated packs took 2.950 ah to fully charge last charge cycle, and 0.3 ah of that was balance charging. For this depth of discharge, that's about double the balancing required previously. At the start of the discharge cycle, all cell pairs were within the measurement resolution I have o...

I'm looking for an inexpensive solution for ensuring no cell in a 4s1p LiFePo4 pack gets overcharged when using a constant voltage series charger (14v). I don't care about over discharge protection, etc, and specifically do not want a discharge amp limit. Input?

So what happened to this project?

Silly question maybe, but I searched here after it wasn't clear on the BMSBattery site.... These controllers can be run throttle only, and do current control in proportion to throttle position, rather than voltage control, yes?

My goals match arbol's. I have not checked internal resistance yet. I rode my bike for the first time since I broke my leg in April just today. I left the pack in indoor storage, at roughly 75%SOC, and did nothing with it for 6 months. All cells read within my measurement error of the same today. mo...

90% discharged @ 3V resting voltage is pretty normal for lifepo4 pouches from my experience. can you do your internal resistance measurement using two different loads? measure the voltage and current at one current and then add a second load to it and measure the voltage and current there to determ...

I got fully charged cells to sag to 3v/cell at 2.5C (based on discharge capacity to 3.0v resting, which puts a "4500 mah" pack at about 4ah))

the thread bump reminded me to update this... We are evidently going to use arduino as an oscilloscope.