Recent content by CUDAcores89

Question says it all, how do I charge a 72v battery I am building? I am planning to build a 72v battery out of some samsung 20Q cells from power tool batteries that I got a really nice deal on locally, Only $1 per cell. Only issue now is how to charge it? Currently I run a 52v battery with no...

For me it depends on where i'm riding. If I'm riding downtown or in the city where there are lot's of cars, people, and other bikers, I would say probably around 20mph would be my maximum safest speed. Cars don't expect you to move really fast, even if my ebike looks nothing like a regular...

Hey folks, I need help finding a new controller as my old one died. Well what really happened is my Greentime 48-84v brushless controller makes a bunch of horrible vibrating noise on my hub motor now. So I believe that one of the phases is dead. I have a cheap $10 36-48v sensorless controller I...

bump

well I suppose the good news is I no longer rely on my bike for transportation anymore. I'm going to a different college and will be living in the dorm rooms so I can just walk everywhere on campus. This bike has now kind of just turned into a joyriding vehicle so stuff can break without me...

You probably live in an area where you can choose to do that. I live in Michigan, where everything here is cars, cars, cars and more cars (which is why my riding is nearly flat roads). As such there are few to no bike lanes here, so I have to at least make an attempt to keep up with traffic...

Motor is a 9C clone 9x6, 6 turn hub motor with 28mm stator and 0.5mm lams. Been running the motor at 52v 30A all day no problems as measured by my turnigy watt meter. I have two battery packs ready go to. One is a 52v 16AH 14S8P battery made from Samsung 20R 18650 cells and the second one is a...

Yeah that's exactley what I do, I take the entire lane when i'm riding. Yet they just make their way into the left lane and wizz right past me. Would love to know how to solve asshole drivers. What should I do with all my parts then like the 72v controller coming in and the FF? Install it or...

Okay so about the moped dude, leave him to himself. Makes sense, don't get involved with jerks. BUT, there actually IS a very practical reason for me to go 40mph at least for 2-3 miles every day on my commute. I rode this bike 32 miles a day round trip to and from my university. That's why...

First, let me add why I wanted to do this: I am currently trying to beat a guy in my area on a moped, who a few weeks ago absolutely smoked me. If I DO go to 3000w, it will only be for a few miles to beat him in the race, and this will probably occur on mostly flat ground. Most of the time, I...

In total, here is what i'm gonna do to this hub motor to try to eke 3kw out of it for my riding style: 1. Ferrofluid. Should be a given. 2. I cut up some 20x20x40mm (LxWxH) heatsinks and I plan to thermally glue these to the hub motor. 3 (this is the big one). I'm going to strap a 12v server...

Since I currently ride a cheap ebay hub motor, I am currently shopping for a bigger hub motor that can get me to 40mph. I currently weigh 150 pounds and my bike usually comes in at 50 pounds. My riding style is mostly flat road with occasional small hills between 0-1% grade. I currently run...

I had this idea today about how to cool my hub motor, but it sounds pretty stupid and I see several drawbacks, but I wanted to know what endless sphere thought. I currently run a 9x6 generic ebay hub motor at 1500w continuously and i'm trying to see if I can run this thing at 3000w. Nearly all...

Decided to add to this, But I will just say rear wheel drive all the way for high power systems. My first ever ebike was a 1000w front wheel kit and that thing had like no traction. Later I installed a tiny little 250w geared hub motor on the rear and the bike had WAAAY better traction. Maybe...

So in my journey now to take a "500w" ebay hub motor and run 3000w through it (motor did 1500w just fine with everything stock), I have decided I will need to upgrade my battery pack to 72v. The battery pack will be a 20S 8P 18650 battery pack made from tested power tool cells. On the hub...