Electric bikes, bicycles and pedelecs

Even a circuit diagram might save this bike. It's mechanically and cosmetically fine, but needs electrical help. If you have a service manual, or can point me to one, I'll be very grateful.

Thanks!

This 24V SLA eBike is in fine shape, as long as I'm willing to pedal. I received it with the controller removed and wires dangling. It had a charge on receipt, and using a conventional resistance-based battery tester both batteries appear to be fine.

The donor said that the controller is bad, but inside was no burnt electronics smell, and all of the components looked correct with no singe marks.

I just bought an old 36V currie electro drive. I am new to wiring electric motors and need some help. I have it wired as this...

red and black (battery) to red and black (controller)

yellow and blue (controller) to red and black (motor)

I still have a red, green, black, pink, white, yellow and blue.

the throttle has a red black and green which i am assuming match with the wires coming from the controller but it was not working when i spliced them to their corresponding colors.

Hi, can anyone tell me if it's better to use a 48 volt controller on my 36 v 30 amp bicycle, the original one has gone up in smoke, it looks like the mosfets were not touching the heat sink properly, great site many thanks, James.

I have been looking at the electric bicycle handbook and want to improve it. I've made a first go at the main page whose intent is to give a high level overview.

I had previously done a lot of work on the history page but need to go back and integrate some more information I'd collected.

The idea I have is for that handbook area to be a decent quality introduction to electric bicycles, show some typical conversion and maintenance procedures, typical tools required, useful gadgets, etc.

Hey All, I'm an electrical engineer and I just recently opened a store to sell electric bicycle parts. Beyond just making a living though, I really want to educate and share information with people concerning eBikes. I think they are a much smarter way to get around a city and I'd really like to see this industry grow rapidly. I think it has the potential to ease a lot of the inter-city traffic problems that every major city experiences.

I've had an ebike now for about 2 weeks, and I'd like to take a minute to share some info for those out there who (like me) know next to nothing about ebikes.

There are brushed and brushless motors, do not(like me) buy a brushed motor kit from a guy on the back of a truck. It is not 1000W, and will not work for more than a day. An easy way to tell the difference is to count the wires going to the motor. 2=brushed more than 2=brushless.

Hi,

I'm experiencing an odd issue with my no-name brushed hub motor ebike. I was running it full throttle up hill and after about 2 minutes I noticed that in a single rotation of the wheel I was only getting power for about 20% of the rotation. When riding it will surge power on and off as the wheel rotates. What could be causing this partial failure? I'm mostly just trying to understand the problem, I've already decided this is not nearly enough power for me, but that's a separate posting ;-)

If I use a 350 watt controller (I have it laying around) with a 500watt motor.. Do I get a 350 watt motor output or do I burn up the controller.

I have a 250 watt hub motor... I haven't ridden it for a few weeks. I have been working on DIY Ebikes instead. So today I had a feeling I should test it. I checked that the battery was charged and off I went. It would not run at all. I came back and checked the power at the controller. 25.6 volts plenty of power for a 24volt system... The led on the throttle read low voltage. I am not sure what the problem is. Do any of you have an idea. Also if you know a fix I would sure be grateful. thanks charlie...