Electric bikes, bicycles and pedelecs

I bought an e-bike, the ignition caught fire and the owner sold it very cheap.
the rear wheel works but i cannot find any info on the bike or the hub motor.
all I know is that it was 36 volts (3 batteries)
this is the bike.

the rear wheel has no markings indicating what type of motor it is, but it looks like this one.

Whenever I turn on the main power switch (between the battery and the controller)
there is a small short-duration electrical arc created. Since this is probably
reducing the life of the switch, I'd like to prevent or reduce this arcing.

I was thinking of adding a secondary switch (SW2) in parallel with the main switch.
Where SW2 would use a 1k resistor in series to limit the inrush current.
Once SW2 was closed for a second or so then the main switch could be closed without arcing.

Comments? How have other people solved this problem?

Just came across this site - has daily information about the electric bicycle market in China. I've looked through alibaba.com enough times to have seen the dizzying array of electric bicycles and scooters available, and it's interesting to see so many pictures of so many shops where these are sold.

http://www.ebikesdaily.com/

I just got my nine continents ebike kit with a crystalyte controller (24V-72V, 20A) and my LiFePO4 48V 20Ah battery. To connect to the controller it looks like I'm going to have to put some matching anderson powerpole connectors on the battery out wires. Can't find this product anywhere in town (Victoria, BC) and it looks like you need to have the proper crimper + soldering equipment to make the connection. This the only thing stopping me from going out for my first ride with the kit installed.

hi,
i m a engineering student and making a project on electic bike . my budget is 125-150$.
can u please help me in finding the specification of the bike >

bike should take at least 750N load
what i want to know is for 10KM/hr speed what should be the
1 motor output
2 battery output
3 what value of kinetic friction the bike will face

PLEASE HELP !!!!!!!!!

I have been considering operating on my controller and installing a shunt so my ebike would climb and accelerate better. I do not want the shunt mod to be on all the time since travel distance is a factor for me. I was thinking of using a 30 amp relay that would switch using 12 volts to turn the shunt on and off. my ebikes motor is 48volts and 500watts. Any reason this wouldn't work?

Tired of driving the car, put 4000 miles/year on my HPVelotechnik Scorpion recumbent trike every year, but it just isn't practical to ride it with a trailer and heavy loads. Sold my Tour Easy and bought a Sun EZ3 AX delta trike, which sits higher and is easier to modify. Started off with a WE BL36 at 400w, added solar panels which, at best, offer 45w at 36v, or about 12% of what the WE hub uses.

I recently purchased a 48v 20ah battery from ebay. The seller was Leebenmr. The problem is that the seller did not include the BMS that was stated in the description. I will never buy another battery from this seller again. I have emailed him several times and he told me it was built inside the battery pack, I opened the pack and did not find the BMS. He wants me to send it back to give me a refund but i think its pointless because i will probably spend as much money in shipping than what i paid for it.

Hi everyone,

I've been doing a lot of reading the last month or so. I bought a 48v20ah LiFePO4 battery off ebay last night and I think I'm going to order a nine continents kit from ebikes.ca with upgraded controller to 72 volts. They offer a decent warranty and the motor on this kit sounds well-built.

I ordered the 650 watt kit direct from Cyclone Taiwan. It only took about 6 days to get here.

The motor and controller are marked as 24 volt, but Cyclone says that they can handle 36 volts. I assume that the motor is 500 watts at 24 volts and 650 watts at 36 volt.

I like it. Being able to use the rear cluster gears is great. I use the middle gears most of the time.