hub motor kit

[icecoombs]

Hello everyone,
I hope all is well with you and yours.
Help please, I need help picking out a rear hub motor kit. I previously had a daymak torino that was 36v 500w, it just did not have the speed nor torque to tow my 220 lbs around. I would like decent range 30+ km and maybe a top speed 50 or 60 kph. I have looked and there are just to many variables. I kind of would like a complete kit plug and play but I don't mind sourcing things separately. I would definitely need some guidance if I were to go the route of sourcing things separately. I just want to be able to jump on my bike and go. I am planning on using my existing 'Nirve Deviant" chopper bicycle. I am on a fixed income so my budget is fairly tight, although I have managed to squirrel away around 1,100 dollars. I can save more just not very likely before Christmas, like I stated previously I cannot afford to buy something only to find out it isn't what I need or wanted. I really appreciate your input and help, as such I would like to thank you in advance
cheers Coombs
:wink:

 

[dogman dan]

Well, you want a lot for a thou or so, but it's not impossible. What you really ought to do is lower your goal to closer to 45 kph. Then all you need is a 1000w 48v kit. Later on, you could modify the kit to go faster when you have mo money. 48v 15 ah will get you the range you want, at 40 kph.

The 40 mph club for cheap is done with a 72v 40 amps controller. Nearly any mid size direct drive motor can tolerate that 3000w max amps for a short run, say less than 10 miles. So find an affordable 1000w kit on ebay or whatever or cheaper still dig up a deal on a used motor. Then find the cheapest possible 72v 40 amps controller on ebay, cheapest including shipping that is.

Lastly is the tough one, a battery able to put out 3000w continuous. In general, to do that cheapest you go to Hobby King and find a deal on 20c rated RC lipo batteries. The minimum you can run the bike on is 4 of the 5s 5000mha packs. Each pack is about 18v 5 ah, so you'd get a 72v 5 ah pack by stringing them all together in series. 5 ah won't take you far, but it's a start. Bear in mind, cheapest price is not always cheapest per mile at all.

Along the way, you will need to make some minor modifications to the cheap motor. You will need to run thicker main power wires, the three phase wires. And installing a thermometer inside the motor is a very good idea. If you run wide open throttle for more than 8 miles, you can easily melt the motor. But if you limit yourself to 50 kph most of the time, you should be ok. Too long a hill can melt your motor very fast, if you try to charge it full throttle.

Lastly, read a lot about lipo before you choose the HK battery. It can easily burn your house or apartment down if you screw up. There are much safer alternatives, but not likely you can do them on a thou of budget and get something able to do 40 amps.

 

[dannyboyohyeah]

What is the terrain like, where you live? Mostly flat....some hills...lots of hills? That is quite a factor. I recently moved from a place with huge and many hills, to a nearly flat place. What a difference. I can go nearly twice the distance on 20ah. More than I actually need. I'm on the bike just about everyday.
This will also have a direct impact on your choice of motor.

 

[Drunkskunk]

What I read is you want to go fast and far for cheap. Pick 2. For that kind of budget, you can build a realiable bike that will handle the far and cheap, capable of 30km range if you'll accept 40kph as your top speed.