Originally Posted by FireCrow
So guys, does anyone know what would I need except the motor and batteries to make that sort of conversion?
The basic parts of a EV are still the same on a bicycle platform.
Motor + Controller + Battery + Charger
Just like other BEV projects ... you can spend a wide range of money depending on how much of the work you will do , how much you will pay for others to do for you, and what kind of performance you want.
Performance comes in multiple forms ...
Power : the more you want the more it costs.
Range : the more you want the more it costs.
Weight: The lighter you want the more it costs.
If you are just looking for the motor to give assistance and make your pedaling easier , but you still intend on pedaling all the time ... one of the smaller ~250 watt motors will probably be fine... the less work you want to do yourself the more you will need the motor to do for you.
An average occasional hobbyist bicyclist produces on average about ~100 Watts ... but the professional bicyclist can produce peaks of over 1,000 watts ... so there is a significant range in what different humans can put out on average vs peak loads.
This is effected by the amount of power you intend to consume ... more power needs more battery to run the same amount of time.
If you are only averaging about ~200 Watts of electric assist ... a ~100 WH battery pack ( Pack Volts x Pack Ah ) will give you that ~200 Watts for about ~25 Minutes ... averaging between 10 and 15 MPH ... that ~25 Minutes is more than the ~5 Miles you indicated.
Lighter Weight Parts cost more ... but the less it weighs the less power you need to move it as a given speed ... the less it weighs the more convenient it will be for handling the bicycle itself.
The Lightest I know of was a self made system HERE
complete with the bicycle he is under 13 kg total ... but there are issues ... which you can read about there.
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Kits are convenient because they match up all the parts for you ... but you pay a bit for that convenience ... you can save some money by doing it yourself ... and you can save some money if you can make the bicycle wheel for the hub motor instead of paying someone else for it ... etc ... .etc... the more work you farm out the more it costs ... but the more convenient it is.