Reddit reviews BAFANG 48V 500W Rear Hub Motor Kit Electric Bicycle Conversion Kit for Bikes 20" Wheel with 750C Display

We found 1 Reddit comments about BAFANG 48V 500W Rear Hub Motor Kit Electric Bicycle Conversion Kit for Bikes 20" Wheel with 750C Display. Here are the top ones, ranked by their Reddit score.

【Easy to Convert】 DIY rear wheel ebike conversion kit for bicycle with rear drop out size "128-148mm" flywheel is ≦9 Speeds. Easily convert your pedal bike into a motorized bike within 1-hour.【Stable Drive System】This Bafang rear-drive motor, which is compatible with the disc brake, has a rated power of 500W, providing ideal power for vehicles.【Complete Accessories】 Comes with all necessary accessories. rear wheel & motor, controller, brake level or brake sensor for hydraulic brake levers, thumb throttle, controller case,Bafang LCD display (optional),extension cable,PAS,1T4 cable,LED light as a free gift, battery and charger(optional)【Super Cost-Efficient】Strong and efficient, this motor greatly enhances riding comfort and is suitable for touring bikes, commuter bikes and mountain bikes. Speed up to 38-40 KMH, 470 RPM, efficiency ≥ 80%;Brake Levers cut off the power supply to the motor safely【Warranty & Free Duty】1-year warranty, 100% replacement or refund if there is any quality problem，North American Service Center (Tel: 702-202-8375), providing technical support and after-sales service ; Free Duty, it is the seller who bear the duty, the buyer do not need to pay the duty

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1 Reddit comment about BAFANG 48V 500W Rear Hub Motor Kit Electric Bicycle Conversion Kit for Bikes 20" Wheel with 750C Display:

u/bradland · 3 pointsr/ebikes

Energy on an ebike flows from the battery, through a controller, and into the motor. So in order to make sure everything works together you'll want to verify the following:

The voltage should match starting from the battery to the controller. Motors don't much care what voltage you send to them, as long as you stay under 72V (you will). At this low wattage, 36V is fine, but 48V batteries are more common these days.
Power is measured in watts, and watts are calculated using this simple formula: Volts * Amps = Watts. The symbol for each is V (volts), A (amps), and W (watts).
When looking at batteries, you'll see two numbers, usually like this: 36V 13.4Ah. The first is the voltage of the battery, and the second is the capacity measured in amp-hours (Ah). Amp hours are different than amps (A). Amp hours is literally amps over time, so a 13.4Ah battery could supply 1A for 13.4 hours, or 13.4A for 1 hour.
A third battery rating is called the discharge amperage. This is measured in amps and will have a continuous and a maximum rating. The continuous rating tells you how many amps the battery can supply continuously, while the max will tell you how many amps the battery can supply in short bursts. You want a battery that can supply about 20% more amps than you actually need. So using the formula for watts we talked about above, we can work out a hypothetical. Let's say you want to run a 250W motor at 500W. We work backwards through the math (yay algebra). 500W ÷ 36V = 13.888A. So you'd need ~14A from a 36V battery to supply 500W. Add in some overhead (for the battery's health) and you'll want to look for a battery with continuous discharge rating of 20A. These are pretty easy to find. If you decide to go with a 48V battery, the amperage requirement would be 500W ÷ 48V = 10.416A. Meaning you could get away with a 15A battery and controller. These requirements are really low, so it should be easy.
The controller regulates the speed of your bike by limiting the current drawn by the motor. Your controller's maximum amperage rating should never exceed the continuous discharge rating of your battery. This is where protection for your battery comes in. So in this same 500W scenario, you'd need a 20A controller. Again, easy to find.
For motor selection, what I'd do is simply by a 500W, then pick up a handful of 250W stickers and slap it on there over anything that says 500W.

To keep things really simple and easily serviceable, you could get a 500W Bafang rear hub kit. Bafang kits are ubiquitous, so parts are easy to find. Then buy a 48V jumbo shark battery from EM3ev. The base 14.3Ah model will work fine for your commute (which is really short).

As far as enforcement, you'll definitely want to heed the advice of anyone actually in AUS (I'm in the US), but enforcement tends to be more on action than on specification. For example, if you go blasting down a sidewalk full of pedestrians at 40 km/h, you're going to face a lot of scrutiny from the police. If you ride on the shoulder of the road at 40 km/h, no one is going to bat an eye. Just obey traffic laws and ride respectfully.