What does it all mean? There is a misconception of what watts do for you. Some people think that the higher the watts, the faster you will go or the farther you will go. Basically, your voltage, amperage and efficiency (quality) determine your speed and distance between charges. 
The formula for watts is, Amps X Volts = watts i.e. 36 volts x 12 amps = 432 watts. Your 450 watt motor should handle this very well, considering that only about 60% of the power generated by the amps x volts ever reach or is taken advantage by you motor.
The gage and the quality of the material of the wiring and connectors between the power source and the motor will increase the efficiency of the power generated, (using the power that you paid for).
Now here is the kicker, QUALITY. Generally, the quality of a brushless motor is defined by the characteristics of the casting design, material, the precision and the quality of the bearings and magnets.
High quality bearings reduce friction, vibration and therefore less wear and less resistance. The magnet quality is responsible for power (torque). This is what gets you moving from a dead stop, climbing a hill or facing a headwind. Since there are no moving parts in a brushless motor except the bearings, this is where the quality of the bearings really counts. There are some cheap motors manufactured with low quality bearings and magnets.
You need rare earth magnets or other quality magnets such as neodymium which are relatively expensive, plus quality bearings in the motor that you buy. Don’t be shy about asking your seller questions, check out his reputation and ask other bloggers about their experience with him.
The reality is, you get what you pay for. Buying quality once is usually cheaper than buying inferior products twice … or……. more.
Why would you want a high wattage rating? Due to amperage draw created by the hills or dead stop starts could cause your motor to overheat if it is underrated, and reduce the longevity and productivity of the motor, not to mention stealing the distance from your battery that you could travel. Having a higher rated motor also allows for increasing the voltage and amperage if you decide to do this later.
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Brenda
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