Wattage
Under 250W
250W to 400W
400W to 500W
500W to 600W
600W to 800W
800W to 1,000W
1000W to 1200W
Amperage
Under 4 mAh
4 mAh to 6 mAh
6 mAh to 8 mAh
8 mAh to 10 mAh
10 mAh to 12mAh
12 mAh to 15 mAh
15 mAh to 18 mAh
18 mAh to 20 mAh
1200W to 1500W
This is where I got all confused when I first bought my first board. I bought the 500 watt motor instead of the 200 watt Pipemaster board thinking it was gonna be more powerful. It was 500 Peak watts, not constant. Pissed me off so much but it was my fault for not knowing. I already knew peak versus constant power but didn't think to even question it when I bought it. I was excited to get it. Got it shipped next day air. It is not up to the store to tell me and educate me on peak and constant power. They even told me that. How can I expect to teach me for an hour on engineering of a skateboard. Its not their job.

Some of the smaller motors have more power than the bigger motors that have higher wattage so its hard to just go by wattage when trying to find the peak power. A big motor can have less rpms than a smaller motor that spins at a faster rpm because their is less mass but not as powerful but has the same top speed as the bigger motor.

The power of the electric skateboard is determined by the number of rpms the motor turns and by the amount of current that is going into the motor from the battery. Some motors are capable of going at high rpms but their battery isn't powerful enough to power it and only powers it maybe 75% of its motor capacity. Some motors claim they are super high rpms but never get that high because the battery is not powerful enough. Cheaper built motors either get too hot because their is too much power going into them or they don't get hot at all because the battery is not powerful enough.

Some batteries might power a motor at 3500 rpms each minute while another battery can power it at 5000 rpms a minute, that same motor. This is why I can't just base how good a motor is by its peak power.

Some people can't handle the torque of a brushed motor with super fast acceleration. If the peak power is too high and creates too much of a G force pushing you forward, it can throw me off the board. E-Glide, for example, has curved edges that you press into so it doesn't throw you off the board. It's that powerful.

Before you buy a board, its is good to know the constant and also the peak power. 
See my Constant Power page
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