15 mile loop
I've been taking measurements from various battery supplies and EV configurations for around 4 years. The goal is to get a sense of the battery performance on different platforms. It's been very informative.
Each platform has its own characteristics for performance and of course uses different amounts of power over the same course of terrain.
Some of the bikes reach efficiencies as low as 12 watts per mile, making a 12 AH (~420 watt/hours) battery have a theoretical range of 35 miles. Most interesting is the value of performance of a platform vs. its consumption. Course surface has a big effect on the outcome. So one can say that these applications differ greatly but are all viable for transportation when cost and performance are seriously considered.
|chrg, dischrg, watts, time, miles, etc.|
One example of this is a 3.5 mile course with elevation change of ~900 feet can be completed by the EX1.AWFS(48volts) in 7:30 seconds with an ~speed of 27 miles/hour with a consumption under 80 watt/hours per mile. It's challenging for more powerful platforms to complete against this time even when using up to 150 -200 watt/hours per mile. So it can be theorized that a tight course, with complex turns and elevation changes is the limiting factor not the platform or power capabilities.
|Original EX1 ran at 36 volts.|
These observation do have implications when considering how much power is necessary for transportation on two wheel EVs. Do you need a 10Kw power system for commuting 30 miles when your max speed might only be 60 mph? What if your are ok with bike speed of 30 mph but may need power from 0 to 27 to snap on with some authority? The reality is 10Kw might not be enough for highway speed for some motorcyclists. But cycling is seen differently and is enjoyed by many casual enthusiast which is a big reason that e-bikes have such appeal. The transition from this enthusiasm to adoption of a new way to move from point A to point B is right around the corner as younger and younger people are being drawn in by the markets which now have expanded to many differing types of electric riding devices.
|3000W YMOTO Hub motor.|
In off road conditions or non standard surfaces, where in power distribution becomes an essential asset, consumption does go up considerably. Think of a bike leaving the road to take trail or pathway that is very narrow and not well marked or a very steep trail with some bumps. What a maintained road surface offers is a smother more effective rolling experience and more efficient energy consumption. Non-standard surfaces need more mitigation and there for throttle control and rapid changes in power, especially in surfaces with traction issues like sand or small pebbles. Ideally a commuter that had to travel many surfaces would have the power and flexibility to run high power when needed to deal with terrain changes and low power to keep an ideal speed for distance.