Road Load and Range Calculation

Once the brake tests are completed, the road load tests are completed. The purpose of the road load test is to determine the power necessary to propel the ebike at various steady state speeds over a flat section of smooth asphalt. To do this, the assist is set to zero, or off, and ebike is pedaled at a steady speed over a flat section of asphalt in both directions. Typically, the ebike is pedaled at 5 mph in both directions, then 10, then 15, then, 20, then 25, and then finally, the top assisted speed, which is typically 28 mph.

Once the data is collected, the average pedal power is calculated for each speed. Efficiencies are then taken into account so losses from the battery through the controller and motor can be calculated. Finally, a battery wattage per speed chart can be made. Using the manufacturer’s published battery and amp-hour figures, one can then calculate the range for any given speed (for flat ground of course).

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