It appears that a descent on a 20 percent grade provides 2400 watts of assistance, and a descent of 30 percent provides 4500 watts of assistance.

https://www.gribble.org/cycling/power_v_speed.html

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- Thread starter figofspee
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It appears that a descent on a 20 percent grade provides 2400 watts of assistance, and a descent of 30 percent provides 4500 watts of assistance.

https://www.gribble.org/cycling/power_v_speed.html

Of course for e-bikes there's another huge variable which is the efficiency of the drive system. Most manufacturers ain't telling!

Your example is too simplistic; at single points you might be getting those numbers---you're not mentioning at what speed nor do we know at what weight (very important).

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Does it really matter how many watts you are producing going down? Isn't it more about the flats and ups and the amount the assist actually produces

Swiped from a Lennard Zinn article.....

Swiped from a Lennard Zinn article.....

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The naturally occurring wattage that gravity produces is 11 times the maximum output of an average mid-drive motor. There needs to be caps on this out of control power accessible to all riders.

"While an actual watt is an actual watt, There is NO SUCH THING as a "rated watt" or any standarized method for rating ebike motor power"

"When ebike companies talk about a motor power, there is no standard at all for whether this is a continuous power rating, a peak output power rating, or a peak input power rating, or something stamped on the product for legal compliance."

https://www.ebikes.ca/tools/trip-simulator.html

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