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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"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