No more wattage rating?

[Timpo]

As we know ebikes power is measured in W and that's what government organizations and manufactures have been using.

So the Shimano E8000 has been replaced by EP8. Here's what gets interesting.. they're no longer revealing W rating for their motors.
According to Grin Technologies in Canada, the 250W Bosch motor was actually generating well of 800W at peak.

Micah Toll also mentioned that government regulation on W rating is "terrible regulation" because the regulation never really specify what the W rating meant. (nominal, maximum or continuous)

So the manufactures would just rate it 250W, 500W or whatever so that it would look compliant but they typically do not reveal maximum rating since they would not want to mess around with the regulations.

Now, looks like manufactures are rating the motor by Nm, not W.
Since everyone knows that W rating is meaningless (because maximum W is almost always higher than rated W), manufactures are moving towards Nm.

But just because they decided to go by Nm, doesn't mean W will physically disappear. What do you think?

 

[Nutella]

All motors will be "rated" at 250w or 750w and will continue to increase in power. Nm and power are what sells for most people.

 

[PDoz]

As we know ebi EP8. Here's what gets interesting.. they're no longer revealing W rating for their motors.
According to Grin Technologies in Canada, the 250W Bosch motor was actually generating well of 800W at peak.

Micah Toll also mentioned that government regulation on W rating is "terrible regulation" because the regulation never really specify what the W rating meant. (nominal, maximum or continuous)

So the manufactures would just rate it 250W, 500W or whatever so that it would look compliant but they typically do not reveal maximum rating since they would not want to mess around with the regulations.

Now, looks like manufactures are rating the motor by Nm, not W.
Since everyone knows that W rating is meaningless (because maximum W is almost always higher than rated W), manufactures are moving towards Nm.

But just because they decided to go by Nm, doesn't mean W will physically disappear. What do you think?

BUT shimano DO rate the ep8 at 250 w - read the spec sheet on their website https://bike.shimano.com/en-AU/product/component/ep8-ep800/DU-EP800.html


We all know the whatever rating is about as meaningful as the emissions ratings for a VW , physics and advertising exist in different dimensions, and youtube presentations are as reliable as a pressure washed ebike that's outside warranty.

 

[Ken M]

This is why when Dr. Currie drafted the original HR727 federal ebike definition he defined a 750W nominal rating (knowing it was nebulous but would be OK with congress given he could say it's just 1hp). He then established a maximum drive system wattage above 20mph per the constraints so an ebike's top speed was going to remain within the traditional top speed of non-ebikes. That said no one seems to understand how good and simple this definition is and how the 3-class legislation was a huge step backwards - driven both by the auto industry and poor understanding by People for Bikes on what HR727 meant.

 

[tomjasz]