Range and mathematics, something does not add up

[ebikerr]

The Priority current has a 250W motor and a 500Wh battery.
The motor can do 500W peak I guess, but not sustained.

I am assuming at pedal assist 4, if I pedal with minimal wind at around 21-22mph we are talking 250W

So I should be getting 40 miles + range. Reduce 20% for efficiency and 30 miles+ is definitely possible.

But... I get around 20-25 with pedal assist 4, not even close to 30 miles. 30 miles is pedal assist 3 range. Is there a table which lists power output of motor at various assist levels?

 

[dodgeman]

I have a Bosch motor and similar sized battery on my Trek Verve+3. Trek has a range estimator on there web site, you may have to hunt to find it. I think if you click on a particular model of e bike you can find it. You can put in your weight, windy or calm, flat or hilly, the assist level etc. and it matches my range I actually experience accurately.

Mine is a class I bike so the boost cuts out at 20 mph but if it was unlocked I would expect a range similar to what you are getting. That fast speed is killing your range.

 

[mschwett]

The Priority current has a 250W motor and a 500Wh battery.
The motor can do 500W peak I guess, but not sustained.

I am assuming at pedal assist 4, if I pedal with minimal wind at around 21-22mph we are talking 250W

So I should be getting 40 miles + range. Reduce 20% for efficiency and 30 miles+ is definitely possible.

But... I get around 20-25 with pedal assist 4, not even close to 30 miles. 30 miles is pedal assist 3 range. Is there a table which lists power output of motor at various assist levels?

on a bike with an upright riding position, large tires, not particular aerodynamic or easy rolling, it takes more like 350-400 watts to go 21-22mph. corresponds to a battery draw of 440-500w, so range should be exactly what you’re seeing - a bit over an hour at 21-22mph is 20-25 miles.

motor power ratings are not too meaningful, what really matters is power draw, and of course how much power it takes to overcome drag and friction. (or gravity if uphill)

 

[ebikerr]

So if a motor is rated 250W, its actually putting out more than 250W? Its a pedal assist, I assuming I pedal hard and put in 100W or so, then motor is doing 250W only.

 

[fooferdoggie]

So if a motor is rated 250W, its actually putting out more than 250W? Its a pedal assist, I assuming I pedal hard and put in 100W or so, then motor is doing 250W only.

usually but you don't really know. I found out how much I have to put out for the bosch motor to hit its peak on long climbs. but how many watts is it doing? I know for short sprints it does more then long climbs. like I have to put out about 520 watts at 70roms to hit the peak on my trek.