What speed could a 250 watt motor go?

[Jason Gadsby]

ok i am just curious, but using the figures from my granite pro (250 watt motor / 36v 10.4 amp battery) how fast and how long would it go if you unrestricted it, in other words how much is been held back?

 

[trex]

it depends on the controller. There is usually something on the controller's label saying how many Amps it will let through at most. Typically, for a 14A controller, you get about 20mph in ideal conditions.

 

[KirstinS]

It's a tricky one as it is not just the controller that restricts the speed but the motor windings themselves.

Looking online I'm guessing one of the bafang motors so you might get a couple of extra mph out with a change of controller (or derestriring by cutting the restrict loop (if there is one )

Or, do you have a lcd handlebar panel ? Or a basic led one

You can simply change the settings in the LCD ones sometimes in which case you can very easily find out

Edit - crossed with trex

 

[KirstinS]

Generally more amps gets more torque and more volts gets more speed.

Most 36v controllers can handle 44.4v so you can add a booster battery for added speed. There is always a risk of knack ring something though.

 

[hoppy]

ok i am just curious, but using the figures from my granite pro (250 watt motor / 36v 10.4 amp battery) how fast and how long would it go if you unrestricted it, in other words how much is been held back?

Interesting question! 36 volts and 14 amps give 504 watts, say 400 watts at the wheel.Similar to what Wiggo can sustain for an hour.He can average just over 30 mph for 1 hour.Most ebikes can only manage 20 mph with the same power. Down to the inefficient, aerodynamically, riding position, fat tyres,and weight. Big gains could be made in all three areas.

 

[KirstinS]

Interesting question! 36 volts and 14 amps give 504 watts, say 400 watts at the wheel.Similar to what Wiggo can sustain for an hour.He can average just over 30 mph for 1 hour.Most ebikes can only manage 20 mph with the same power. Down to the inefficient, aerodynamically, riding position, fat tyres,and weight. Big gains could be made in all three areas.

Interesting comparison but not really comparing like for like - at least doesn't appear so to me

. Wiggo can peak over 1500watts. The ebike can't. Plus wiggo puts it through the gears. A hub based ebike doesn't ( like op has)

Not to say tires, aerodynamics and position etc don't make a difference . They do of course

 

[hoppy]

Interesting comparison but not really comparing like for like - at least doesn't appear so to me

. Wiggo can peak over 1500watts. The ebike can't. Plus wiggo puts it through the gears. A hub based ebike doesn't ( like op has)

Not to say tires, aerodynamics and position etc don't make a difference . They do of course

Yes, sorry if my post not really relevant to OP! My point just that the 400 watts effective power most of us have available is enough for a genuine 30 mph if used efficiently.

 

[mfj197]

Yes, sorry if my post not really relevant to OP! My point just that the 400 watts effective power most of us have available is enough for a genuine 30 mph if used efficiently.

And a very good point it was too. I didn't know about the power output of professional time triallers like Wiggo but you're quite right - they sustain that sort of power for an hour, as do the climbers in the Tour de France. I know changing the tyres on my road bike can make a significant difference to the cruising speed, or to the effort required to maintain a specific speed.

Michael

 

[Artstu]

Whilst not dead accurate, the following comparison of me versus one of the top hill climbers in the country on the national hill climb hill this year has me at 579 watts, and him at 359 watts, he was 4 seconds faster in that particular comparison. Those are Strava estimated power figures.

 

[D8ve]

I would also have a high wattage. As it takes more to move a more ample gentleman than a racing snake.