About e-bike's motor, what is the difference between 500W and 350W????

[Morgan bro]

Ready to buy electric bike! And see there are two kinds of motor 500W and 350W in the market! I would like to ask you guys:

1) 500W and 350W, which one is large power consumption in the same gentle road and driving the same speed.
2) 500W and 350W, which one can live longer?
3) After the battery discharge a 50% or less of power, about the endurance and climbing ability? 500W and 350W, which one is more stong?

 

[zippinaround]

Is this some kind of trick question?
1) 500 w
2) they can live just as long if maintained
3) 500 w will still be stronger because it's more powerful

 

[bakaneko]

1. Watt (W) or power is defined as in terms of e-bikes mass (rider, bike weight) and length, time (speed). The higher the W the faster the e-bike will take you. But, if you go the same speed on the 350W and 500W, it will consume the same power. Higher power also requires a better battery and controller

2. always go for the highest power you can get financially and legally. they both last the same

3. 500w is more powerful but maybe your question is more about the battery. there are two popular battery choices SLA and Lithium Polymer (LiPo4). while on paper both might have the same energy (amp hour), the difference is in the rated discharge rate. LiPo4 has a higher discharge rate which means you can go near 100% power and the discharge from the aH will be near constant. However, for SLA, the discharge rate for 100% power is dramatically higher and log or ^2, which means if you can go fast but not very far. Also, the LiPo4 is about 3-4 times as light, which matters. Never discharge your battery below 10-15%.

If you are buying a e-bike most likely it will come with a LiP04 battery, but check the discharge rate of the battery and manufacturer. You would want the rated discharge (not peak discharge) to be near the power (W) of your motor. This will allow you to push your bike to the max without worrying about harming your battery. China batteries are usually lower quality than Japanese (Panasonic). I'd go for 500w too.

 

[KB_UK]

1. Watt (W) or power is defined as in terms of e-bikes mass (rider, bike weight) and length, time (speed).

Watts have nothing to do with the mass of the bike or the rider, a Watt is always 1 Joule of energy per second. Can be a nuclear power station or a bicycle doesn't matter. 1W always = 1J/s

so:

1) Watt rating is a maximum, at full throttle. If both a 350w and 500w bike are travelling the same speed, with the same load, they use the same power.
2) They're the same.
3) If the battery can still deliver the correct current and voltage, the 500W. This is a matter of the battery.

 

[bakaneko]

Watts have nothing to do with the mass of the bike or the rider, a Watt is always 1 Joule of energy per second. Can be a nuclear power station or a bicycle doesn't matter. 1W always = 1J/s

yeah, i am just trying to relate it to his situation (bike and rider mass and speed). maybe, i am expressing it wrong but a watt is J / s = (N * m)/s or (kg * m^2)/s^3. Here I think kg is the rider + bike, m/s^2 is acceleration of the bike to some speed (velocity), and m is distance per second. i mean that a higher watt bike will be able to accelerate him to a higher speed than a lower watt system.

 

[Street Ryderz]

you guys are wack! the watt rating is not the max but the average constant! I use a 500w set up on 60v and its peak draw is over 1600w! When its running at speed within 20 percent of its free spin then it draws 500 w on average.And sla batteries have way less output amperage then li-po batteries my li-po cells will put out 225 amps constant no problem good luck getting even close to that with an sla!

 

[Street Ryderz]

Go use grin ebike simulator and look at the graph you can see everything and learn alot about how to get the most from your ride!

 

[Street Ryderz]

www.ebikes.ca/tools/simulator.html
Here is the site!

 

[bakaneko]

you guys are wack! the watt rating is not the max but the average constant! I use a 500w set up on 60v and its peak draw is over 1600w! When its running at speed within 20 percent of its free spin then it draws 500 w on average.And sla batteries have way less output amperage then li-po batteries my li-po cells will put out 225 amps constant no problem good luck getting even close to that with an sla!

yes, i heard that. i thought it ws closer to 1000w max on a 500w. but, it seems like you have a great bike.

 

[Street Ryderz]

My batteries only weigh 5 lbs huge difference from carring 60 plus lbs and all in weight is 80 lbs,and it uses a 45 amp controller witch is the real factor of how much power you ultimately get not the motor!