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

[morgan]

Well, you can get some decent speed and range @36V 360W with gear help.

Micargi 3-speed Rover with SBP electric kit, but a wimpy 36V 'bottle' battery.
Good for ~20 miles at ~22mph with no pedal help.

The motor and controller can take huge voltage and current, but will run even small power just fine.

My point is don't limit yourself to pressing the limits of your motor and controller as you never want to worry about adding more battery power like this example.

I had a big square 48V LI battery on hand slated for trike, but I shoved in this bike with same motor/controller in the above SBP e-bike parts 3-speed.

Electra 7-speed bike.
53V LI battery.
1680W 48V motor.
Programmable controller.
0~40 mph in ~10 seconds.
~40 mile range between charges.

It was too funny when the customer, a kid, took delivery.
Though he was warned to take it easy off the line he didn't get 10' before for flipping off the back from a wheelie.

He was geared up and didn't get hurt, but it was sure a wake-up call to him about how much instant power there was.

If 350W motor bike can ride on the beach normally?

 

[Street Ryderz]

Probably not!

 

[CrazyDan]

The beach is mostly flat ground, so it shouldn't have an issue at the beach for cruising speeds.

 

[Street Ryderz]

The beach is sand and if soft not hard packed like close to the water very hard to ride on with bicycle tires and therefore also hard on a low power electric drive!

 

[Morgan bro]

The beach is mostly flat ground, so it shouldn't have an issue at the beach for cruising speeds.

Make sense！So 500W motor can conquer the beach?

 

[Morgan bro]

The beach is sand and if soft not hard packed like close to the water very hard to ride on with bicycle tires and therefore also hard on a low power electric drive!

Have you ever tried?

 

[Street Ryderz]

Yes I have tried,and it doesn't work well at all!front tire gets hung up and digs in if you turn,rear tire see's extra load from trying to push thru !

 

[KCvale]

The beach is sand and if soft not hard packed like close to the water very hard to ride on with bicycle tires and therefore also hard on a low power electric drive!

Sand is like Mud, Water or Snow, you want to stay on top of it AND maintain control, and that takes power to compensate for the drag.

I am kinda proud of this build for what you looking for.

Just short of a Kilowatt to the shifting back wheel ;-}

 

[Guest-919500]

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.

Thank you great advise!

 

[Benchdweller]

150 watts