Not getting maximum wattage?

[Joelectric]

Hi All,

Got my first electric bike a couple of months ago and I am loving it, wish I had got one year's ago instead of humming and hawing.

The bike is a generic Chinese geared hub 500w rated motor, LCD3 display, with a 48v 11.6ah hailong battery. the controller I am led to believe is 22amps 9 mosfets (KT48ZWSRMT-YP23F) It's built into the hailong battery mount. I have attached on a picture of it.

I get about 23mph on it on a flat road (I am 95kg)
As it didn't take me long to find out power is addictive!

My question is, is my current being limited somewhere? I am only getting a max of about 830w peak (Steepest hills off road) with a full battery and this drops to about 720w as the battery depletes. Should I not be getting at least 1100w peak from it. (volts x current)
Any ideas

 

[dogman dan]

You are getting max watts. Watts max when load is at max,, that is, the throttle is maxed, but you are not moving yet.

Soon as that motor turns, it requires less watts and the motor will pull what it needs. You can give it more watts, but if you don't need it to make the motor go round, the motor will not draw it. You would get to that speed quicker with more watts.

increasing volts makes the motor capable of more fast rpm, increasing the watts it will draw when riding up a hill.

What you are seeing, is about right for what you have, because you are still moving up those hills, your max watts up those hills should be about 900w or less. And then as your battery voltage drops, its making the motor less hungry to speed up, lowering the watts it draws.


But you should see about 1100-1200 watts from it for a second or two, when you start up full throttle. If not, your controller may not be a 22 amps, but an 18 amps.

Upping the amps of the controller would also mean more power up those hills, but what you are pulling right now is ideal for not overheating anything, motor, controller, or drawing harder on the battery you have.

Leave it alone and be happy with it is my advice, until you are ready for expensive battery upgrades.


Your max speed indicates to me that most likely you have one of the less fast wound motors, likely a 7 turn, and that your battery is sagging under load enough to keep you from having 27 mph typical for that wind, in a 26" wheel. ( or is your wheel 26")

 

[kcuf]

man above spot on

applied things in ev world

learn important concepts

peak average nominal

voltage always changing

under various loads

similar variation power usage

enjoy

 

[Joelectric]

You are getting max watts. Watts max when load is at max,, that is, the throttle is maxed, but you are not moving yet.

Soon as that motor turns, it requires less watts and the motor will pull what it needs. You can give it more watts, but if you don't need it to make the motor go round, the motor will not draw it. You would get to that speed quicker with more watts.

increasing volts makes the motor capable of more fast rpm, increasing the watts it will draw when riding up a hill.

What you are seeing, is about right for what you have, because you are still moving up those hills, your max watts up those hills should be about 900w or less. And then as your battery voltage drops, its making the motor less hungry to speed up, lowering the watts it draws.


But you should see about 1100-1200 watts from it for a second or two, when you start up full throttle. If not, your controller may not be a 22 amps, but an 18 amps.

Upping the amps of the controller would also mean more power up those hills, but what you are pulling right now is ideal for not overheating anything, motor, controller, or drawing harder on the battery you have.

Leave it alone and be happy with it is my advice, until you are ready for expensive battery upgrades.


Your max speed indicates to me that most likely you have one of the less fast wound motors, likely a 7 turn, and that your battery is sagging under load enough to keep you from having 27 mph typical for that wind, in a 26" wheel. ( or is your wheel 26")

Cheers for the reply, the bike has a 27.5" wheel size. The max watt (displayed on the display)is never any higher than 830/40 , watts, even for a short burst. It can hold 830 watts though if the climb is severe, but I never hold it for longer than 30 seconds to save the motor.

 

[fechter]

If the motor never gets too hot, you can probably give it more current. Most controllers can be programmed or modified for more current. If the motor gets pretty warm at the end of a climb, then maybe best to leave it at that setting. Ultimately it's the motor temp that is the limiting factor.