OverVolting a 48v 1000w motor with 96v 10ah battery....

[trophix]

Hey everyone,

I overvolted my 48v motor with a 96v 10ah lipo batteries hooked to a 72v 1500w 42a controller. My max speed is Only 44mph, how could I increase my speed to 50+ mph?

Do I need to increase my amps on my controller or the capacity on my batteries?

I'd really appreciated the help, thank you.

 

[e-beach]

Hey everyone,

I overvolted my 48v motor with a 96v 10ah lipo batteries hooked to a 72v 1500w 42a controller. My max speed is Only 44mph, how could I increase my speed to 50+ mph?

Well, that is a long story. Basically, volts = speed. Amps = torque. And watch out for stator saturation. Other items to check are the obvious, such as: How heavy are you and the bike, are you riding on flats or hills, what is your head wind like, are you on an aerodynamic bike, are you pedaling?

Do I need to increase my amps on my controller or the capacity on my batteries?

Capacity ='s amp hours ='s range. It is not equal to discharge capacity. If you want to go fast build a battery with high voltage (like 72v) and a high C rating, combine it with a controller that can handle a high amp out put (higher then 42a) and know that your 48v motor will at some point be over saturated and quite going faster then you want.

IMO get a controller that can handle more then 42a.

Just make sure that bicycle doesn't disintegrate while you are riding it at high speed. After all, it is a bicycle not a motorcycle.

 

[trophix]

Hey everyone,

I overvolted my 48v motor with a 96v 10ah lipo batteries hooked to a 72v 1500w 42a controller. My max speed is Only 44mph, how could I increase my speed to 50+ mph?

Well, that is a long story. Basically, volts = speed. Amps = torque. And watch out for stator saturation. Other items to check are the obvious, such as: How heavy are you and the bike, are you riding on flats or hills, what is your head wind like, are you on an aerodynamic bike, are you pedaling?

Do I need to increase my amps on my controller or the capacity on my batteries?

Capacity ='s amp hours ='s range. It is not equal to discharge capacity. If you want to go fast build a battery with high voltage (like 72v) and a high C rating, combine it with a controller that can handle a high amp out put (higher then 42a) and know that your 48v motor will at some point be over saturated and quite going faster then you want.

IMO get a controller that can handle more then 42a.

Just make sure that bicycle doesn't disintegrate while you are riding it at high speed. After all, it is a bicycle not a motorcycle.

Hey e-beach,

I only weigh 165 and I'm riding on flat surface with just standard frame bike. There is no wind and I'm pedaling as well.

I have a battery with higher voltage it has two 18s lipos with two 4s(10C in each pack) and five 3s(10c in each pack) connected together in series hooked up to the other pack in parrel giving me 96v 10ah which is more than 72v but I'm not seeing any high speed... I just recently bough this higher amp'd 72v 42amp controller. I was wondering instead of buying another higher amp controller, is it possible to do a shunt mod on this and increase the amps? If so, how will I go about doing that?

Also, how much more could I push this motor in speed without burning it?

Thank you for the reply.

 

[e-beach]

...... I was wondering instead of buying another higher amp controller, is it possible to do a shunt mod on this and increase the amps? If so, how will I go about doing that?

If you want to mod, have at it, but beware the consequences of pushing your components past what they are designed for. How fast? Who knows, with all the stuff that comes out of China, there is no way of telling once you start to mod for speed.

Check this out. https://endless-sphere.com/forums/viewtopic.php?t=31643

 

[E-HP]

Hey everyone,

I overvolted my 48v motor with a 96v 10ah lipo batteries hooked to a 72v 1500w 42a controller. My max speed is Only 44mph, how could I increase my speed to 50+ mph?

Do I need to increase my amps on my controller or the capacity on my batteries?

I'd really appreciated the help, thank you.

Just thinking out loud here; I'm sure there are some physics or engineering experts that can confirm, correct, or reject my (over simplified) train of thought.

The relationship between voltage and speed is only linear at "no load", so doubling the voltage is not going to double your bike's velocity, in large part due to aerodynamic resistance. That resistance is proportional to the square of velocity. The power overcome that resistance is proportional to the cube of velocity. So eight times more power required to double your bike's velocity. This is mechanical power.

Electric motors develop maximum power at around 50% of the no load speed, and drops off on either side of that (parabolic curve, so it drops off sharply as it approached the no load speed). So, if you double your voltage, and no load speed, you need to look at the power curve to determine where in the range the power output is enough to overcome the aerodynamic resistance. Since this is electric power, you also have to take into account efficiency and the various opposing torques that develop as speed increases, so you know how much mechanical power is left.

At some point it may be more prudent to change the motor characteristics (i.e. different motor) than increasing the voltage to meet your goal, or be satisfied with 44 mph.

 

[perpetualman]

Hey everyone,

I overvolted my 48v motor with a 96v 10ah lipo batteries hooked to a 72v 1500w 42a controller. My max speed is Only 44mph, how could I increase my speed to 50+ mph?

Do I need to increase my amps on my controller or the capacity on my batteries?

I'd really appreciated the help, thank you.

best to use multiple batteries in parallel to provide proper current, and I recommend the 96 volt battery to obtain high speed. Also hub sinks and statorade for cooling. See

Realize that your controler has a maximum RPM setting and telling the controller that you are using smaller wheels then you actually have and set the maximum speed to maximum

 

[nicobie]

If you are running 96V into a 72V rated controller expect it to fail pretty soon.