safe overvolting citycoco

[jojje123]

I have a 60v 1500W citycoco. I want to overvolt it.
At stock full power the hub motor is almost cold.
I have a 2000w 84v 45A controller (strange, but 84v 45A is 3780W) And I want to replace my 16s8p battery with a homebuilt 20s14p - 20s20p instead.
Is this safe? going to 84v but only 2000w
What is the biggest issues? the temperature? If I have full control of motortemp, controllertemp and batterytemp then it should be pretty safe to bridge controllers loadcontrol step by step with solder wire.
Goal is 84w 3000w safe if it is possible. and maybe over 40 mph (about 65 kmh)

 

[ZeroEm]

y jojje123 » Sep 11 2021 8:54am

I have a 60v 1500W citycoco. I want to overvolt it.
At stock full power the hub motor is almost cold.
I have a 2000w 84v 45A controller (strange, but 84v 45A is 3780W) And I want to replace my 16s8p battery with a homebuilt 20s14p - 20s20p instead.
Is this safe? going to 84v but only 2000w
What is the biggest issues? the temperature? If I have full control of motortemp, controllertemp and batterytemp then it should be pretty safe to bridge controllers loadcontrol step by step with solder wire.
Goal is 84w 3000w safe if it is possible. and maybe over 40 mph (about 65 kmh)

Raising the voltage is not a problem. If you keep watch on the temperature you can run what you want till it gets hot. Winter you can run more power and summer not as much.

The voltage is going to get more speed. That is not a problem in itself. As the speed increases it will take more amps to obtain and hold the speed. Amps is heat so as long as the motor can handle the amps your good to go.

You will not be at 84V, as soon as you hit the throttle it will drop to 83V, 82V, 81V. That is why they call it a 72V battery. I like to call them 74V, because most of my time is spent at higher voltages.

You will not spend much time at 3000w or 40 mph, your motor should over heat in 10 mins. You might get by at 35 mph and 2000w for a while. You really want to ride around at 40 mph you need a bigger motor or go to a 20" wheel.

All of this is a guess on my part don't know what bike, wheels, tires, riding style, hills, what motor you have or it's Kv.

 

[jojje123]

There is a big variation on these scooters. My son's first was a 1000w and it did about 38kmh fully charged. The second is a 1500w and make about 58kmh. the third is also 1500W but do 45 only. All on fully charged 60v (67.2v) 20Ah battery.
So I hope this scooter makes about 45kmh stock. Bought it defect without electronics and battery. That's why I want it to go faster than 60kmh or atleast same as his fastest and with a long range. 20s8p or something in the floor and 20s14p-20s20p under the seat on top of the floor. Maybe a total of 50-60Ah. My son has 2x20Ah 60v and I'm going to remake one of the batterys to 40Ah to him.

 

[ZeroEm]

by jojje123 » Sep 11 2021 12:23pm

There is a big variation on these scooters. My son's first was a 1000w and it did about 38kmh fully charged. The second is a 1500w and make about 58kmh. the third is also 1500W but do 45 only. All on fully charged 60v (67.2v) 20Ah battery.
So I hope this scooter makes about 45kmh stock. Bought it defect without electronics and battery. That's why I want it to go faster than 60kmh or atleast same as his fastest and with a long range. 20s8p or something in the floor and 20s14p-20s20p under the seat on top of the floor. Maybe a total of 50-60Ah. My son has 2x20Ah 60v and I'm going to remake one of the batterys to 40Ah to him.

Just watch the tempter. If it does not do what you want then up grade the motor.

 

[chuyskywalker]

My son's first was a 1000w and it did about 38kmh fully charged. The second is a 1500w and make about 58kmh. the third is also 1500W but do 45 only.

Wattage is a measure of power (volts x amps), not speed. Also, motor ratings in "watts" are almost all absolutely garbage. It's routine to run "250w" motors at a constant 500-750 with no issues. Some of the 2kw motors get pushed to 8kw with a little bit of statorade and fins. Hence the other poster's point about just watching the temps.

As for why the different wattage motors hit different speeds, since I've implied wattage is bunk, what actually matters is Kv (rpm per volt) of each individual motor. That value is what actually changes the topspeed of the bike.