Over voltage Q100 36V to 48V -- it's a good idea?

[toniovelo]

Hello everybody!

I've actually a front q100 36v in 328rpm with 36v bottle battery (10/20a bms) and i can run at 38km/h in 26".

I want now buy a new q100 for any second ebike, a rear q100 this time but i want more torque if possible. If i take a 24v q100 in 201 rpm @ 36v, i will have more torque and same max speed? Or for more torque and speed i must buy a 48v battery? Thanks. (sorry for my bad english)

 

[d8veh]

With a 48v battery, the 24v 201 rpm motor will try and run at 480 rpm, which is 60km/hr (no load). That's much too fast, so it'll be very inefficient and it'll quickly overheat. 36v will give you about 38km/hr. You'll need about 18 amps to get that speed.

 

[toniovelo]

With a 48v battery, the 24v 201 rpm motor will try and run at 480 rpm, which is 60km/hr (no load). That's much too fast, so it'll be very inefficient and it'll quickly overheat. 36v will give you about 38km/hr. You'll need about 18 amps to get that speed.

OK thanks!

And, if i keep my front q100 36v in 328rpm and i upgrade the battery with 48v 10ah li-ion + ku123 with only 1 of 2 shunts to limit at 15a, will i have a best climbing + more vmax or just more vmax? Thanks!

 

[d8veh]

And, if i keep my front q100 36v in 328rpm and i upgrade the battery with 48v 10ah li-ion + ku123 with only 1 of 2 shunts to limit at 15a, will i have a best climbing + more vmax or just more vmax? Thanks!

I think you'll have a melted motor. 48v will work with the 201 rpm version, but i think it'll be too much for 328 rpm. I won't be able to work in an efficient zone.

 

[toniovelo]

And, if i keep my front q100 36v in 328rpm and i upgrade the battery with 48v 10ah li-ion + ku123 with only 1 of 2 shunts to limit at 15a, will i have a best climbing + more vmax or just more vmax? Thanks!

I think you'll have a melted motor. 48v will work with the 201 rpm version, but i think it'll be too much for 328 rpm. I won't be able to work in an efficient zone.

OK, thank you! I think i will buy a bafang BPM for best climbing. the 48v 10ah liconm battery from bms battery is ok for BPM or no enough strong?

 

[Sunder]

And, if i keep my front q100 36v in 328rpm and i upgrade the battery with 48v 10ah li-ion + ku123 with only 1 of 2 shunts to limit at 15a, will i have a best climbing + more vmax or just more vmax? Thanks!

I think you'll have a melted motor. 48v will work with the 201 rpm version, but i think it'll be too much for 328 rpm. I won't be able to work in an efficient zone.

I'll let you know in 3 months or so. I just put a 328 with 14s (About 58v since I only charge to 4.1v per cell).

It has started drawing more amps, but has done about 20km so far without issue. I do pedal up hills though, and pulse it up longer hills to give it a little additional time to cool.

 

[toniovelo]

I've a second q100 (in 201 rpm, 36v version) with 36v battery. If i put a 48v battery, the torque will be ameliorate ??? 10% 20% 30%? thanks a lot

 

[d8veh]

The 201 rpm Q100 comes to life with 12S lipos (about 48v running) and 18 amps. You get a nice balance of speed and torque. the torque is more than with a 36v battery, so hill-climbing is much better. If you want to use a 48v battery, you might want to sick to 15amps. The torque will be more than with a 36v battery in the mid range, but on very steep hills, there won't be so much difference because the efficiency will be lower, and the motor will get hotter. It should be OK if you don't have steep hills or if you don't weigh too much (<80kg).

You can see the effect of voltage and current by using the simulator. Select the Q100 328 rpm motor, then a 15 amp custom controller and 10aH 24v custom battery to get the results for a 201 rpm Q100 with 36v and 15 amps. Increase the voltage to 32v to simulate the same motor with a 48v battery. If you want to see how the Q100H does, use 31v and 41v.

http://www.ebikes.ca/simulator/

 

[toniovelo]

Thanks for the informations!

To compare Q100 and Q100H on ebike.ca , how i must proceed? (To see the torque difference)

 

[friendly1uk]

I bought the motor Q100 350W 36V 328 RPM. With my 48V battery full charged (at 54.6V), in freewheel the motor gives 62Km/h!

I am using this motor (running with the 48V battery and controller KU123) since some months and all is working great!! -- please see here a blog message with pictures and details: http://www.massacriticapt.net/?q=node/1647

Wow. That is way more power than most people put in to them. As in this thread, most talk about 750w or as much as 1000w if your careful. This is 50% more on top.

 

[d8veh]

Thanks for the informations!

To compare Q100 and Q100H on ebike.ca , how i must proceed? (To see the torque difference)

It's not really correct to compare torque between the two motors on the simulator because it doesn't allow you to change the rpm of the motor, which is the main difference.

 

[Sunder]

I'll let you know in 3 months or so. I just put a 328 with 14s (About 58v since I only charge to 4.1v per cell).

It has started drawing more amps, but has done about 20km so far without issue. I do pedal up hills though, and pulse it up longer hills to give it a little additional time to cool.

After 500km, the 328 on 14s lipo is still going strong. It definitely gets warm, but as I'm babying it up hills, it's not burned out yet.

 

[toniovelo]

Hello!

I've the Q100 36V and really 260rpm from elifebike. I buy with it the elifebike controller 350w 9 mofsets. My vmax is 42 km/h and good torque for this little motor. The max amps is 17.5A with my 48v battery, this config is safe? Thanks!

 

[toniovelo]

up please!

 

[motomech]

I'm using that exact same controller on a Q100 CST and it mates very well. Very close to a sine-wave controller in terms of smoothness and silence.
Without a meter, I wasn't sure the combo was pulling the advertised rating. It feels more like a 15A controller to me.
Have you measured it @ 17.5 Amps?

 

[toniovelo]

I see 17.5A with my wattmeter. With your controller you have at...? My config is safe?

 

[motomech]

My battery is 11S Lipo, about 44V hot off the charger.
The motor is a "fast wind" 328 in a 24"wheel, which is harder for controller to "drive"than a slower wind.
The controller is in a bag and so far neither it, nor the motor gets hot, or even very warm.
FYI, the capacitors are 63V rated, so I think your combo is "safe".

 

[toniovelo]

I think in 36v, put 17.5 amps in a q100 is not a problem but in 48v it's a good question...

D8veh speak about that and i think he put 18 amps with 12s lipo combo. It's OK for him i suppose ?

 

[motomech]

It depends on how the motor is used. A rider could overheat the motor at 36V, if he or she pushed it up a very long, steep hill on a hot day.
It is this type of extreem usage that can overheat the motor. In fact, higher voltage is not necessarily a bad thing. It might help to maintain a higher speed up a hill, which keeps the motor in a more efficient power range. My experience is, a precursor to overheating the Q100 motor\controller combo can be the melting the cheap controller connectors. I always replace the battery and phase connectors with quality pieces. I use HobbyKing 4 mm bullets.
With the tiny Q100, another thing to take in consideration is the stress to the gears and clutch. On the front of my 2WD bike, I use an Infineon 20Amp controller on a standard "328" motor. When connected to 12S Lipo, I can feel\hear motor stress if full throttle is applied. So I use 10S and the motor is smooth.
One thing about 2WD with two mini-motors, is the power can be shared by both motors, or the driving motor can be "switched" between the two, lessening the strain on either of the motors.
I would say, the standard Q100 can accept 17.5 Amps @ 48 Volts for 95% of the use conditions.
It is all about the hills.

 

[toniovelo]

Good job, thanks a lot. I think like you. I live in a land with a lot of plains and a little hills but never long. So, i think my q100 can survive with 48v and 17.5A.

 

[toniovelo]

Good job, thanks a lot. I think like you. I live in a land with a lot of plains and a little hills but never long. So, i think my q100 can survive with 48v and 17.5A.

I've testing my Q100 (36V 260rpm @48v 17A) for 4kms flat road and always in vmax of 42km/h. The motor was very hot after, normal? Not normal? Safe? Not safe?

 

[motomech]

Not normal.
I can run my Q100 CST @ 12S Lipo (approx. 46 V) and 17A all day on the flats and the motor barely gets warm
And that is here in the desert.

 

[toniovelo]

OK but what is your vmax?