72V to 500W motor

[Nick]

Is it possible to use the GM 500W 36V motor with 72V power supply and controller?

[biohazardman]

Don't imagine the skinny little wires going into the motor would like that.  The motors also seem to have some heat dissapation problems so you could toast the windings?  Not to say it would not werq but that it would have to be closely monitored to avoid damage.  They have lots of hill climbing torque at 48v and a top speed of 23+ MPH a safer voltage to run them.

[Nicobie]

bio man,

Didn't you once mention that you were going to try 60v thru one of those 500 watt motors. I was curious how it worked and what controller you are using with 48v batteries.

I'm running on 48v with a GM 48v controller and a 500 watt motor. As I have extra sla batteries I thought I might try 60v just to see what it was like but am afraid I'd fry the 48v controller. I thought it might be cool to have a switch that would add the extra battery for a temporary extra boost.

Nick

[biohazardman]

Yup but thought better of it after I had to stop and let the motor cool down a couple times on 48v while downtown a few days back.   Doubt I will try a higher voltage on the GM but I do have a BMC to abuse at higher voltages.  I am in the midst of trying to do so as well as fixing the GM at the moment. Then there is the C-Lite that needs some abuse also.  Way to much fun. 
If you want to try higher voltages just put some thicker wires on the motor and have a go at it.  The controller will need the LVC adjusted at minimum.  Seeing that it is just a modified 36v unit I would be wary of pushing it up to 72v. For what it's worth it is my opinion the controller is just not up to it but then again I am fairly new to this stuff myself. This is a learning experience for most of us so take it slow and easy to keep the magic smoke from getting out.

[Spacelander 1946]

Rod Dilkes @ev-power Australia has been testing some new HV controllers using 72V......He will be getting some soon though they would cost about $300.

[Leslie]

Rod Dilkes @ev-power Australia has been testing some new HV controllers using 72V......He will be getting some soon though they would cost about $300.

Im sure they will go well on some of the bigger motors he's messing with.  As you seem to see the future there at EV-Power Australia what is there rated wattage.

There is no reason why you cant use there controllers on a  mountain bike and limit the speed at the throttle in a simple mod or better still a fet gate mod, to make them legal, you will get some serious distance @ 72V 10ah lifepo4 on the cheap compared to the monsters he's selling..


Id still rather the 36 ah monsters hes selling..

http://www.ev-power.com.au/-Lithium-Ion-LiFePO4-Batteries-.html


At least he's testing them. 

[Spacelander 1946]

Belive it or not, his using the GM 500W hub motor with a HV controller and 72V Lifepo4's on his 3 wheeled MV Challange Cart (not bike!)

[Leslie]

Belive it or not, his using the GM 500W hub motor with a HV controller and 72V Lifepo4's on his 3 wheeled MV Challange Cart (not bike!)

I believe it, but what is the wattage rating on the controller?

[Spacelander 1946]

Buggered if I know...This is High Voltage up market controller (not a GM product) Best to email rod@evpower.com.au/ He can supply specs etc.....only the price is $300AUD. Cheers & good luck.

[Leslie]

Buggered if I know...This is High Voltage up market controller (not a GM product) Best to email rod@evpower.com.au/ He can supply specs etc.....only the price is $300AUD. Cheers & good luck.

Yes im ordering a second controller drom rod tonight, this one is going to be the proper job not the factory second im using now, Ill use this one on the wifes bike and use the factory second to build my bike and when its up and running get the better controller amd use the second as a back up,   Ill inquire about the 72volt then.

72volt! This sounds like the Crystalyte V2 Digital Controller 36v-72v 35amp one ive seen around. Not sure about the efficiency at lower voltages but the reliability wouldnt suffer at 48 volts.

Ive got a wicked project comming up restoring these Dyno chain drive brushed bikes for all my kids I want 36 volt controllers from Island Earth. Ill keep one at 24 volts for the younger kids, And I want to get some solar chargers happening soon as 5 bikes charging at 2 amps will start to cost money in electricty.

Lots to do.