Reducing power drawn

[Psycosis]

There may be a simple answer to this question.

The controller is rated at 35amps, the battery 20amps, at its peak its pulling over 50amps. I am getting something overheating.
I originally thought it was the motor, but its seems more likely its going to be the controller. i guess it depends what it does with the extra power that was pulled from the battery.

If i buy a cycle analyst, i can limit the power that goes through the shunt/adapter connected to the cycleanalyst. As such i can then i assume limit the speed to 20mph. Does anyone know how i would wire this up.

If its simply enough to limit the power that can be drawn, is there a cheaper method rather than splashing out on a cycleanalyst.
What is the ultimate outcome if you limit the power that can be drawn from the battery to say 20amps, and the motor wants 40amps, does this just affect the speed, or does the motor become inefficient?

 

[NRG]

What motor do you have, voltage and W rating? The controller will supply whatever the motor is asking for up to the controllers maximum limits....as you are seeing 50amp peaks the controller is simply supplying this current to the motor as its the motor thats demanding it...

Cheaper than the CA would be a new controller limited to 20amp and rated for the correct voltage, 36v, 48v etc. As the ping battery you bought is 52+ volts on a fresh charge a 48v controller would suit rated for 20amps, thats a peak of 960w nominal...but we need to know what the motor is......

 

[Psycosis]

So the controller is rated at 36v 35amp max, i would have thought the controller cannot supply 50amps since it surpasses its own top limit.

The guy i bought it from said 900w. Looks like these must be 24w motors.
My motor looks like the one at the top, oddly they don't list anything above 650w

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I was told originally these were 36v, but it seems they aren't so slapped wrists for me. I did actually try to run it at 24v with my SLA batteries and it didn't do squat so i assume it was 36v.

 

[NRG]

They list a 900 and 960w kit at 36v, see:

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So you probably have the 60km one.

I also like the 250W sticker you can buy!

Anyhow, your controller is definitely supplying 50amps the Turnigy meter in your video clearly shows it. I'd drop them an email and see what they say, maybe its down to the voltage you are supplying it, a nominal 36v battery hot off the charger would be in the 41~42v region, yours is clearly way above that so probably a 48v battery.

Don't know if you intended that, over-volting a motor will make it spin faster and therefore raise your top speed.

 

[flecc]

These are Cyclone kits, the manufacturers website gives a lot of detail, the motors on this tab
.

 

[Psycosis]

Thanks Flecc,

i have looked at that but strangely my motor (or at least the motor i think i have) isn't listed. Since they don't label their motors properly its hard to know exactly what it is. I think it is a 36v motor however, so i guess that means at 48v its 1200w? Not sure if its as simple as that.

I will drop them an email. I have seem that these controllers for all kits are fundamentally the same, so it may be labelled 35amp but is rated a fair bit higher. Bit pointless if you need to limit the power.

NRG
I wasn't planning on going any faster i like the option but i definately don't want to go that quick on the way to work.

 

[NRG]

Just as well, you may get some strange looks from the local law enforcement agency!

 

[Psycosis]

I had an email back from Li Ping, he said its not the bms.
If it was the BMS i would have to unplug the controller to reset the BMS.

So most likely still the controller or battery.

I have a post from a guy on ES and he says he is running the same kit, with the a similar battery and just has the cooling fins on the motor and he has no issues.
It may be a simple solution to mess about and ride it very carefully to keep it within a certain range. It still doesn't address the peaks i am seeing however.