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Cooling Fan Start-up Power?

post #1 of 22
Thread Starter 
Hey everyone as the Gentle Typhoons are out of stock well everywhere mad.gif I've been trying to pick a different fan, my problem is that I want to run push pull on a 480 Radiator and want to plug them into a Lamptron Touch controller so I can use the loop temp to manage the fan speed automatically. The issue comes in that to do this in as clean a way as possible I need to run 4 fans per channel on the controller, each channel is 30 watts. So does anyone know the exact formula that I can use to figure out what a fans start up Wattage is? I know that Volts x Amps gives me the watts but someone told me that the start up watts are like 4 times that ?? Any help would be awesome so that I can start the fan hunt biggrin.gif
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post #2 of 22
I think the startup Amps (and consequently Watts, voltage stays constant) varies from fan to fan. Maybe it's listed on the manufacturer's website?
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post #3 of 22
Thread Starter 
nope, most don't even list the watts at all just volts and amps but that gives you what you need to figure out the watts. I know that all fans at start up pull a bit more as they struggle to get moving from a dead stop, I just don't know how much more. Like I said someone told me they thought it was up to 4 times more so if a fan pulls 1.5 watts at start up if this is true it would for a second or two pull 6 watts. If anyone knows anything about this subject and would be willing to part with said info I'd really appreciate it biggrin.gif
Edited by WeirdHarold - 12/1/11 at 5:31pm
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post #4 of 22
Here is how I solved how many AP-15 you can connect to Lamptron FC5V2.

Lamptron FC5V2 Help

You need to scroll it down a bit.
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post #5 of 22
I wouldn't worry about start up power, but I don't trust most fan controller specs either if they are not software controlled. I would suggest just using the running consumption tested and keep the power level to 10 watts per channel. Even with heat sinks, 30 watts is really too much to dissipate passively. When I teated the Sunbeam rheosmart rated for 30 watts it failed at pwm controll on just an 18 watt pump and while manual controll worked it was much too hot for my liking. I wouldn't push more than 10 watts on it...not sure about Lamptron though.

Unfortunately the fan amperage specs are also not right. Yate loons for example say 0.3amp regardless of which model which is conservative.
    
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post #6 of 22
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post

I wouldn't worry about start up power, but I don't trust most fan controller specs either if they are not software controlled. I would suggest just using the running consumption tested and keep the power level to 10 watts per channel. Even with heat sinks, 30 watts is really too much to dissipate passively. When I teated the Sunbeam rheosmart rated for 30 watts it failed at pwm controll on just an 18 watt pump and while manual controll worked it was much too hot for my liking. I wouldn't push more than 10 watts on it...not sure about Lamptron though.

Unfortunately the fan amperage specs are also not right. Yate loons for example say 0.3amp regardless of which model which is conservative.

I looked at the Sunbeamtech controller you mention and yes it says it has 30 watts per channel but there are 2 reasons I would have laughed at that and not even bought it.

1- It's on the cheap side only $29.99 - $39.99 depending on the site.
2- if you look at the pic of the back of it, it only has 1 coil and 2 capacitors (see pic)?
245

However if you look at the back of the Lamptron Touch you'll see something very different Coils and Capacitors for every channel, however you can only see the coils in this pic as the capacitors are on the other side of that PCB:
245

But if you watch this video he will show you all the capacitors and so on and then you can see a huge difference between it and the Sunbeamtech one you mentioned:
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post #7 of 22
I had 6 San Ace fans, 2 of them on each fan header,rated @ 24W......---> all 3 fan headers blew up. Crosshair IV mobo
1 San Ace has 12V x 0.56A, thats almost 7W ......14W for two fans
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post #8 of 22
Thread Starter 
You never plug more than one fan into a motherboard header, they don't have any serious power behind them. In fact I go out of my way to plug as little as possible onto my motherboard to limit the amount of power being pulled through / from my motherboard.
Edited by WeirdHarold - 12/3/11 at 12:59am
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post #9 of 22
Unfortunately it looks the lamptron FETs don't have any sort of heatsinks. It does look higher in quality but I think the touch part and features are where most of the cost is going. It might PWM fed though which is better for heat but not as good for fan noise. I would just watch temps on the back side if you are planning to push high watt fans. Unless you built a custom waterblock to cool the FETs I think 30 watts is going to fry any resistance based controller. That is more heat that most chipset chips have to get rid of.

You might also consider 4 pin pwm fans if high power is needed. I think they are a little smoother in sound than a pwm controller on a 3 pin fan.

I just haven't had good luck with fan controllers and high watt fan load...tossed many of them in the trash after loosing channels and don't trust pushing rated specs at all. In testing you will notice that low volts is when controllers work their hardest, so who knows what voltage that 30w rating is good for.
Edited by Martinm210 - 12/2/11 at 10:29am
    
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post #10 of 22
Thread Starter 
That's the point of this thread so that I understand how the fans pull their power so that I can choose fans that pull the lowest possible power so that I can use the controller with no worries. I know someone on here that has this controller and he is running 4 GT AP-15's on one of the channels and has had no problems. So I know it's possible with low watt fans.

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