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Sanity check!! Fan controller question

post #1 of 7
Thread Starter 
So I'm in the process of wiring up 17 fans in my sig build. They are all GT AP-15's. When I first was planning out a build, I read a few posts that these fans run just shy of 1w per fan. I decided to pair them with a Rheosmart 6 FC that says it pushes 30w per channel.

That tells me if I wanted to, I could push all 17 fans off 1 channel and still have room to go.


So now three months later, I'm at the stage to start wiring things up, and now I'm wondering if I'm not missing something here. My plan is to have 9 fans on one channel, 8 fans on a 2nd channel, 2 35x pumps on a third and fourth channels (or may just let them go full force on their own) and then misc led's on the other channels.

On paper, I should have enough watts per channel to accomplish this, but for whatever reason now I'm 2nd guessing it. The FC is powered by a single 4 pin molex - could it really power all that through the FC?

Can someone tell me if I'm missing something or should this work as planned?

Thanks
post #2 of 7
The standard spec'ed molex connector is supposed to handle 11A per pin (which means 132w on 12v). That's a good amount of power but you're right about questioning the FC pushing that entire amount. It's likely to not be able to as a matter of fact. When they say 30W per channel they mean that any single channel by itself is capable of driving a 30W device, but I don't recall ever seeing a fan controller where they advertise all of them going at the same time (180w for a 6 channel).
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post #3 of 7
The AP-15's are 4.3w (0.36 amp) on startup, it's only a short burst but they will all start at the same time. The pumps will be the same (higher draw at startup), have you factored that in also?
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post #4 of 7
Thread Starter 
Thanks for the replies.

@Lemon - That is my concern, that It won't be able to support say 3-4 channels at 20w-30w and then only a few watts on the other two.

@Darren - I did not figure in the startup. So that would give me a max of 6-7 fans per channel. Not a big deal, I could split them up between 3 channels then.

That still leaves me with the question of can this FC handle pushing all that power at the same time. I can't be the only one to have run into this. I've seen numerous builds with 12-15+ fans, but I'm not sure what they used to control them all.

I don't want to risk frying something the first time I try to boot the system. I guess I could always buy a 2nd FC and spread things out a bit more.

Thoughts?
post #5 of 7
Quote:
Originally Posted by Bear907 View Post
Thanks for the replies.

@Lemon - That is my concern, that It won't be able to support say 3-4 channels at 20w-30w and then only a few watts on the other two.

@Darren - I did not figure in the startup. So that would give me a max of 6-7 fans per channel. Not a big deal, I could split them up between 3 channels then.

That still leaves me with the question of can this FC handle pushing all that power at the same time. I can't be the only one to have run into this. I've seen numerous builds with 12-15+ fans, but I'm not sure what they used to control them all.

I don't want to risk frying something the first time I try to boot the system. I guess I could always buy a 2nd FC and spread things out a bit more.

Thoughts?
It should handle a good amount of power, just don't try to run maxing out 30w on every single channel. Might I suggest breaking the fans up into regions, for example rear, front, top, radiator fans, pumps, etc. being controlled by single knobs depending on case region. Pumps can be run at full speed as they are usually unnoticable or very quiet. My mechanical hard drives are louder than my MCP350.

If you had 15 GTs total, depending where you put your fans you can balance them out pretty well. If you are using a 360 radiator, you can mount 6 fans in push-pull config and connect that to one knob as radiator control. Then you could have airflow fans and depending on different locations you could break them up that way.

Also, the MCP35x pumps have PWM capability, so you could power them directly via a molex and then PWM control them via the motherboard. Pump speed isn't something that would need to be changed often anyway. I forgot to ask if you were running them in a series or as separate loops.

Leds have very minimal power consumption and you should have no problem powering every single LED your case off of a single 30W rail. LED's draw around 30mA of current at around 3v. To factor with some headroom, calculating an LED using 30mA at 4v would be 0.12W per LED, or 250 LEDs per 30W channel. That should be more than enough.
Edited by LemonSlice - 7/14/11 at 9:45pm
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post #6 of 7
4 fans per channel and you should be ok.

edit: nvm thought u said you were using the fc4. 6 fans should be ok.

what i did with my setup with my push pull fans, each set of push pull is on its own channel. this way I can shut fans down completely if they are not needed. Of course this requires more channels on the controller. right now Im doing this on a fc-4, but I got an fc-8 incoming.
Edited by AliceInChains - 7/14/11 at 9:44pm
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post #7 of 7
Thread Starter 
Thanks for the replies.

It will be a single loop, and pumps run in serial - mainly for redundcy not the added flow. I had always planned on breaking the fans up into sections, but just top and bottom. It won't be an issue to break them up further into 3 or 4 sections. I think I have what I need.

Thanks for the assistance. +1
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