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post #1 of 3 (permalink) Old 05-23-2020, 10:19 PM - Thread Starter
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total power draw

Did a search and couldn't come up with anything. I know the fan terminals on the board are 1 amp supply. I have three corsair ML120 I was thinking about using off of one terminal. On the box they are listed as .219 amp power usage. For a 3x total of .657 amp draw and is well under the 1 amp supply. But what I want to know is that max amp required for each fan, or just an average 50% usage? I'm likely putting to much into this but I've learned that assuming can get pretty costly. They are pwm fans and I'd likely be running them about 50-60% power. Or should I just buy a powered hub and do that? My system is liquid cooled and the rad fans are running off powered hub since they draw more than an amp when connected 3 to a terminal. Anyway, let me know your thoughts. Appreciate any perspective. Like i said, likely reading too much into it and it's likely max draw listed. But better safe than the alternative.
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post #2 of 3 (permalink) Old 05-24-2020, 07:30 AM
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I would not run 3x 0.219amp rated fans on a fan header. That 0.219amp is run rating. At startup fans can draw about 3-5 times more for fraction of a second .. much longer if something gets stuck in impeller while motor has power. If you have ever heard of someone frying their fan headers or fan controller, it always happens when starting system.
Below is Nidec Servo Gentle Typhoon run and startup load ratings so you can see what I mean.
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post #3 of 3 (permalink) Old 05-24-2020, 12:25 PM - Thread Starter
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Quote: Originally Posted by doyll View Post
I would not run 3x 0.219amp rated fans on a fan header. That 0.219amp is run rating. At startup fans can draw about 3-5 times more for fraction of a second .. much longer if something gets stuck in impeller while motor has power. If you have ever heard of someone frying their fan headers or fan controller, it always happens when starting system.
Below is Nidec Servo Gentle Typhoon run and startup load ratings so you can see what I mean.

Thanks, that's exactly what I was thinking. That running it may only be .657 total amps, but the initial draw could be quite higher. Easy enough to correct. I'll pickup a fan hub and call it good. That way there's no doubt as to what could happen in the long run.
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