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Originally Posted by HammerSandwich
MH, your first calc assumes constant current, which is not how a resistor behaves. Cut the voltage in half, and the current drops in half also, resulting in 1/4 power.
Aerodynamic power is the cube of speed, but that doesn't seem to match these switching fans. I just measured a Yate Loon 120. Feeding it 6V instead of 12 reduced the current by half. So that matches the resistor model nicely. Not matching the aero power calc is not intuitive for me. Do you need a scope to measure these switching motors properly?
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Maximum current draw is 1000mA per fan header.
so if my fans follow the same principal as yours the power drawn would be about 13 watts.
about 1 watt over thee recomended feed.
but there are 3 outputs on the MX212 and i have 4 fans to control.
looks like i may not be able to use the MX212 for the fans
I don't have acccess to a scope. i suppose i could go buy an amp meter. but after i get these measurments i would probably not uese it again...( i have hade a Multimeter for voltage checks and continuity for a few years and never needed anything more untill now)
One option wich i will now try is email teh manufacture and C if they can give me the values acurately... but from past emxperience that sometimes takes weeks before getting a reply.
I guess one option would be to use
mCubed T-Balancer
4 fan headers @ 15 Watts each...