Quote from: grotoc on June 05, 2018, 09:34:02 AM

Hi,

I have recently tried to put all my miners in server case, and in order to do it, I needed good fan in order to push some fresh air in it. I bought 100 x delta fans on alibaba from here : https://www.alibaba.com/product-detail/DELTA-QFR1212GHE-12-volt-dc-cooling_60637647291.html

But I must admit that was not a great move because the fans are dying one by one. Some work for several days, then they just stoped. For now, I've installed about 30 fans, and more that 10 fans are already dead (in a period of one month).

I'm thinking of bad quality fans, but they were supposed to be new Delta fans.
Another issue is that there are several scratches of the back of the fans, what make me think that they are not new, even if the plastic seems new.

The seller is telling me that the products are original and new, and if they stopped working it is because of a too high temperature. But in my case, the temperature of the room is about 30-40°C and I don't think it should be an issue.

What are your thoughts about that ? Do you have any serious seller on alibaba where I could buy another batch of fans ?

You sure that the voltage supplied isn't higher than +12V to those fans?

Delta is a good brand especially for industrial use, they shouldn't die this fast.

I am think your PSU might be overvolting and sending too much potential difference to your fans.

Maybe take a multi-meter and measure your voltage.