Quote: Originally Posted by JBmorris
So 3 volts could possibly 50%/50% turn the fan but at slower speed?
Possibly but it's highly unlike you will find a fan that can start at 3v. 5-7v is usually about the lowest starting voltage you will find and that will be only in the highest quality fans. And, as A Guy said, it won't move very much air. You may need to use a DC to DC inverter to power a 12v fan but that would at least quadruple your 3v current draw.
I did a quickie search for 3v fans and didn't find much of anything. This outfit
sells 3.3v fans, which may work for you, but I don't know how reliable or safe the company is (my guess is not very).