onix45:
When i have one fan connected the pins stay at 12v, when i have two its around 9V, when theres3 its at about 7.5V the strage thing is that the voltag seems to be slowly climbing up. for example when i have 2 fans the voltage starts at 9V but in about 15seconds its at 10V.
What you see is that the electrical resistance of the fan changes with RPM combined with initial friction.
this is a similar effect when you try to get a car rolling. You need to push hard to get from standstill to rolling,
but after it rolls it costs less energy to keep it rolling.