Hello all,
I have a battery box that I am ventilating with a 12v PWM fan (salvaged form an old PC). I am powering this fan directly with a 10 watt 12v panel, using the fan ground and positive wires and leaving the green and blue wires disconnected. It worked great at first, spinning the fan up to full speed under good sun. The trouble started with clouds obstructed the panel and the fan diminished speed to idle, when the clouds cleared the fan remained at idle. If I disconnect the fan and reconnect, or momentarily obstruct (completely) the solar panel, the fan will resume full speed operation.
I presume there is a controller in the fan that is unhappy and causing this. Any way to prevent it from locking up in idle mode? I know I could simply use a non PWM fan but this seems like a decent fan and would rather not spend the money if I can make this setup work.
Thanks in advance all.