To operate a single CPU fan, use one or two small solar panels designed for small electronics. Silica material collects solar energy and converts it into direct current, or DC electricity. The voltage is sent through a series of output wires and can be connected directly to the CPU fan or to a toggle switch for added convenience.
- Solar Panel - 6 Watt, 12 volt solar panel, Amazon or Ebay, $40
- Fan - 12 Volt, 0.25A CPU fan, $2-3
- Wires, from Walmart
See an example here: Solar Powered Chickie House Improvements - YouTube http://buff.ly/U94fua
Solar powered 12v computer fan in hoophouse - YouTube http://buff.ly/U93YHL
Attaching a Solar Panel to a CPU's Fan | Home Guides | SF Gate http://buff.ly/W2jSVA
How to Make A Solar Powered Fan - Instructables http://buff.ly/W2k1IG