The solar powered fan
This project will require the use of photovoltaic cells, (or more commonly known as electrial or power solar panels) cable, switches and 12v motorised fan or fans, the fans may have to be made from various parts e.g. 12v motor, gearbox, housing, bearings, shaft and fan blades. How your design is made is up to you. Here is a basic idea and tips to help you get started.
Two 60w panels should be sufficient for an average sized classroom. Usually two fans will be required and a storage battery bank. Remember to house the batteries in a well ventilated cupboard. Because the system is running on 12 volts, don't run your cable more than 10 metres or excessive voltage drop will occur. Also use heavy copper cable to decrease line resistance. Consideration of switch types is necessary because you will need to control air speed.
Find out and discuss the disadvantages and advantages of using higher voltage. Inverting 12v DC or 24v DC to 110v AC, 220v AC or 240v AC.
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