![]() The problem is that you have to have sunlight. If you have sunlight available, solar is awesome because it’s free energy. Some spare bits and pieces from around the house come together to make a cheap, although somewhat low power, fan for the greenhouse.Two of the more popular designs are the pop can collector and screen absorber collector. They also offer a huge saving over equivalent commercially made collectors. They are easy to build, cheap to build, and offer a very quick payback on the cost of the materials to build them. DIY solar air heating collectors are one of the better solar projects.To create a basic series, connect the positive wire that extends from the first solar. ![]()
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