How To Build A Solar Panel
how can i build a basic Solar Panel kit for my green house. I would like to use recovered materials?
Get a coil of 10mm copper pipe from a plumbers' merchant. Do not uncoil it and build a squat 'cold-frame' to enclose it. Paint the coil with black paint. Plumb one end to a small reservoir (and water supply) and the other to radiators(?) inside the greenhouse. The coil will heat up inside the frame and hot water will create convection flow in the coil. But a pump will improve the flow if you can get one driven by solar/wind power.