I am in the early testing stages of passive solar heat. This is the second time that I have made a heater. The first one is Here. This new one is much better built and is a good bit lighter with the use of polycarbonate instead of glass. The new model is still not done because I made some measurement errors. When I get things working as they should I will get the ebook out.
Check out the video here:
ebook not here just yet.