Fernando:
The answer to your solar panel question is quite simple. You want to figure out the declination of the sun at each solstice and then split the difference. Then your panel will be perpendicular to that angle. This is the way to have the best possible performance over the entire year. However, if you use the panel mostly for heat in the winter, you will want to tip it towards where the sun is in the winter, so that the maximum power is available when it is needed most. Figure out the declination when winter begins for you, as well as when winter ends for you, and then split that difference. The three panels could also be angled from right to left to provide an "array" effect so that one would be best in the morning, one for midday, and one for afternoon. I am not sure as to the angles, but the process would be similar to the one described above. Check with the solar panel manufacturer to find out for sure if this even matters. If the "straight" system builds up enough energy during the midday hours to carry through to the next day then the angling of the panels from right to left is not necessary. Jim Tallman, FX Studios.
