Solar Tiles v Solar Panels: "Tiles, technically speaking, are photovoltaic cells that mimic traditional roof shingles. They first became commercially available in 2005; at that time, they were more expensive than panels, but recent market forces have driven down the cost, so now the prices are equivalent." - that's in the US, of course. | Century Roof & Solar
great passive solar design- I would plant row of deciduous trees in front of glass so that in the winter that could act as a giant trombe wall but be shaded to keep it cool in the summer. Trees that max out at 2 stories would allow south face 3rd level roof to accommodate panels!