The corrugated medium and linerboard board are made of kraft containerboard, a paperboard material usually over 0.01 inches (0.25 mm) thick.
The panels contain cells made in China, Taiwan and, sometimes, Germany. Grape still plans to import inexpensive Chinese-made cells, and to buy Oregon-made inverters -- which convert direct current to alternating current -- for the panels it assembles in Eugene.
Solar Cells. Solar cells are small, square-shaped panel semiconductors made from silicon and other conductive materials, manufactured in thin film layers. When sunlight strikes a solar cell, chemical reactions release electrons, generating electric current.