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.
The Grape Solar 100-Watt Polycrystalline PV Solar Panel uses high efficiency solar cells (approx. 16.8%) made from quality silicon material for high module conversion efficiency and long term output stability and reliability. Virtually maintenance free.