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.
American-made vs imported panel costs. American-made solar panels generally cost from 80Â¢ to $1 per watt (W) â about 10-30Â¢ more per watt than imported panels. The highest quality, âpremiumâ American panels may even come in around $1.25/W.