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.
Grape Solar 400-Watt Off Grid Solar Panel Kit. The next step up would be a 400-watt system, if you need to supply enough energy for beefier electronics, or you plan on having more than one person in your tiny house using small electronics at the same time. My recommendation is the Grape Solar 400-Watt Kit. Total wattage: 400 Price: $1399.99. Pros: