Seattle: SolarWorld is expanding the product line it manufactures in the US to include polycrystalline PV panels.. SolarWorld has two vertically integrated West Coast factories in Hillsboro, Oregon, and Camarillo, California, capable of producing 500MW of panels annually, but ithas previously produced only monocrystalline silicon, wafers, cells and panels there.. The addition of US-made 230- and 240-watt polycrystalline panels gives customers a wider variety of choices that comply with the Buy American Act..