A technician at AeroVironment's Design Development Center in Simi Valley, Calif., checks a panel of silicon solar cells for conductivity and voltage. The bi-facial cells, fabricated by SunPower, Inc., of Sunnyvale, Calif., are among 64,000 solar cells which have been installed on the Helios Prototype solar-powered aircraft.
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A technician at AeroVironment’s Design Development Center in Simi Valley, Calif., checks a panel of silicon solar cells for conductivity and voltage. The bi-facial cells, fabricated by SunPower, Inc., of Sunnyvale, Calif., are among 64,000 solar cells which have been installed on the Helios Prototype solar-powered aircraft to provide power to its 14 electric motors and operating systems.18 September, 2000NASA Photo / Tom Tschida› Helios Project Description