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Welcome to Sunpower Inc.


Sunpower is the world leader in free-piston Stirling technology. Our reputation for producing reliable and efficient Stirling engines and cryocoolers is known world-wide.

Sunpower’s engineering services include prototype design, development and fabrication of free-piston Stirling engines. The CryoTel® line of cryocoolers has outstanding performance, manufacturing accuracy, and quality. We invite you to contact us for more information about our services or products.

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Stirling Convertor Sunpower’s Advanced Stirling Convertor (ASC) has been selected by NASA for integration in the Advanced Stirling Radioisotope Generator for potential space missions. The use of the ASC in space radioisotope power systems reduces the required mass of fuel by a factor of 4 compared to existing technology. Sunpower Space Advanced Stirling Convertor (ASC)


For over 10 years Sunpower’s M77 cryocooler has cooled Germanium detectors continuously aboard the RHESSI satellite to study solar flares. It was launched on February 5, 2002. Thanks to its longevity and the data the mission has provided the science community, RHESSI is continually one of NASA’s highest rated scientific missions. The original mission was planned for 6 months of study. Sunpower Space RHESSIRead More


Mission Downselect (NASA)

Sunpower’s ASC development, initially funded by NASA Glenn’s Small Business Innovative Research Program, began in 2001 to address the power conversion needs of future radioisotope power systems.. Sunpower Space Advanced Stirling Convertor (ASC)