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Inverter and BOS Development Performing Organization: Sandia National Laboratories Key Technical Contact: Ward Bower, 505-844-5206, wibower@sandia.gov DOE HQ Technology Manager: Dan Ton, 202-586-4618, dan.ton@hq.doe.gov FY 2004 Budget: $1,655K _____________________________________________________________________________________ Objectives • Improve inverter reliability and performance for PV applications to include: o Mean time before failure of >10 years o Efficiency >94% o Cost less than $.90/watt o Providing modularity and expandability to function with energy sources o Meeting UL 1741 safety and listing requirements o Meeting FCC Part 15, Class B for electromagnetic emanation requirements o Meeting National Electric Code (NEC®) requirements o Designing for high-volume production. • Improve and establish future inverter and BOS designs that allow full system integration levels while maintaining operating window flexibility. • Influence certifications, standards, and codes through technology development and verification and through technical guidance enabled by testing and benchmarking. Accomplishments • Phase II contract with General Electric Global Research resulted in a 3500-W utility-interactive, multiple-input inverter with a 12-year-minimum MTBF. The inverter addresses many lifetime- related issues and may be vertically integrated in GE’s new PV ventures. Delivery of the prototype to SNL is scheduled for early December 2004. • Phase II contract with Xantrex Technologies, Inc., resulted in a 5000-W utility-interactive or stand-alone inverter with optional inputs (including a matching maximum-power-point tracker) and a 10-year-minimum MTBF. The inverter addresses many lifetime-related issues and may be integrated into a system assembly. Delivery of the prototype to SNL is scheduled for early November 2004. • Phase II contract with SatCon Applied Technologies resulted in a 2500-W utility-interactive inverter with flexibility for inputs and a 12-year-minimum MTBF. The inverter addresses many lifetime-related issues and may be integrated into a system assembly. Delivery of the prototype to SNL is scheduled for early December 2004. • All manufacturers are working to assure UL listing, quality control programs, and highly accelerated lifetime testing. Future Directions • The number of high-reliability contractors will be reduced from three to two as Phase III of the high-reliability inverter initiative moves to the manufacturability and final product definition stages. The two “highest probability of success” winners will be determined via a Phase II review and with test results from the Phase II prototypes delivered to SNL. • Benchmarking and hardware characterization will play an increasingly important role in finalizing the high-reliability inverter initiative with specialized environmental and stress testingPDF Image | FY 2004 ANNUAL REPORT DOE Solar
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